CSr

LtE in CMO #264

From Dr P Clay SHERROD

©. . . . . . . From: "Clay Sherrod" <sherrodc@ipa.net>

Sent: Monday, August 26, 2002 4:43 PM

Subject: ccdComets - ASO Comet Patrol August 26, 2002 UT

Four comets in spite of very bright moonlit skies; deep clear but moonlight certainly is affecting ccd measurements.

Complete observations of the ASO Sky Patrol for current comets is found at www.arksky.org, or the direct link at:

http://www.arksky.org/cgi-bin/comettable.pl

Comet 57P du Toit-Neujmin-Delporte:

*2002 Aug. 26.232 UT: m1 = 15.38ccd, Dia.= 8", DC = 2/9, ...0.3m

SCT/CCD...P.Clay Sherrod, (ASO, Conway, Arkansas) [Comet is now very small and difficult, though clearly diffuse with uniform coma; no condensation at all; strong moonlight to east]

Comet 29P Schwassmann-Wachmann:

*2002 Aug. 26.245 UT: m1 = 14.46ccd, Dia.= 22", DC = 5/9, ...0.3m

SCT/CCD...P.Clay Sherrod, (ASO, Conway, Arkansas) [Comet continues to demonstrate large and very irregular (perimeter) coma; some sign of central conds. but not as pronounced as on previous dates; very strong nearby gibbous moon likely affecting estimates]

Comet 92P Sanguin:

*2002 Aug. 26.296 UT: m1 = 14.24ccd, Dia.= 8", DC = 7/9, ...0.3m SCT/CCD...P.Clay Sherrod, (ASO, Conway, Arkansas) [Interesting view tonight with possible short broad tail or extension in PA 205 deg, some 18" length; coma is continued very compact and tight; very strong gibbous moonlight nearby]

Comet C/2002 O4 Hoenig:

*2002 Aug. 26.302 UT: m2* = 12.02ccd, Dia.= 0.8', DC = 7/9, ...0.3m SCT/CCD...P.Clay Sherrod, (ASO, Conway, Arkansas) [Very distinct and bright (*m2 = 12.02) nucleus clearly shown within uniformly diffuse round coma; m1 and detailed size estimates not reliable in gibbous moonlight; very distinct extension or short tail in PA 78deg. extends some 0.6'.]

©. . . . . . .From: "Clay Sherrod" <sherrodc@ipa.net>

Sent: Tuesday, August 27, 2002 2:45 PM

Subject: ccdComets - ASO Comet Patrol August 27, 2002 U.T.

Observations with rising strong gibbous moon to east; very clear skies.

Complete observations of the ASO Sky Patrol for current comets is found at www.arksky.org, or the direct link at:

http://www.arksky.org/cgi-bin/comettable.pl

---------------------------

Comet LINEAR - C2001 K5:

*2002 Aug. 27.173 UT: m1 = 14.68 ccd, Dia.= 9", DC =5/9, ...0.3m SCT/CCD...P.Clay Sherrod, (ASO, Conway, Arkansas) [Comet still exhibits a nice straight tail in PA 180 deg., about 0.7' length in spite of strong moonlight to E.]

Comet LINEAR - C/2000 WM 1:

*2002 Aug. 27.188 UT: m1 = 15.88 ccd, Dia.= 5", DC =7/9, ...0.3m SCT/CCD...P.Clay Sherrod, (ASO, Conway, Arkansas) [Comet is now a very tiny diffuse object, nearly stellar but showing nebulous nature; strong moonlight far to east]

Comet 92P Sanguin:

*2002 Aug. 27.222 UT: m1 = 14.50 ccd, Dia.= 10", DC =7/9, ...0.3m SCT/CCD...P.Clay Sherrod, (ASO, Conway, Arkansas) [Very interesting object, with highly concentrated coma increasing in intensity toward center with no distinct nucleus; quite round and compact]

