Omicron Serpentis

{{Starbox begin

| name = Omicron Serpentis

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Serpens

| ra = {{RA|17|41|24.87286}}

| dec = {{DEC|-12|52|31.1086}}

| appmag_v = 4.26

}}

{{Starbox character

| class = A2 Va

| b-v = +0.07

| u-b = +0.08

| r-i =

| variable = δ Sct

}}

{{Starbox astrometry

| radial_v = {{Val|−30.2|1.2}}

| prop_mo_ra = −72.90

| prop_mo_dec = −55.55

| parallax = 18.83

| p_error = 0.25

| parallax_footnote =

| absmag_v = +0.760

}}

{{Starbox detail

| source =

| mass = 2.13

| radius = 2.2

| luminosity = 42.6

| temperature = {{Val|8972|305|fmt=commas}}

| gravity = {{Val|3.82|0.14}}

| metal_fe =

| rotational_velocity = {{Val|112.6|1.2}}

| age_myr = 518

}}

{{Starbox catalog

| names = ο Ser, 56 Ser, BD−12°4808, FK5 3405, HD 160613, HIP 86565, HR 6581, SAO 160747.

}}

{{Starbox reference

| Simbad = omi+Ser

}}

Omicron Serpentis (ο Ser, ο Serpentis) is a solitary star in the Serpens Cauda (tail) section of the equatorial constellation Serpens. Based upon an annual parallax shift of 18.83 mas as seen from Earth, 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.

This is a white-hued A-type main sequence star with a stellar classification of A2 Va. It is located on the lower instability strip 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.

The star has an estimated 2.13 times the mass of the Sun and about 2.2 times the Sun's radius. It is about half a billion years old and is spinning with a projected rotational velocity of 112.6 km/s. Omicron Serpentis is radiating 42.6 times the solar luminosity from its photosphere at an effective temperature of 8,972 K.

In 1909, the symbiotic nova{{Cite journal | doi = 10.1007/BF02044949| title = 9,6-Year periodicity of symbiotic nova RT Ser (1909) during the outburst decay from 1940 to 1994| journal = Astrophysics| volume = 39| issue = 1| pages = 15–19| year = 1996| last1 = Pavlenko | first1 = E. P.| last2 = Bochkov | first2 = V. V.| last3 = Vasil'yanovskaya | first3 = O. P.| bibcode = 1996Ap.....39...15P| s2cid = 120532937}} RT Serpentis appeared near Omicron, although it only reached a maximum magnitude of 10.{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=34603 |title=RT Serpentis |author1=VSX |last2=Osborne |first2=W. |date=1 April 2014 |work=AAVSO Website|publisher=American Association of Variable Star Observers|access-date=28 May 2014}}

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