[ it is located around 173 light years from the Sun. The star is visible to the naked eye with a base apparent visual magnitude of +4.26.[3]]This is a white-hued A-type main sequence star with a stellar classification of A2 Va.[4] It is located on the lower instability strip[12] and is classified as a Delta Scuti type variable star. The apparent magnitude of the star varies in the range 4.26−4.27 with a period of 76 minutes, or 0.053 days.[12][27]
The star has an estimated 2.13[13] times the mass of the Sun and about 2.2[14] times the Sun's radius. It is about half a billion[13] years old and is spinning with a projected rotational velocity of 112.6 km/s.[18] Omicron Serpentis is radiating 42.6[15] times the solar luminosity from its photosphere at an effective temperature of 8,972 K.[13]
References
1. ^1 2 3 {{citation | title=A catalogue of variable stars in the lower instability strip | last1=Garcia | first1=J. R. | last2=Cebral | first2=J. R. | last3=Scoccimarro | first3=E. R. | last4=Wahnon | first4=P. | last5=Arena | first5=R. | last6=Bazterra | first6=V. | last7=Pellizza | first7=L. | last8=Risi | first8=A. | last9=Rodriguez | first9=M. L. | last10=Zimmermann | first10=M. | journal=Astronomy and Astrophysics Supplement | display-authors=1 | volume=109 | pages=201–262 | date=February 1995 | bibcode=1995A&AS..109..201G | postscript=. }}
2. ^1 2 {{citation | last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A. | title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) | edition=3rd | journal=Astronomy and Astrophysics | display-authors=1 | volume=367 | pages=521–524 | date=February 2001 | doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289 | postscript=. }}
3. ^1 {{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | postscript=. |arxiv = 0806.2878 }}
4. ^1 2 {{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | postscript=. }}
5. ^1 {{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | postscript=. }}
6. ^1 2 3 4 5 6 7 {{citation | last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. | title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | journal=The Astrophysical Journal | volume=804 | issue=2 | pages=146 | year=2015 | bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146 | arxiv=1501.03154 | postscript=. }}
7. ^1 2 {{citation | last1=Díaz | first1=C. G. | last2=González | first2=J. F. | last3=Levato | first3=H. | last4=Grosso | first4=M. | title=Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum | display-authors=1 | journal=Astronomy & Astrophysics | volume=531 | page=A143 |date=July 2011 | doi=10.1051/0004-6361/201016386 | bibcode=2011A&A...531A.143D | arxiv=1012.4858 | postscript=.}}
8. ^1 2 {{citation | last1=Houk | first1=N. | postscript=. | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=4 | publication-place=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan | date=1988 | bibcode=1988mcts.book.....H }}
9. ^1 {{citation | display-authors=etal | postscript=. | last1=Samus | first1=N. N. | last2=Durlevich | first2=O. V. | title=General Catalogue of Variable Stars (Samus+ 2007-2013) | journal=VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S | volume=1 | year=2009 | bibcode=2009yCat....102025S }}
10. ^1 {{citation | title=Statistical Properties of Galactic δ Scuti Stars: Revisited | last1=Chang | first1=S.-W. | last2=Protopapas | first2=P. | last3=Kim | first3=D.-W. | last4=Byun | first4=Y.-I. | journal=The Astronomical Journal | display-authors=1 | volume=145 | issue=5 | date=2013 | bibcode=2013AJ....145..132C | doi=10.1088/0004-6256/145/5/132 | arxiv=1303.1031 | postscript=. | page=132}}
11. ^1 2 3 4 {{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | journal=Catalogue of Eggen's UBV data | year=1986 | publisher=SIMBAD | bibcode=1986EgUBV........0M | postscript=. }}
12. ^1 {{cite simbad | title=omi Ser | accessdate=2017-03-23 | postscript=. }}