Comet 57P du Toit-Neujmin-Delporte

*2002 Aug. 27.194 UT: m1 = 15.46 ccd, Dia.= 9", DC =4/9, ...0.3m SCT/CCD...P.Clay Sherrod, (ASO, Conway, Arkansas) [Fading quite fast and becoming a round and uniform faint object; little detail and difficult in moonlight]

Comet 29P Schwassmann-Wachmann:

*2002 Aug. 27.212 UT: m1 = 12.74 (*) ccd, Dia.= 1.1', DC =8/9, ...0.3m SCT/CCD...P.Clay Sherrod, (ASO, Conway, Arkansas) [Continuing to be interesting; there is a "knotty" appearance to the coma, with a condensation due S. of nucleus (*m2 = 15.31ccd), and another less bright knot SSE of primary nucleus; perimeter of coma is very irregular]

©. . . . . . .From: "Clay Sherrod" <sherrodc@ipa.net>

Sent: Wednesday, August 28, 2002 9:05 PM

Subject: ccdComets - C/2001 K5

Complete observations of the ASO Sky Patrol for current comets is found at www.arksky.org, or the direct link at:

http://www.arksky.org/cgi-bin/comettable.pl

Comet LINEAR - C2001 K5:

*2002 Aug. 28.129 UT: m1 =14.47 ccd, Dia.= 12", DC =5/9, ...0.3m SCT/CCD...P.Clay Sherrod, (ASO, Conway, Arkansas) [This small comet continues to be a consistently stable object, exhibiting a very fine and uniformly bright tail; very straight in PA 177 deg. for a span of 0.7'; also uniformity of coma is still maintained with perhaps a bit more central brightening at this time]

©. . . . . . .From: "Clay Sherrod" <sherrodc@ipa.net>

Sent: Friday, August 30, 2002 2:41 AM

Subject: Sept.19 Saturn Occultation

　Some of you may be interested in an exceptional opportunity to see Saturn pass in front of a relatively bright (10th magnitude) star; the central path of this occultation is taking it right across central Arkansas and points along the pathway, and at the ASO, Brian has posted a very fine article about the occultation, scientific results that can be obtained by monitoring this event and the rarity of it.

Complete details about the path, the timing and the research that ALL in this path can do is found at www.arksky.org and merely click on the reference to this article at the top of the page.

Note that it was with such a star occultation in 1977 that ground-based astronomers first found the elusive rings surrounding the planet Uranus....who knows what might be found still about Saturn?

From: FrankJ12@aol.com

Sent: Friday, August 30, 2002 2:06 PM

Subject: Re: Sept.19 Saturn Occultation

Dear Clay-

If the weather is clear for that morning on Sept. 19, I can image this occultation of a star by Saturn itself in methane light at 8900nm. When the condition is right, I can pick up a +10 magnitude star with a Celestron 8-inch.

At prime focus, it should be no problem. But higher magnification at f/20, I may have to an adaptive optics system and that it should be no problem too with longer time exposure. At this wavelength, I can image a +10

magnitude star right up to the limb.

Otherwise in normal light (without any filter), it would be washed out.

I will give it a try!

Regards,

Frank J Melillo

©. . . . . . .From: "Clay Sherrod" <sherrodc@ipa.net>

Sent: Friday, August 30, 2002 2:39 PM

Subject: ccdComets - ASO, August 30, 2002 UT

A few comets prior to quarter moonrise this morning....conditions not good for ccd with very heavy air and high haze, stellar limiting mag. at zenith = 17.1ccd.

Complete daily comet records (when available) are posted on the Comet Patrol Tables of the Arkansas Sky Observatory (ASO) at www.arksky.org .

Comet LINEAR C/2002 Q5: *2002 Aug. 30.198 UT: m1 = 16.35 ccd, Dia. = 9", DC = 2/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Comet is small but clearly diffuse and very open, no central condensation].

