Rho1 Sagittarii

{{For|other star systems with this Bayer designation|Rho Sagittarii{{!}}ρ Sagittarii}}

{{Starbox begin

| name = ρ¹ Sagittarii

}}

{{Starbox image

| image =

{{Location mark

|image=Sagittarius constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=Rho¹ Sagittarii

|x=113|y=172

}}

| caption = Location of ρ¹ Sagittarii (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Sagittarius

| ra = {{RA|19|21|40.35942}}

| dec = {{DEC|-17|50|49.9168}}

| appmag_v = 3.93

}}

{{Starbox character

| type =

| class = A9IV

| b-v = +0.22

| u-b = +0.14

| variable = δ Sct

}}

{{Starbox astrometry

| radial_v = +1.20

| prop_mo_ra = −25.87

| prop_mo_dec = +21.46

| parallax = 25.69

| p_error = 0.19

| parallax_footnote =

| absmag_v = 0.97

}}

{{Starbox detail

| mass = 1.91

| radius = {{Val|3.31|0.24|0.26}}

| temperature = {{Val|7469|201|261|fmt=commas}}

| luminosity = {{Val|30.7|0.8}}

| rotational_velocity = 68

| gravity = 3.89

| metal_fe = −0.02

| age_myr = 893

}}

{{Starbox catalog

| names = {{odlist | B=ρ¹ Sgr | F=44 Sagittarii | BD=−18° 5322 | GJ=4107 | HD=181577 | HIP=95168 | HR=7340 | SAO=162512 | GC=26694 | GSC=06301-02457 | PPM=235882 }}

}}

{{Starbox reference

| Simbad = rho01+Sgr

}}

Rho¹ Sagittarii, Latinized from ρ¹ Sagittarii, is a single, variable star in the southern constellation of Sagittarius. It has a white hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around 3.93. The distance to this star is approximately 127 light years based on parallax, and it is drifting further away with a radial velocity of +1.2 km/s. It is positioned near the ecliptic and so it can be occulted by the Moon.

This object has a stellar classification of A9IV, matching a subgiant star that is evolving away from the main sequence. It is a low amplitude Delta Scuti variable, ranging from 3.94 to 3.90 magnitude with a period of 0.05 days. The star is 893 million years old and is spinning with a projected rotational velocity of 68 km/s. It has 1.9 times the mass of the Sun and 3.3 times the Sun's radius. The star is radiating 31 times the luminosity of the Sun from its photosphere at an effective temperature of 7,469 K.

References

{{reflist|refs=

{{cite journal

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| volume=85 | pages=478–489 | date=April 1980

| doi=10.1086/112700 | bibcode=1980AJ.....85..478E }}

{{cite journal

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| 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

| bibcode=2008MNRAS.389..869E | arxiv=0806.2878

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | s2cid=14878976 }}

{{cite journal | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | last1=Van Leeuwen | first1=F. | s2cid=18759600 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2095168 Vizier catalog entry]

{{cite journal |bibcode=2002yCat.2237....0D |title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system |journal=CDS/ADC Collection of Electronic Catalogues |volume=2237 |last1=Ducati |first1=J. R. |year=2002 }}

{{cite journal | doi=10.1086/504637 | bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770| title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample | journal=The Astronomical Journal | volume=132 | pages=161–170 | year=2006 | last1=Gray | first1=R. O. | last2=Corbally | first2=C. J. | last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T. | last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E. | last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R. | issue=1 | s2cid=119476992 }}

{{cite journal | bibcode=2009yCat....102025S |title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite journal | last=Wilson | first=R. E. | year=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Carnegie Institute Washington D.C. Publication | publisher=Carnegie Institution for Science | bibcode=1953GCRV..C......0W | lccn=54001336 }}

{{cite journal | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | title=XHIP: An extended hipparcos compilation | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | s2cid=119257644 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=V/137D/XHIP&HIP=95168 Vizier catalog entry]

{{cite journal

| bibcode=1999A&A...352..555A | arxiv=astro-ph/9911002

| title=Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures | journal=Astronomy and Astrophysics

| volume=352 | pages=555–562 | last1=Allende Prieto | first1=C. | last2=Lambert | first2=D. L. | year=1999 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/352/555/table1&Name=HIP95168 Vizier catalog entry]

{{cite journal

| 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 | arxiv=1501.03154

| doi=10.1088/0004-637X/804/2/146

| s2cid=33401607 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/ApJ/804/146/table5&HIP=95168 Vizier catalog entry]

{{cite journal

| title=Bright Star Catalogue | edition=5th Revised

| last1=Hoffleit | first1=D. | last2=Warren | first2=W. H.

| journal=VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H

| volume=5050 | year=1995 | bibcode=1995yCat.5050....0H }}

{{cite journal

| title=Dependence of kinematics on the age of stars in the solar neighborhood