2001 Mars Observation Reports -- #04 --
OAA MARS SECTION
made during the period
from16 January 2001 (104°Ls) to 15 February 2001 (118°Ls)
based on the article published in CMO #240 (25 February 2001)
by Masatsugu MINAMI, Director of the OAA Mars Section
On 13 February, Mars attained the western quadrature, and we can now observe the planet at meridian at dawn. AKUTSU (Ak) joined. We hear MURAKAMI (Mk) also started and
This time we acknowledge receipt the observations from the following observers: We received the observation reports from the following ten observers while the angular diameter was still under 6 arcsecs.
AKUTSU, Tomio (Ak) Karasuyama,
1 Sets of CCD Images (10 February 2001)
f/60 32cm spec equipped with a Teleris 2
HERNANDEZ, Carlos (CHr)
1 Set of Drawings (11 February 2001)
410, 470x 20cm SCT
HIGA, Yasunobu (Hg)
9 Video images (19, 23 January; 6, 15 February 2001)
25cm F6.7 spec equipped with Sony VX-1000
ISHADOH, Hiroshi (Id)
4 Drawings (17 January; 5, 6 February 2001)
400, 530x 31cm speculum
MINAMI, Masatsugu (Mn)
26 Drawings (21, 30 January; 3, 4, 6, 8 February 2001)
400, 480x 20cm refractor*
MORITA, Yukio (Mo) Hatsuka-ichi,
15 Sets of CCD Images (21, 22 January; 2, 11 February 2001)
f/50 25cm spec equipped with an ST-5C
NAKAJIMA, Takashi (Nj)
6 Drawings (4, 8 February 2001) 480x 20cm refractor*
PARKER, Donald C (DPk)
10 Sets of CCD Images (16, 28, 31 January; 8, 14 February 2001)
f/55 41cm speculum equipped with a Lynxx PC
1 Set of Drawings (26 January 2001) 445,610x 41cm speculum
A (DPc) King's Lynn,
3 Sets of Drawings (16 January; 13, 14 February 2001)
410,590x 31cm Meade SCT
Myron E (MWs) VA,
2 Drawings (24, 28 January 2001)
360x 32cm speculum / 430x 15cm refractor
16 January ~ 31 January 2001
On 17 Jan(105°Ls), ISHADOH (Id) at
On 19 Jan(106°Ls), HIGA (Hg) at
After a long spell of snowy weather, MINAMI (Mn) at Fukui expected a clear sky on 21 Jan (106°Ls), brought with him a shovel to remove the snow and went to the Observatory to find the planet at last at 6:30 JST: He observed thus at LCM=030°W and LCM=040°W where M Acidalium and the area of Auroræ S were quite dark, and S Meridiani was detected in the former session. Tharsis came in the latter with an off-white tint. The npc looked small but clear. The southern limb was also slightly whitish light.
We have the Video images by Hg taken on 23 Jan (107°Ls) at LCM=344°W, LCM=354°W and LCM=004°W: In the first half
On 24 Jan (107°Ls), Myron WASIUTA (MWs)
On 26 Jan (108°Ls) DPk took a set of drawings at LCM=180°W in R and B (Wr38A/Wr47): In R a shadow was seen around at Propontices, and in B an evening cloud at Tharsis and a limb cloud largely in the morning.
Then on 28 Jan (109°Ls), DPk made his Birthday shots at LCM=168°W: The area from Olympus Mons to the evening terminator is very cloudy orographically. Propontis I is clearly visible and Phlegra-Cerberus looks dark on the morning side preceding the morning misty Elysium. The npr is whitish vague without the explicit npc. The southern limb is dull in B.
The same day, MWs observed at LCM=177°W (at 11:39 GMT) but the seeing was too poor to detect the details except the presence of the southern markings.
On 30 Jan (110°Ls) Mn observed at LCM=296°W and LCM=306°W under a rather preferable seeing condition: S Sabæus was already evident in the morning and
2 February ~ 15 February 2001
On 2 Feb (112°Ls), Mo obtained good images at LCM=260°W,
On the same 6 Feb (114°Ls), Hg under the same sky switched the Video button at LCM=222°W and 232°W: They also show Elysium inside the disk, and the Ætheria dark patch is shown. The images, different from the previous Video images, show the southern limb light. At LCM=232°W, Syrtis Mj seems to show up.
8 Feb (114°Ls) DPk acquired interesting images at LCM=061°W and
065°W where a thick mist starts from the evening Chryse
to the morning side along the equatorial band,
On 10 Feb (116°Ls, apparent diameter=6.7"), our colleague
AKUTSU (Ak) made a first shot at LCM=169°W. The
surface is featureless because of a poor seeing, but the technique of the colour composite looked to have improved.
On 11 Feb (116°Ls) at LCM=034°W , Carlos HERNANDEZ (CHr) made a set of drawings where M Acidalium was near the CM invaded by a light streak inside the Mare from NW to SE. The area around
About ten hours later on 11 Feb (116°Ls) from LCM=162°W to LCM=206°W, Mo at Hiroshima took several CCD images though they are not so stable: The area around Propontis I looks shadowy.
PEACH (DPc) then acquired drawings on 13 Feb (117°Ls) at LCM=288°W and on 14 Feb (117°Ls) at LCM=278°W:
Several hours later, Don PARKER (DPk) made a Valentine day's observation at
LCM=003°W (at 117°Ls) and a good images where S Sabæus
was near the evening terminator and to its north the Æria evening mist exists.
Near the following limb Chryse is quite misty. The npr has a white patch which is
larger in R than in B and looks irregular. The central latitude=9.5°N. The
southern limb is covered by a dull white matter as if protruding.
Finally on 15 Feb (117°Ls), Hg took a Video image at LCM=153°W in which the s limb looks weaker than the cases on the previous 6 Feb (different angles).
We tentatively note that the images by DPk are all excellent while generally speaking few explicitly depicts the npc in the colour composites. One reason is because the tilt of the northern pole is going away, and hence the npc is too near the limb to be shot clearly, and another may possibly be because the images of the limb haze through the Blue light are sometimes unbalanced if compared with the images through the Red light. At any rate, the image of the npr of the colour composites looks different from the image through the naked eye. It is however unknown whether the Red light images of the npc through the German filter RG610 are right but incompatible with the B images of the limb hazes by the use of the Japanese made interference filter he recently uses (maybe the one called IDAS LRGB Type 2 produced by the ICAS Enterprises) or vice versa. However, the B image on 14 Feb (117°Ls) at LCM=003°W is not excessive and the R image shows a puzzled larger light patch in the npr than the supposed npc: If it were a white cloud it must have been shot thicker in B. So otherwise it might have been to prove a tentative frost or a local dust disturbance near the edge of the npc. Perhaps we need more images. We have DPk's images in 1999 to compare at the same season made on 30 Mar 1999 (117°Ls) at LCM=090°W, where the npc looked however quite normal.
he next issue shall review the observations made during a one-month period from 16 February (118°Ls) to 15 March 2001 (131°Ls). Note that our CMO Internet Web-Site has a Gallery Page where some new Mars images are flashed before our reviewing (that is, interesting images are posted on the Page as soon as they are received). We hope every CCD image is emailed in a jpg file with a file name beginning with the observer's name to email@example.com as well as to firstname.lastname@example.org. Drawings are preferred to be sent in an A4 sized format with just one drawing on one sheet.
Reports will be acknowledged if air-mailed to
M MINAMI at Mikuni
(ask the mail-address through email@example.com ) .