Comet 92P Sanguin:

*2002 Aug. 30.260 UT: m1 = 14.30 ccd, Dia. = 8", DC = 8/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [A remarkable small comet, all coma that is very tightly compressed and bright for its angular size; tiny starlike condensation possible at core]

Comet 57P du Toit-Neujmin-Delporte:

*2002 Aug. 30.245 UT: m1 = 16.07 ccd, Dia. = 9", DC = 4/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [This comet has faded dramatically over the past few days; it is very open and diffuse with perimeter nearly undefineable; high haze hampers measurements]

Comet 29P Schwassmann-Wachmann:

*2002 Aug. 30.253 UT: m1 = 14.28 ccd, Dia. = 16", DC = 7/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [High haze hampers observations but comet appears fainter and more difficult, with clear m2 (~15.6) nearly centered in very diffuse and irregular coma]

©. . . . . . .From: "Clay Sherrod" <sherrodc@ipa.net>

Sent: Tuesday, September 03, 2002 4:41 PM

Subject: ccdComets - ASO September 3, 2002 UT

Several comets from a fairly good morning/evening. Note that P/2002 O5 (NEAT) was imaged (image can be found at ASO link if not attached) and recorded quite brighter (mag. 15.08ccd) than predictions.

Complete daily comet records (when available) are posted on the Comet Patrol Tables of the Arkansas Sky Observatory (ASO) at www.arksky.org .

Comet LINEAR C/2002 Q5:

*2002 Sep 3.211 UT: m1 = 16.37 ccd, Dia. = 9", DC = 6/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Comet is small but clearly diffuse and very open, some central condensation, clearly nebulous in a very rich star field].

Comet LINEAR C/2000 WM1: *2002 Sep 3.142 UT: m1 = 16.08 ccd, Dia. = 0.8', DC = 2/9, .....0.3m

SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Very large, round and diffuse; nearly transparent with no condensation whatsoever; extremely difficult in ccd].

Comet NEAT P/2002 05:

*2002 Sep 3.170 UT: m1 = 15.08 ccd, Dia. = 12", DC = 5/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Most definitely active, with a very distinctive central condensation; much brighter than expected; possible short tail at PA 355, shows in ccd image]. - {image attached at above link} -

Comet LINEAR C/2001 K5:

*2002 Sep 3.128 UT: m1 = 14.45 ccd, Dia. = 11", DC = 6/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Comet continues a slow brightening; very fine object with distinctive tail centered at PA 178 degrees, stretching nearly 1.7' length].

Comet NEAT C/2002 K4:

*2002 Sep 3.204 UT: m1 = 16.84 ccd, Dia. = 7", DC = 639, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Very faint, nearly stellar and difficult, confirmed via 20-min. motion; some high haze at right at limit]

Comet 57P du Toit-Neujmin-Delporte:

*2002 Sep 3.239 UT: m1 = 15.89 ccd, Dia. = 12", DC = 3/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Continuing to fade rapidly; very difficult as coma is spread over a fairly wide area and is very vague at periphery, also very close (S.) of 16th mag. star]

Comet 92P Sanguin:

*2002 Sep 3.253 UT: m1 = 14.93 ccd, Dia. = 16", DC = 5/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Still a striking object, appearing much as a compact planetary nebula; center 1/3 appears strongly condensed with outer coma "halo-like"].

Comet 54P de Vico-Swift:

*2002 Sep 3.290 UT: m1 = 17.17 ccd, Dia. = 12", DC = 3/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Very difficult, nearly stellar, object verified only through three 20-minute interval motions; at limit with heavy moisture in air]

Comet 29P Schwassmann-Wachmann:

*2002 Sep 3.250UT: m1 = 14.77 * ccd, Dia. = 18", DC = 7/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Comet now exhibits a broad fanned tail from PA 40 to 320 deg; *m2 = 15.51, quite distinct]

©. . . . . . .From: "Clay Sherrod" <sherrodc@ipa.net>

Sent: Wednesday, September 04, 2002 9:15 AM

Subject: Re: [comets-ml] 54P Recovery ??

