Beta Monocerotis (Struve 919)

Sketch of Beta Monocerotis (Struve 919/STF 919)

Sketch of Beta Monocerotis (Struve 919)

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Observation Notes:

Beta Monocerotis is a great multiple star. At low power, it appears to be a double star, but bumping up the magnification shows the eastern component to be a close double itself. Despite all three components being B class stars, I could not shake the impression of the primary appearing pale yellow. So, in my ongoing (and futile) effort to establish that I’m not a madman, I present other observes, some of whom have noted the yellow color too:

  • M. Bracewell: All Yellow
  • Nigel Puttick: All Yellow-White
  • 33 Doubles Observing Project
    TIm Leese: White/Pale-White/Pale-White
    William Schart: All Yellow
    Patrick Thompson: All White
    Eddy O’Connor: White/Greenish-White/Greenish-White
    Luis Balanzino: All White-Bluish
  • Cloudy Nights
    Vedran Vrhovac: All Cream-Yellow
    Rich N.: All Bluish-White
    Rich (RLTYS): Bluish-White(hint yellow), Bluish, White
    Mark K.: All Ice-Blue
Subject Beta Monocerotis (STF 919)
Classification Multiple Star
Position (J2000)* Monoceros [RA: 06:28:49.5 / Dec: -07:02:03.5]
Position Angle AB: 133° [My Measurement 2008.9]
AB: 132° [WDS 1831]*
AC: 126° [My Measurement 2008.9]
AC: 125° [WDS 1831]*
Separation AB: 8.6″ [My Measurement 2008.9]
AB: 7.2″ [WDS 1831]*
AC: 12″ [My Measurement 2008.9]
AC: 9.9″ [WDS 1831]*
BC: 2.6″ [My Measurement 2008.9]
BC: 2.5″ [WDS 1831]*
Magnitudes* A: 4.7; B: 5.2; C: 6.1
Spectral Types* A: B2V; B: B3V; C: B2V
Date/Time DEC 1, 2008 – 12:45 AM (DEC 1, 2008 – 07:45 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, slight breeze
Seeing 5/10 Pickering
Transparency Mag 6.0 NELM
*References The Washington Visual Double Star Catalog (Mason+ 2001-2009); Catalogue of Stellar Spectral Classifications (Skiff, 2009); SIMBAD

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