Nordic Mars Observers - Mars 1999 April 2

ObserverJohan Warell
Date1999 April 2
Time (UT)23:10
SiteGrönhögens Observatorium, Öland, Sweden
Instrument30 cm f/10 Schmidt-Cassegrain, x180
FilterI.L., W25, W21, W58, W80A, W38A, Pol. (drawing in I.L.)
Seeing (Ant.)III-IV
Ls118.8 deg
CML313.3 deg
Diameter14.2"
Phase0.98
Phase Angle16.9 deg
P38 deg
Q284 deg
NotesE/W reversed with respect to 16 cm apo view. Altitude 13 degrees. Syrtis Major very dark, distinct and with sharp borders. Sinus Sabaeus thin, and dark. Utopia and Mare Boreum diffuse and light. Ismenius Lacus dusky. Hellas very bright (the most prominent feature) and slightly yellowish in color. NPC, MLC and ELC white. A local cloud over E Mare Erythraeum - Meridiani Sinus became visible as it rotated onto the disk. Thin ELH visible with W80A.

Spectral visibility of light areas

Area/Filter	I.L.	W25	W21	W58	W80A	W38A	Pol.
NPC		B	B	B	B	B-VB	M-B	VB
ELC		M-B	M	M	M	M-B	M	M-B
Hellas		VB	M-B	M-B	B-VB	VB	B	VB		
E Mare Eryth.	NS	NS	NS	F-M	M	M	M
MLC		B	M-B	M	B	B	M-B	B

Observations made 23:05-23:40 UT in above filter order.

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