Hello Diego....I had forgotten about 54P being among the "lost comets." We did indeed image an object at the following position after confirming a slight motion over a 40-minute period. The details are following: (computer astrometric, not verified at this time):

Position at 2002 Sep. 03.290

RA 01 59m.236 / DEC +14 17m.103

Magnitude, ccd, unfiltered: 17.17

Stellar limiting magnitude: 18.7 ccd at zenith Elevation of comet was 39d 49m from east horizon and was subject to haze and moisture inversion An earlier suspected observation of a suspect object in the predicted (Harvard Observable Comets, latest update) was confirmed the following night to be a stationary stellar object.

Image URL is: (unprocessed patrol image....we do not enhance nor add any processing other than flat field and dark frame to our patrol images):

http://www.arksky.org/cgi-bin/cometlog.pl?request=54P_de_Vico-Swift

or www.arksky.org under the Comet Patrol tables "de Vico-Swift" first listing.

Under separate message I am sending the original jpg of this image.

I would be interested to know what you find out and thanks for writing.

----- Original Message -----

©. . . . . . .From: "Diego Rodriguez" <DRODRIG@santandersupernet.com>

To: "Comet English" <comets-ml@yahoogroups.com>

Cc: <Cometas_Obs@yahoogroups.com>; "Clay" <sherrodc@ipa.net>

Sent: Wednesday, September 04, 2002 2:27 AM

Subject: [comets-ml] 54P Recovery ??

Hello Clay:

54P/de Vico-Swift.

Francesco de Vico (Rome, Italy) discovered this telescopic comet during a routine search for comets on 1844 August 23.09. The comet passed 0.16 AU from Jupiter during 1968, which increased both the perihelion distance and orbital period. Subsequently, the most favorable apparition was not expected to be brighter than magnitude 18.

The comet has not been observed since.

I tried to observe 54P on the 30th Aug but could not CCDsee it.My image does not show the object in question .

I would like to ask the position of comet R.A. = ?Decl. =?

I have not measured the you frames yet.

Regards,

Diego Rodriguez.

********************************

Clay wrote:

Comet 54P de Vico-Swift:

*2002 Sep 01.292 UT: m1 = 15.74 ccd, Dia. = 14", DC = 2/9, .....0.3m

SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Comet is very open and diffuse, no central brightening nor unusual structure; conditions poor with

heavy moisture and rising moon]

Comet 54P de Vico-Swift:

Clay

----------------------------------------

Dr. P. Clay Sherrod

sherrodc@ipa.net

Arkansas Sky Observatory

www.arksky.org

*****************************************

The following tables list the date of the last astrometric observation reported to the Minor Planet Center (MPC)

This document was last updated on 2002 Sept. 1.80 UT

Designation Last obs. Mag. Code

2P/Encke 2002 08 29.39 20.2 T 291

6P/d'Arrest 2001 05 25.31 20.4 N 695

7P/Pons-Winnecke 2002 08 29.56 17.0 T 433

9P/Tempel 1 2000 12 29.08 18.0 T 735

19P/Borrelly 2002 06 11.90 17.6 T 213

22P/Kopff 2002 07 31.47 360

24P/Schaumasse 2001 07 23.47 360

28P/Neujmin 1 2002 08 21.02 844

29P/Schwassmann-Wachmann 1

2002 08 31.97 14.7 N 170

30P/Reinmuth 1 2001 11 20.59 867

32P/Comas Sola 1997 06 25.88 18.7 T 118

36P/Whipple 2002 08 26.30 18.5 T 644

39P/Oterma 2001 09 19.31 22.5 T 809

43P/Wolf-Harrington 1998 05 26.16 17.3 T 691

46P/Wirtanen 2002 08 20.76 349

49P/Arend-Rigaux 1999 05 14.21 20.0 T 704

53P/Van Biesbroeck 2002 04 15.19 19.6 T 704

54P/de Vico-Swift 1965 10 15.16 689

[Non-text portions of this message have been removed]

©. . . . . . .From: "Clay Sherrod" <sherrodc@ipa.net>

Sent: Wednesday, September 04, 2002 6:01 PM

Subject: ccdComets ASO, September 4, 2002 UT

Hello to all....a fine night in Arkansas....

