2001 Mars Observation Reports -- #03 --
OAA MARS SECTION
made during the period
from16 Dec 2000 (090°Ls) to
based on the article published in CMO #239 (
by Masatsugu MINAMI, Director of the OAA Mars Section
The 2001 Mars now comes to the meridian at dawn, but apparently its altitude is already low; the apparent declinations was -14.5° on 15 January 2001, and it is uneasy to know that it will further go down by more than 10 degrees. Welcome are new participants.
This report deals with the period from 16 December 2000
(090°Ls) to 15 January 2001 (103°Ls), during which the
apparent diameter went up from 4.8 arcsecs to 5.7 arcsecs, the central latitude of Mars gradually changed
from 21°N down to 16°N, and the phase angle increased from 30° to 35°. We
suffer from dismal weathers in winter, but if the seeing is good, it is now
possible to watch the planet from 4:30 local time.
e received the observation reports from the following ten observers while the angular diameter was still under 6 arcsecs.
CIDADÃO, António José (ACd)
1 Set of CCD Images (14 January 2001)
25cm SCT equipped with an ST-5C + AO
HERNANDEZ, Carlos E (CHr)
1 Set of Drawings (
290, 410x 20cm SCT
HIGA, Yasunobu (Hg)
4 Video images (24, 28 December 2000; 1 January 2001)
25cm F6.7 spec equipped with Sony DCR-TR V900
7 Drawings (18, 24 December 2000; 1, 2, 11 January 2001)
400, 530×31cm speculum
MINAMI, Masatsugu (Mn)
43 Drawings (16, 17, 19, 21, 22, 29 December 2000; 1, 6, 8 January 2001)
400,480,600x 20cm refractor*
MORITA, Yukio (Mo) Hatsuka-ichi,
24 Sets of CCD Images
(18, 22, 23, 25, 28 November;
1, 6, 8, 15, 17, 21, 22, 27, 29 December 2000; 10, 11 January 2001)
f/50 25cm speculum equipped with an ST-5C
7 Drawings (19, 29 December 2000)
400,480x 20cm refractor*
PARKER, Donald C (DPk)
2 Sets of CCD Images (28 December 2000)
f/55 41cm speculum equipped with a Lynxx PC
PEACH, Damian A (DPc)
2 Drawings (22 December 2000; 13 January 2001)
410,590×31cm Meade SCT
WASIUTA, Myron E (MWs)
2 Drawings (24,
16 December~22 December
On 16 Dec (090°Ls) and 17 Dec (091°Ls) the present writer (Mn) watched the Martian surfaces from LCM=344°W to 027°W: In the first half of the session, a misty evening Syrtis Mj was seen.
ISHADOH (Id ) also detected the dark M Acidalium on 18 Dec (091°Ls) at LCM=359°W, followed by the limb light haze.
On 19 Dec (091°Ls), NAKAJIMA (Nj) and Mn observed from LCM=334°W to LCM=003°W:
Mn observed on 21 Dec (092°Ls) at LCM=295°W ~ LCM=344°W and on (093°L) at LCM=286°W ~ LCM=334°W: Used partially was O56. Syrtis Mj rotated from near the CM to the evening side.
On 21 Dec and 22 Dec, Mo took images: The evening Syrtis Mj was shot unstable, but the image at LCM=318°W on 22 Dec (093°Ls) shows it definitely. On the morning of 22 Dec (JST), the temperature at
PEACH, WASIUTA, PARKER and others during 22 December ~ 29 December
On the same day, 22 Dec (093°Ls), Damian PEACH (DPc) acquired his first drawing this season at 6:50 GMT, earlier than ours by 15 hours, at LCM=105°W where the area of Solis L was shadowy and Xanthe was light near the evening terminator. It seems he saw a light area to the north of Solis L. Used partially Wr21. The apparent diameter grew to 5.0".
On 24 Dec (094°Ls), Myron WASIUTA (MWs) made his first observation at :
On 26 Dec (094°Ls), MWs detected the npc together with the dark surroundings at LCM=105°W.
On 27 Dec (095°Ls) Mo met a seeing so good that he obtained a sequence of good images at LCM=263°W, 268°W, 275°W and 280°W from 22:55 GMT: Every R shows almost all dark markings including Syrtis Mj. The B images are also better to show largely
On 28 Dec (095°Ls), Don PARKER(DPk) shot at LCM=105°W (at 11:05GMT) and at LCM=114°W where the Xanthe-Tharsis area looks white strong: Other limb areas and the npc look blurred because of the B enhancement. On the same day, Hg used his Video camera at LCM=256°W; the colour is unbalanced because of the shot in the twilight.
As the New Year came in
As the first year of the New Century came in, 1 January 2001(097°Ls) observations were made at LCM=196°W (by Mn), LCM=206°W (by Hg), LCM=218°W (by Id), LCM=220°W (by Hg) and LCM=231°W (by Id): Hg's images show the dark area of Utopia surrounding the npc, and Id pointed out that the brightness of Hellas became evident at LCM=231°W, but he reported that Elysium was not evident near the CM.
On 2 Jan (098°Ls), Id observed at LCM=216°W and LCM=226°W; in the former the evening terminator had a faint light patch, and in the latter Hellas came in.
On 6 Jan (099°Ls) Mn observed from LCM=155°W to 184°W; First Tharsis appeared compactly bright near the evening terminator, and at LCM=174°W several light and shade areas were visible. The npc looked very roundish.
On 8 Jan (100°Ls) Mn observed from LCM=116°W to LCM=164°W: At LCM=145°W, an evening cloud was seen at Alba while Tharsis was not so light. At the opposite side, a light patch at the SW limb. The npc was whitish evident, and Elysium was morning light.
On 11 Jan(102°Ls), Id took a drawing at LCM=131°W where the area of Solis L was shadowy and Xanthe was evening light.
On 10 Jan and 11Jan, Mo took several images, but no definite features are given due to the poor seeing.
Carlos HERNANDEZ (CHr) at
On 13 Jan (102°Ls), DPc obtained a good drawing at LCM=252°W in which Syrtis Mj occupied the main role, and
On 14 Jan (103°Ls), António CIDADÃO (ACd) in
Thus we traced the observations to the effect that the seasonal changes were undergoing normal within a gross scope of the present angular diameter.
he CMO was first published
on 25 January 1986, and so the present issue is the first after 15 years. At
that time, the CMO did not have a full column of observation reports yet,
because we did not have an effective observation system yet. The present writer
had however already started his routine work from 8 December 1985 (at 093°Ls,
the apparent diameter=4.4") at
Many received damages from the snowfall, and one night NAKAJIMA (Nj) was unfortunately confined in a stuck train for more than ten hours before digging the Observatory. Nj also remembers well the previous heavy snowfall in 1986, but MINAMI (Mn) does not perhaps because he was observing away at
The year 1986 was fruitful to Mn as well as to the CMO despite the troubles in winter, and hence we hope the skies will be promising in the coming summer as well.
We hear MURAKAMI (Mk) already started his routine observations while his reports have not reached yet.
he next issue shall review the observations made during a one-month period from 16 January (104°Ls) to 15 February 2001 (118°Ls). We hope every CCD image is emailed in a jpeg 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 ) .