HD 48099

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HD 48099
Monoceros constellation map.svg
Red circle.svg
Location of JD 48099 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Monoceros
Right ascension 06h 41m 59.2309s[1]
Declination +06° 20′ 43.531″[1]
Apparent magnitude (V) 6.37[2]
Spectral type O5.5V((f)) + O9V[3]
U−B color index −0.94[2]
B−V color index −0.05[2]
Radial velocity (Rv) +1.30[4] km/s
Proper motion (μ) RA: 0.84[1] mas/yr
Dec.: 2.55[1] mas/yr
Parallax (π) 1.17 ± 0.41[1] mas
Distance 1829[5] pc
Absolute magnitude (MV) −5.6[6]
Period (P) 3.0786 days
Semi-major axis (a) ~33 R
Eccentricity (e) 0.0
Inclination (i) 16°
Semi-amplitude (K1)
54.4 km/s
Semi-amplitude (K2)
96.2 km/s
Mass 55 M
Radius 11.6 R
Luminosity 450,000 L
Surface gravity (log g) 4.5 cgs
Temperature 44,000 K
Rotational velocity (v sin i) 330 km/s
Mass 19 M
Radius 6.5 R
Luminosity 40,000 L
Surface gravity (log g) 3.5 cgs
Temperature 32,000 K
Rotational velocity (v sin i) 185 km/s
Other designations
HR 2467, HD 48099, HIP 32067, SAO 114293, BD+06°1351
Database references

HD 48099 is a spectroscopic binary in the constellation Monoceros where both components are massive and luminous O stars.

Binary stars offer the opportunity to directly measure the mass of each component, but in the case the orbital inclination is very low and the masses cannot be accurately determined. The stars are orbiting extremely close together, separated only by about the diameters of the stars themselves. They complete one orbit in just over three days.[3]

Although HD 48099 only has a moderate space velocity of 37.7 km/s, it has produced a bow shock 2.26 parsecs from the star itself.[5]


  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D. 
  3. ^ a b c d Mahy, L.; Rauw, G.; Martins, F.; Nazé, Y.; Gosset, E.; De Becker, M.; Sana, H.; Eenens, P. (2010). "A New Investigation of the Binary Hd 48099". The Astrophysical Journal. 708 (2): 1537. arXiv:0912.0605Freely accessible. Bibcode:2010ApJ...708.1537M. doi:10.1088/0004-637X/708/2/1537. 
  4. ^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727. arXiv:astro-ph/0406573Freely accessible. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. 
  5. ^ a b Brown, D.; Bomans, D. J. (2005). "To see or not to see a bow shock". Astronomy and Astrophysics. 439: 183. arXiv:astro-ph/0505098Freely accessible. Bibcode:2005A&A...439..183B. doi:10.1051/0004-6361:20041054. 
  6. ^ Hutchings, J. B. (1976). "Spectroscopic measurements of OB supergiants". Publications of the Dominion Astrophysical Observatory Victoria. 14: 355. Bibcode:1976PDAO...14..355H.