NOTE: Normally I would have posted images on the Arkansas Sky website by this time; images will be posted where noted later in the day due to an unexpected personal emergency at this time.

- NOTE (details below): Comet C/2000 CT54 LINEAR - very nice brightening....(m1 = 14.6) Complete daily comet records (when available) are posted on the Comet Patrol Tables of the Arkansas Sky Observatory (ASO) at www.arksky.org .

Comet C/2000 CT54 LINEAR: (possible outburst/brightening)

*2002 Sep 4.295 UT: m1 = 14.69, Dia. = 8", DC = 2/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Comet is considerably brighter than expected (est. for date @ m1 17); very bright and diffuse coma with some degree of condensation; elongation (~10") in PA 135 deg.] - {image IS posted @ www.arksky.org } -

Comet 57P du Toit-Neujmin-Delporte:

*2002 Sep 04.223 UT: m1 = 15.21 ccd, Dia. = 11", DC = 3/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Comet is small but clearly diffuse and very open, no central condensation]

Comet C/1999 T1 McNaught-Hartley:

*2002 Sep 04.272 UT: m1 = 17.06 ccd, Dia. = 6", DC = 4/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Very small and diffuse, clearly nebulous among rich star field; very difficult in excellent and deep clear skies]

Comet C/2001 U6 LINEAR:

*2002 Sep 04.295 UT: m1 = 17.39ccd, Dia. = 8", DC = 2/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Nice oval diffuse patch, very difficult even in near-perfect transparency; small with no central condensation]

Comet 29P Schwassmann-Wachmann:

*2002 Sep 04.236 UT: m1 = 14.41 * ccd, Dia. = 22", DC = 7/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Very irregular but appearing smaller than on other nights in spite of excellent conditions; *m2 = 16.12 ccd] - {image will be posted later today on www.arksky.org } -

Comet 92P Sanguin:

*2002 Sep 04.252 UT: m1 = 13.69 ccd, Dia. = 14", DC = 6/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Continuing to demonstrate very concentrated and bright coma with distinct gradiant about 1/2 toward center]- {image will be posted later today on www.arksky.org } –

Sent: Wednesday, September 04, 2002 6:47 PM

Subject: possible confirm: Comet 54P de Vico-Swift images

Possible confirmation image of 54P posted......Two images, 25 min. apart demonstrating motion to suspected cometary object in position predicted for 54P de Vico-Swift with stellar reference object indexed in posted image:(image is raw and unprocessed, no enhancement, enlargement & quite grainy)

http://www.arksky.org/cgi-bin/cometlog.pl?request=54P_de_Vico-Swift

Data of object:

Comet 54P de Vico-Swift (suspected):

*2002 Sep 04.310 UT: m1 = ~17.2 ccd, Dia. = 9", DC = 2/9, .....0.3m SCT/CCD...P. Clay Sherrod (ASO, Conway, Arkansas) [Object is small but clearly diffuse and very open, no central condensation; motion clearly recorded in 25-min. interval; reference positional object noted in image].

Sent: Thursday, September 05, 2002 4:20 PM

Subject: ccdComets - ASO, Sept. 5, 2002 UT

A few morning comets before high haze moved in....note that magnitudes are now given to 0.1 per "popular demand." <g> 92P Sanguin

2002 SEP 5.289 UT: m1=14.3 (*m2 = 15.2), Dia.=19", DC = 8/9, ...0.31m SCT/ccd.......P. Clay Sherrod, ASO - Conway [[An incredibly compact coma, with a bright nucleus (*m2 = 15.2); comet is quite symmetrical and sharply defined at perimeter]]

C/2002 K4 (NEAT) 2002 SEP 5.260 UT: m1=17.1, Dia.=22", DC = 3/9, ...0.31m SCT/ccd.......P. Clay Sherrod, ASO - Conway [Large and diffuse, with irregular perimeter; very easy in dark skies.]

