Delta Monocerotis

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δ Monocerotis
Monoceros constellation map.svg
Red circle.svg

Location of δ Monocerotis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Monoceros
Right ascension 07h 11m 51.860s[1]
Declination 0° 29′ 33.96″[1]
Apparent magnitude (V) 4.15[2]
Spectral type A2V[3]
U−B color index +0.04[4]
B−V color index +0.00[4]
Radial velocity (Rv) +15.00[5] km/s
Proper motion (μ) RA: +0.79[6] mas/yr
Dec.: +4.52[6] mas/yr
Parallax (π) 8.49 ± 0.17[6] mas
Distance 384 ± 8 ly
(118 ± 2 pc)
Absolute magnitude (MV) -1.20[2]
Mass 3.48[7] M
Luminosity 350[7] L
Temperature 9,462[7] K
Metallicity [Fe/H] 0.00[8] dex
Rotational velocity (v sin i) 154[7] km/s
Other designations
BD-00 1636, CCDM J07119-0030A, 22 Monocerotis, FK5 1187, GC 9518, HIP 34769, HR 2714, HD 55185, SAO 134330, WDS J07119-0030A
Database references

Delta Monocerotis (δ Mon) is a class A2V[3] (white main-sequence) star in the constellation Monoceros. Its apparent magnitude is 4.15[2] and it is approximately 384 light years away based on parallax.[6]

It has one reported companion, B, at separation 32.0" and magnitude 13.0.[9]


  1. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. 
  2. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  3. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H. 
  4. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M. Vizier catalog entry
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ a b c d 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.  Vizier catalog entry
  7. ^ a b c d Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052Freely accessible. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.  Vizier catalog entry
  8. ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814Freely accessible. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031.  Vizier catalog entry
  9. ^ Dommanget, J.; Nys, O. (2002). "VizieR Online Data Catalog: CCDM (Catalog of Components of Double & Multiple stars) (Dommanget+ 2002)". VizieR On-line Data Catalog: I/274. Originally published in: Observations et Travaux 54. 1274. Bibcode:2002yCat.1274....0D.  Vizier catalog entry