Epsilon Monocerotis (Struve 900)

Sketch of Epsilon Monocerotis (Struve 900/STF 900)

Sketch of Epsilon Monocerotis (Struve 900)

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Observation Notes:

Epsilon Monocerotis resides in a populous star field. Color was subtle, and it seemed that the A8 primary was pale yellow while the F5 secondary appeared steel blue-gray. Other observers see the colors as follows:

There is a 3rd, 12th-magnitude star 94 arc seconds away at a PA of 254 degrees that is listed as the C component of Struve 900. This seems to match up with a faint star I plotted to the west of the brighter pair.

Subject Epsilon Monocerotis (STF 900)
Classification Multiple Star
Position (J2000)* Monoceros [RA: 06:23:46.1 / Dec: +04:35:34.2]
Position Angle AB: 29° [My Measurement 2008.9]
AB: 28.1° [Wycoff 1999.96]*
AC: 254° [WDS 1911]*
Separation AB: 10.3″ [My Measurement 2008.9]
AB: 12.4″ [Wycoff 1999.96]*
AC: 93.6″ [WDS 1911]*
Magnitudes* A: 4.4; B: 6.7; C: 12.7
Spectral Types* A: A8V(n); B: F5V
Date/Time DEC 1, 2008 – 12:15 AM (DEC 1, 2008 – 07:15 UT)
Observing Loc. Flagstaff, AZ – Home
Instrument Orion SkyQuest XT8 Dobsonian (203 mm dia./1200 mm F/L)
Eyepieces/Mag. Pentax XW10 + 2X Barlow (240X)
Meade Astrometric EP + 2X Barlow (200X)
Conditions Clear, cool, breezy
Seeing 5/10 Pickering
Transparency Mag 6.0 NELM
*References The Washington Visual Double Star Catalog (Mason+ 2001-2009); Double stars in astrometric catalogs (Wycoff+, 2006); Catalogue of Stellar Spectral Classifications (Skiff, 2009); SIMBAD

2 Replies to “Epsilon Monocerotis (Struve 900)”

  1. Just today I found out your web site. I only have seen the Double Star section. I think you have done more than EXCELLENCE job.
    I will began to compare you picturas against what I will see with my telescope (Meade 8″ classic LX 200).
    Thank yu for all your efford and for shearing with us.
    Sincerelly your
    Ricardo Calderon

  2. Ricardo, thank you, I’m glad you are enjoying the site! I often compare what I’ve observed to other observers’ sketches too. I keep links to a variety of other sketch galleries here: Astronomical Sketching Resources. Scroll down to the “Astronomical Sketching Galleries” section…you’ll find a lot of great sites to browse.

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