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1 Serpentis

{{Short description|Red giant star in the constellation Virgo}}

{{Starbox begin}}

{{Starbox image

| image=

{{Location mark

|image=Serpens Caput IAU.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=1 Ser

|x=758|y=838

}}

|caption=Location of 1 Serpentis (circled)

}}

{{Starbox observe

| constell = Virgo

| equinox = J2000.0

| epoch = J2000.0

| ra = {{RA|14|57|33.251}}

| dec = {{DEC|-00|10|03.40}}

| appmag_v = 5.5

}}

{{Starbox character

| type = Red clump

| class = K1III

| variable =

}}

{{Starbox astrometry

| radial_v = 20.12

| prop_mo_ra = +59.929

| prop_mo_dec = {{val|-26.500}}

| parallax = 10.1280

| p_error = 0.1010

| parallax_footnote =

| absmag_v = +0.76

}}

{{Starbox detail

| mass = 1.37

| temperature = 4,581

| radius = 13.6

| luminosity = 75

| gravity = 2.5

| metal_fe = {{val|-0.07}}

| rotational_velocity = 3.4

| age_gyr = 4.58

}}

{{Starbox catalogue

| names={{odlist|F=1 Ser|BD=+00°3277|GJ=3881|HD=132132|HIP=73193|HR=5573|SAO=120758}}

}}

{{Starbox reference

| Simbad = 1+Ser

}}

{{Starbox end}}

1 Serpentis (1 Ser) is a red giant in the constellation Virgo with an apparent magnitude of 5.5. It is a red clump giant, a cool horizontal branch star that is fusing helium in its core. It has expanded to over 13 times the radius of the Sun and although it is cooler at {{val|4,581|fmt=commas|ul=K}} it is 77 times more luminous. It is 322 light years away.

The Flamsteed designation 1 Serpentis was given to the star when the constellation Serpens was combined with the constellation Ophiuchus. It was also given the Bayer designation M Serpentis. When Ophiuchus and Serpens were separated into distinct constellations, 1 Serpentis was left over the border in Libra. Since then it has moved slightly and is now in Virgo.

A 10th-magnitude companion star discovered by William Herschel is {{val|86|ul="}} away. It is at the same distance as 1 Ser and shares a common proper motion, It is considered likely to be a physical companion, with the two stars separated by {{val|8,600|fmt=commas|ul=au}}. It has a spectral type of G5 IV, and it is slightly smaller and less luminous than the sun.

A much more widely-separated 10th-magnitude star is also listed in multiple star catalogues, but it is an unrelated background object.

References

{{reflist|refs=

{{cite Gaia DR3|3650900223700313088}}

{{cite DR2|3650900086261359232}}

{{cite DR2|3650886479804959360}}

{{cite journal |bibcode=1999MSS...C05....0H |title=Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5 |journal=Michigan Spectral Survey |volume=5 |last1=Houk |first1=N. |last2=Swift |first2=C. |year=1999 }}

{{cite journal |bibcode=2008AJ....135..209M |title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity |journal=The Astronomical Journal |volume=135 |issue=1 |pages=209 |last1=Massarotti |first1=Alessandro |last2=Latham |first2=David W. |last3=Stefanik |first3=Robert P. |last4=Fogel |first4=Jeffrey |year=2008 |doi=10.1088/0004-6256/135/1/209 |s2cid=121883397 |doi-access=free }}

{{cite journal |bibcode=2001AJ....122.3466M |title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog |journal=The Astronomical Journal |volume=122 |issue=6 |pages=3466 |last1=Mason |first1=Brian D. |last2=Wycoff |first2=Gary L. |last3=Hartkopf |first3=William I. |last4=Douglass |first4=Geoffrey G. |last5=Worley |first5=Charles E. |year=2001 |doi=10.1086/323920 |doi-access=free }}

{{cite journal |bibcode=2008MNRAS.389..869E |title=A catalogue of multiplicity among bright stellar systems |journal=Monthly Notices of the Royal Astronomical Society |volume=389 |issue=2 |pages=869 |last1=Eggleton |first1=P. P. |last2=Tokovinin |first2=A. A. |year=2008 |doi=10.1111/j.1365-2966.2008.13596.x |arxiv=0806.2878 |doi-access=free }}

{{cite journal |bibcode=1960AJ.....65...60S |title=A study of visual binaries having primaries above the main sequence |journal=The Astronomical Journal |volume=65 |pages=60 |last1=Stephenson |first1=C. B. |year=1960 |doi=10.1086/108191 }}

{{cite XHIP|73193}}

{{cite journal |bibcode=2008A&A...480...91S |title=Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants |journal=Astronomy and Astrophysics |volume=480 |issue=1 |pages=91 |last1=Soubiran |first1=C. |last2=Bienaymé |first2=O. |last3=Mishenina |first3=T. V. |last4=Kovtyukh |first4=V. V. |year=2008 |arxiv=0712.1370 |doi=10.1051/0004-6361:20078788 |s2cid=16602121 }}

{{cite journal |bibcode=2007AJ....133.2464L |title=Giants in the Local Region |journal=The Astronomical Journal |volume=133 |issue=6 |pages=2464 |last1=Luck |first1=R. Earle |last2=Heiter |first2=Ulrike |year=2007 |doi=10.1086/513194 |doi-access=free }}

{{cite book |bibcode=1991bsc..book.....H |year=1991 |title=The Bright star catalogue |last1=Hoffleit |first1=Dorrit |last2=Jaschek |first2=Carlos }}

{{cite web |title=Serpens, the serpent |url=http://www.ianridpath.com/startales/serpens.htm |author=Ian Rdipath |author-link=Ian Ridpath |access-date=2019-08-28 }}

}}

{{Stars of Virgo}}

{{Authority control}}

{{DEFAULTSORT:1 Serpentis}}

Category:Virgo (constellation)

Category:K-type giants

Serpentis, 01

5573

132132

073193

Category:Durchmusterung objects

3881

Serpentis, M

Category:Binary stars

Category:G-type subgiants

Category:Horizontal-branch stars