C/2002 Q5 (LINEAR) 2002 SEP 5.253 UT: m1=14.9, Dia.=28", DC = 3/9, ...0.31m SCT/ccd.......P. Clay Sherrod, ASO - Conway [Coma is definitely elongated in an E-W orientation; quite bright and easy; diffuse with considerable irregularity.] 29P Schwassmann-Wachmann

2002 SEP 5.233 UT: m1=~15, Dia.=20", DC = 3/9, ...0.31m

SCT/ccd.......P. Clay Sherrod, ASO - Conway [[Comet is too close to mag.

14.4 star to determine photometric value; very distinct fan shape still persists, from PA 358 deg to 35 deg; very little central conds]] 57P du Toit-Neujmin-Delporte

2002 SEP 5.212 UT: m1=15.6, Dia.=12", DC = 4/9, ...0.31m SCT/ccd.......P. Clay Sherrod, ASO - Conway [[Comet becoming fainter nightly and more diffuse; very slight central condensation seen; coma very round and uniform]]

Sent: Saturday, September 14, 2002 9:22 PM

Subject: ASO Jupiter Patrol - First Image of Apparition

Jupiter captured in dawn this morning, seeing fairly poor, but considerable interesting activity; First ASO image of 2002-2003 apparition, taken in strong dawn light. Note GRS and area immediately following appearing quite turbulent; dark but small barge near CM in central latitudes of NEB. Note that s. edge of SEB appears to be quite turbulent pr. GRS longitudes and also very bright NEX ovals, particularly that near the fol. limb (right) in this image....notable strong yellow coloration.

For those note having the image attached, it is found on the ASO Planetary Patrol link at www.arksky.org or directly at the link:

http://www.arksky.org/asoimg/jup0914_02.jpg

Sent: Wednesday, September 18, 2002 2:20 AM

Subject: Re: Sept.19 Saturn Occultation

Dear Sherrod and all-

I had mentioned earlier that I can image an upcoming occultation of a 10th magnitude star by Saturn in methane light this Thursday morning. I don't believe this is going to be successful fo me.

What's going to happen that the light from the Rings in methane light will completely overwhelm by time exposure in order to capture a 10th magnitude object right on Saturn's limb. It will be all washed out.

Lets see what happens!.

Regards,

Frank J Melillo

Sent: Wednesday, September 18, 2002 3:02 AM

Subject: Re: Sept.19 Saturn Occultation

Best of Luck, Frank....

The only way to know if it can or cannot be done is to try...it is indeed a difficult attempt due to the overwhelming brightness of Saturn's rings....but imaging in specific spectral regions may indeed prove

successful and valuable. Details for this upcoming event are posted by Brian S. at www.arksky.org.

Best of luck to all who give this their best shot!

Sent: Saturday, September 14, 2002 9:22 PM

Subject: ASO Jupiter Patrol - First Image of Apparition

Jupiter captured in dawn this morning, seeing fairly poor, but considerable interesting activity; First ASO image of 2002-2003 apparition, taken in strong dawn light. Note GRS and area immediately following appearing quite turbulent; dark but small barge near CM in central latitudes of NEB. Note that s. edge of SEB appears to be quite turbulent pr. GRS longitudes and also very bright NEX ovals, particularly that near the fol. limb (right) in this image....notable strong yellow coloration.

For those note having the image attached, it is found on the ASO Planetary Patrol link at www.arksky.org or directly at the link:

http://www.arksky.org/asoimg/jup0914_02.jpg

Subject: Re: Sept.19 Saturn Occultation

Dear Clay and all-

Did anybody observe an occultation this morning? No luck for me. I woke

up and it was too foggy or a lots of haze.

Regards,

Frank J Melillo

P Clay SHERROD (Arkansas, USA )

Arkansas Sky Observatory

sherrodc@ipa.net

http://www.arksky.org/

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