LtE in CMO #272


. . . . . . . Dear Mr. Murakami,

I have made an observation of Mars on May 8 (08:15 U.T.) under average seeing conditions (5-6/10, with moments of 7/10). I noted much detail over the Mare Erythraeum region as described below. Dust over the Argyre region was not noted at this time as recently reported as possibly being observed by some observers. Agathodaemon/Tithonius Lacus (the central portion of the great Valles Marineris) was prominently noted towards the following limb adjacent to an extremely bright morning limb haze (MLH). I welcome any comments on my Mars observation. I welcome any comments on my Mars observation.

The best of luck to the OAA Mars Section in your own observations of the red planet.



Date (U.T.): May 8, 2003

Time (U.T.): 08:15

CM: 055.8

Ls: 181.4, De: -17.2, Ds: -0.6

Diameter: 10.0 arc-seconds

Instrument: 9-inch (23-cm) F/13.5 Maksutov-Cassegrain

Magnification: 248x and 365x

Filter (Wratten): 30 (Magenta)

Seeing (1-10): 5-6 (moments of 7/10), Antoniadi (I-V): III

Transparency (1-6): 4


South Polar Hood (SPH): Appears extremely bright (10/10) over the southern limb.

Sinus Meridiani: It's following (western) border appears adjacent to the evening (preceding) limb enshrouded by an extremely bright (9/10) evening limb haze (ELH).

Margaritifer Sinus: Appears dark (3/10) and triangular-shaped towards the p limb.

Mare Erythraeum: Appears dark (3/10) with lighter (shaded, 6/10) regions

consisting of Pyrrhae Regio and Protei Regio (preceding to following). A dark (3/10) bar (Arsinoes Depressio?) appears to divide Pyrrhae Regio and

Protei Regio. Eos appears shaded to bright (6-7/10) north of Pyrrhae Regio.

Mare Australe: Appears dark (3/10) and uniform north of the SPH.

Aurorae Sinus: Appears dark (3/10) with a dark (3/10) projection from it's following end (possibly the southern portion of an obscured Ganges?).

Bosporos Gemmatus: Appears dark (3/10) and extends south between Aurorae Sinus and the SPH.

Agathodaemon (Coprates)/Tithonius Lacus: Appears dark (3/10) as a projection from the following border of Aurorae Sinus. This represents the central portion of the great Valles Marineris.

Chryse-Xanthe: Appears bright (7/10) without any detail visible within.

Niliacus Lacus: Appears as a dark (3/10) wedge towards the northern limb which connects to a dusky to dull (4-5/10) Nilokeras adjacent to an extremely bright (9/10) morning (following) limb haze (MLH).

North Polar Haze (NPH): Appears extremely bright (9/10) over the northern limb.


(9 May 2003 email)

Carlos HERNANDEZ (Miami, FL, USA)

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