2001 Mars Observation Reports -- #22--
OAA MARS SECTION
CMO Mars Observations
in the Second Half of March 2002 and the First Half of April 2002
from 16 March 2002 (343°Ls) to 15 April 2002 (358°Ls)
based on the article published in CMO #259 (25 April 2002)
by Masatsugu MINAMI, Director of the OAA Mars Section
HIS time we treat the period from
The season is now quite close to an end, and the
observation frequency has been lessened. On 16 March, the apparent angular
diameter was just 4.6", and further went down to 4.2" on 15 April.
Though the apparent declination has gone higher every day (+21°on 15 April),
the planet is quite low just above the Sun, and hence the surface contrast has
been lower even at the time of Sundown. From mid-March the
The central latitude changed from 18°S down to 11°S during the period. The phase angle decreased from 28°to 22°.
BSERVERS are still trying to find good seeing. KUMAMORI (Km) produced some good images. MORITA (Mo)'s images are sometimes unstable, but still he tries.
ISHADOH (Id) could not find observable conditions during the
period. The present writer (Mn) was busy in March,
but met better weather in April.
8 CCD Colour Images (19, 28, 30
60cm Cassegrain# with a Sony TRV-900
29 Drawings (16, 20 March; 2, 4, 5,
7, 9, 12,
600, 480, 400x 20cm ED Goto refractor *
Yukio (Mo) Hatsuka-ichi,
21 Sets of CCD Images (16, 17, 20,
21, 30, 31 March; 5, 7,
f/50 25cm speculum equipped with an ST-5C
1 Drawing (
Donald C (DPk)
1 Set of CCD Images (
f/55 41cm F/6 Newtonian equipped with a Lynxx PC
2 Sets of CCD Images (23,
f/29 31cm Meade SCT with an ST-5C
ON 16 March (343°Ls), Mn observed from LCM=171°W (8:40 GMT) to LCM=190°W: The dark band was visible, and M Sirenum looked darker on the afternoon side, and sometimes it combined with a dark area at the morning side as two spots. The spr was dull light. Temperature inside the dome was 13°C. On the same day MORITA (Mo) shot at LCM=186°W~201°W: Besides the dark M Sirenum, they show a shadowy area near Cerberus in the morning.
On 17 March (343°Ls), MURAKAMI (Mk) watched at LCM=171°W (the central latitude=18°S): He also
saw a bent dark band from M Sirenum to M Cimmerium. The spr looked whitish light. 15°C.
On 19 March (344°Ls), KUMAMORI (Km) produced the images at LCM=142°W, 147°W: they show a dark band from Dædalia to M Sirenum, and also an unidentified dark spot on the NH.
Mn, returned from Kyoto
to watch the Saturn occultation, watched Mars on 20 March (345°Ls) at LCM=124°W
(8:10GMT), 134°W, 144°W, 153°W (at 10:10 GMT) just before the occultation. The Dædalia dark area was seen to M Sirenum, and the EN limb of
the spr was whitish light. At
LCM=153°W, the northern neighbour of the main dark
band was misty whitish. At LCM=144°W, the morning side of the band looked
bluish though the seeing was poor. Saturn totally occulted but nearly grazed
and reappeared within half an hour (Titan was not). Unfortunately the seeing
was not enough to watch the details of the rings. 16°C.
On 21 March (345°Ls), Mo tried around at LCM=140°W, but the results are not satisfactory.
On 23 March (347°Ls), PEACH (DPc) in
On 28 March (349°Ls), Km obtained images at LCM=055°W, 061°W (at ), and DPc at LCM=191°W (at ):
About nine hours later, DPc took images where several minor dark and light markings on the NH as well as the dark band from M Sirenum to M Cimmerium are shown in IR as well as clearly in G. The B image does not show any clear bit of the nph.
On 30 March (350°Ls), Don PARKER (DPk) produced an excellent set of images at LCM=270°W (at
00:13 GMT), Km shot at LCM=040°W (at 09:10 GMT), and at 045°W, and
then Mo at LCM=051°W, 055°W, 061°W, & at 067°W.
DPk's images show the mouth of Hesperia, and the long-lost Mœris L. Hellas is slightly obvious in G, but not in B. In SMITH-SMITH,
Nine hours later, Km produced images showing the area of Auroræ S, repeating the features detected on 28 March. The white nph is also apparent. In the following images of Mo, the areas of M Erythræum and Auroræ S are dark and on the NH the area of Niliacus L to Nilokeras is visible in R and IR. The B image at LCM=066°W, the nph is shot.
On 31 March (351°Ls), Mo
tried at LCM=041°W~051°W, but the seeing was poorer.
On 2 April (352°Ls), Mn, who
just retired on 31 March, watched Mars after an absence at LCM=007°W~026°W: It
was hard any longer to detect minor markings since the apparent angular
diameter was 4.3", while the presence of the large dark markings was
obvious. The dark band in Noachis and M Erythræum
looked dark. The spr was whitish, and
On 4 April (353°Ls), Mn watched from LCM=342°W to 006°W: The seeing was poor, but
On 5 April (353°Ls), Mn
watched from LCM=245°W to 004°W, and Mo
obtained IR images at around LCM=010°W.
On 7 April (354°Ls), Mn
observed at LCM=320°W, 330°W, 340°W, and Mo took
images at LCM=335°W, 340°W, 346°W, 351°W. Mn saw
Syrtis Mj which became fainter later, while
Mn observed on 9 April
(355°Ls) at LCM=308°W, 318°W, and on 12 April (357°Ls) at LCM=264°W~293°W:
Syrtis Mj was apparent.
On 13 April (357°Ls), Mo took
images at LCM=287°W: Syrtis Mj was dark and
On 14 April (358°Ls), Mn
watched at LCM=245°W~264°W: The area of M Cimmerium was seen. The spr was whitish, and the plimb and the northern limb looked light. The season of
autumnal equinox was very ahead on the SH, and on the NH it was expected the nph was nearly the largest.
We further received as follows:
ISHIBASHI, Tsutomu (Is)
7 B&W Images (23, 30 July; 3, 17, 27
31cm f/6.4 speculum; HIE, NP400P and TP
PARKER, Donald C (DPk)
3 Sets of CCD Images (11,
f/55 41cm F/6 Newtonian equipped with a Lynxx PC
Is's B images in July 2001 (at LCM=020°W on 23 July and at LCM=286°W on 30 July) show the thick nph and the morning frost following the spc, but other wave lengths did not produce any dark marking. At the end of September 2001, Is feels that the markings are coming, but not yet explicit.
DPk's images should be
added to those in the preceding issue: The
images on 11 March (340°Ls) 2002 is an R image at LCM=108°W where the Dædalia patches are shown. On 13 March (341°Ls) DPk shot at
LCM=076°W & 080°W: Auroræ S is dark and the
coming dark spot in the Solis L area looks brownish. The nph is not explicit. On the same day, as already
reported in #258, Km observed 9 hours later
The nph is shown on Km's image at LCM=061°W on 28 March (349°Ls).
THE next report in #260 shall deal with the
observations during a one-month period from
Reports will be
acknowledged if air-mailed to M MINAMI at Mikuni
(ask the mail-address through firstname.lastname@example.org ) .