Omicron Serpentis

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ο Serpentis
Ophiuchus constellation map.svg
Red circle.svg

Location of ο Serpentis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 17h 41m 24.87286s [1]
Declination −12° 52′ 31.1086″ [1]
Apparent magnitude (V) 4.24 [2]
Spectral type A2Va [3]
B−V color index +0.09 [2]
Variable type δ Sct[4]
Radial velocity (Rv) -30.20[5] km/s
Proper motion (μ) RA: -72.90[1] mas/yr
Dec.: -55.55[1] mas/yr
Parallax (π) 18.83 ± 0.25[1] mas
Distance 173 ± 2 ly
(53.1 ± 0.7 pc)
Absolute magnitude (MV) 0.62 [6]
Other designations
56 Serpentis, FK5 3405, GC 23978, HIP 86565, HR 6581, HD 160613, SAO 160747 [2]
Database references

Omicron Serpentis (ο Ser, ο Serpentis) is a star in the constellation Serpens.

Omicron Serpentis is a white A-type main sequence dwarf with an apparent magnitude of +4.24. It is approximately 173 light years from Earth.[1] It is classified as a Delta Scuti type variable star and its apparent magnitude varies by 0.01 with a period of 76 minutes.[7]


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c "Omicron Serpentis". SIMBAD Astronomical Database. Retrieved 2015-10-17. 
  3. ^ Houk, N. (1988), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988MSS...C04....0H 
  4. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S. 
  5. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ Absolute magnitude calculated as , where is the star's absolute magnitude, is the star's apparent magnitude, and is the star's measured parallax in arcseconds.
  7. ^ Chang, S.-W.; Protopapas, P.; Kim, D.-W.; Byun, Y.-I. (2013). "Statistical Properties of Galactic δ Scuti Stars: Revisited". The Astronomical Journal. 145 (5). arXiv:1303.1031Freely accessible. Bibcode:2013AJ....145..132C. doi:10.1088/0004-6256/145/5/132.  Vizier catalog entry