From Wikipedia, the free encyclopedia
Star in the constellation Ophiuchus
30 Ophiuchi
Location of 30 Ophiuchi (circled)
Observation data
Epoch J2000
Equinox J2000
Constellation
Ophiuchus
Right ascension
17h 01m 03.60142s
[1]
Declination
−4° 13′ 21.5308″
[1]
Apparent magnitude (V)
4.82
[2]
Characteristics
Spectral type
K4III
[3]
U−B
color index
+1.80
[4]
B−V
color index
+1.48
[4]
Astrometry
Radial velocity (Rv ) −6.70
[5] km/s
Proper motion (μ)
RA: −39.13
[6]
mas /
yr
Dec.: −78.09
[6]
mas /
yr
Parallax (π) 9.3138 ± 0.1676
mas
[1]
Distance 350 ± 6
ly (107 ± 2
pc )
Absolute magnitude (MV ) −0.65
[2]
Details
Radius 35.89+0.54 −2.12
[1]
R ☉
Luminosity 299.8± 6.2
[1]
L ☉
Surface gravity (log g ) 1.73
[7]
cgs
Temperature 4,009.00+126.67 −29.67
[1]
K
Metallicity [Fe/H]−0.03
[2]
dex
Rotational velocity (v sin i ) 1.4
[8] km/s
Other designations
30 Oph ,
NSV 8111,
BD −04°4215 ,
FK5 1445,
GC 22937,
HD 153687,
HIP 83262,
HR 6318,
SAO 141483,
CCDM J17011-0413A ,
WDS J17011-0413A
[9]
Database references
SIMBAD
data
30 Ophiuchi is a single
[10]
star in the
equatorial
constellation of
Ophiuchus , and figures 0.99° east (specifically
E½S ) of the heart of cluster
Messier 10 .
[11] It is visible to the naked eye as a faint, orange-hued point of light with an
apparent visual magnitude of 4.82.
[2] The distance to this star is approximately 350
light years based on
parallax .
[6] Its present motion is, net, one of approaching rather than parting, at −6.7 km/s, its "
radial velocity ".
[5]
This is an aging
giant star with a
stellar classification of K4III,
[3] having exhausted the supply of hydrogen at its
core and expanded to 36
[1] times the
Sun's radius . It is a suspected
variable star .
[12] The star is radiating 300
[1] times the
luminosity of the Sun from its swollen
photosphere at an
effective temperature of 4,009 K.
[1] It is emitting a far
infrared excess due to circumstellar dust,
[13] which extends out to a diameter of 240
AU and has a mass of 62× 1025 g .
[14]
The primary presents with two
visual companions : B, at magnitude 9.71 and separation 99.8″, and C, at magnitude 8.75 and separation 220.9
″ (3′ 40.9″) .
[15]
References
^
a
b
c
d
e
f
g
h
i
Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018).
"Gaia Data Release 2: Summary of the contents and survey properties" .
Astronomy & Astrophysics . 616 . A1.
arXiv :
1804.09365 .
Bibcode :
2018A&A...616A...1G .
doi :
10.1051/0004-6361/201833051 .
Gaia DR2 record for this source at
VizieR .
^
a
b
c
d Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331.
arXiv :
1108.4971 .
Bibcode :
2012AstL...38..331A .
doi :
10.1134/S1063773712050015 .
S2CID
119257644 .
Vizier catalog entry
^
a
b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H . 5050 .
Bibcode :
1995yCat.5050....0H .
^
a
b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers . 42 (2): 443.
Bibcode :
2014JAVSO..42..443M .
Vizier catalog entry
^
a
b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters . 32 (11): 759–771.
arXiv :
1606.08053 .
Bibcode :
2006AstL...32..759G .
doi :
10.1134/S1063773706110065 .
S2CID
119231169 .
^
a
b
c Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics . 474 (2): 653–664.
arXiv :
0708.1752 .
Bibcode :
2007A&A...474..653V .
doi :
10.1051/0004-6361:20078357 .
S2CID
18759600 .
Vizier catalog entry
^ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics . 591 : A118.
arXiv :
1605.07384 .
Bibcode :
2016A&A...591A.118S .
doi :
10.1051/0004-6361/201628497 .
S2CID
119258214 .
^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics . 561 : A126.
arXiv :
1312.3474 .
Bibcode :
2014A&A...561A.126D .
doi :
10.1051/0004-6361/201220762 .
S2CID
54046583 .
Vizier catalog entry
^
"30 Oph" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2019-06-19 .
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems".
Monthly Notices of the Royal Astronomical Society . 389 (2): 869–879.
arXiv :
0806.2878 .
Bibcode :
2008MNRAS.389..869E .
doi :
10.1111/j.1365-2966.2008.13596.x .
S2CID
14878976 .
^ O'Meara, Stephen James (1998).
Deep-Sky Companions: The Messier Objects . Cambridge University Press. p. 63.
ISBN
9780521553322 .
^ Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports . 5.1. 61 (1): 80–88.
Bibcode :
2017ARep...61...80S .
doi :
10.1134/S1063772917010085 .
S2CID
125853869 .
^ Zuckerman, B.; et al. (June 1995).
"Luminosity Class III Stars with Excess Far-Infrared Emission" . Astrophysical Journal Letters . 446 : L79.
Bibcode :
1995ApJ...446L..79Z .
doi :
10.1086/187935 .
^ Jura, M. (April 1999).
"Dust around First-Ascent Red Giants" . The Astrophysical Journal . 515 (2): 706–711.
Bibcode :
1999ApJ...515..706J .
doi :
10.1086/307064 .
^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001).
"The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" . The Astronomical Journal . 122 (6): 3466.
Bibcode :
2001AJ....122.3466M .
doi :
10.1086/323920 .
Vizier catalog entry