Upsilon Ophiuchi

Short description: Multiple star in the constellation Ophiuchus

Upsilon Ophiuchi

Location of υ Ophiuchi (circled)

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Ophiuchus[1]
Right ascension |  16h 27m 48.17331s[2]
Declination | −08° 22′ 18.4156″[2]
Apparent magnitude (V) | 4.62[1]
Characteristics
Spectral type | kA2hA5VmA5[3]
U−B color index | +0.06[4]
B−V color index | +0.16[4]
Astrometry
Radial velocity (Rv)| −30.60[5] km/s
Proper motion (μ)|  RA: −97.526[2] mas/yr
Dec.: −33.97[2] mas/yr
Parallax (π)| 25.0819 ± 0.2300[2] mas
Distance| 130 ± 1 ly
(39.9 ± 0.4 pc)
Absolute magnitude (MV)| 1.75[1]
Orbit[6]
Primary| Aa1
Companion| Aa2
Period (P)| 27.218±0.0005 d
Semi-major axis (a)| ≥ 0.0583 astronomical unit|AU
Eccentricity (e)| 0.744±0.002
Periastron epoch (T)| 2,438,914.84±0.01 JD
Argument of periastron (ω)
(secondary)| 333.7±0.7°
Semi-amplitude (K1)
(primary)| 34.9±0.3 km/s
Semi-amplitude (K2)
(secondary)| 41.1±0.3 km/s
Orbit[7]
Primary| Aa
Companion| Ab
Period (P)| 82.8±1.4 yr
Semi-major axis (a)| 0.79±0.03″
Eccentricity (e)| 0.45±0.03
Inclination (i)| 31.2±5.7°
Longitude of the node (Ω)| 86.8±6.9°
Periastron epoch (T)| B 1994.1±1.0
Argument of periastron (ω)
(secondary)| 177.9±7.4°
Details
Aa1
Mass| 1.83[8] M☉
Radius| 1.6[8][lower-alpha 1] R☉
Luminosity| 16.56[1] L☉
Surface gravity (log g)| 4.45[9] cgs
Temperature| 8,364[9] K
Metallicity [Fe/H]| +0.14[1] dex
Rotational velocity (v sin i)| 44[10] km/s
Age| 50[8] Myr
Aa2
Mass| 1.47[8] M☉
Radius| 1.4[8][lower-alpha 1] R☉
Age| 50[8] Myr
Ab1
Mass| 0.82[8] M☉
Radius| 0.86[8][lower-alpha 1] R☉
Age| 45[8] Myr
Ab2
Mass| 0.70[8] M☉
Radius| 0.69[8][lower-alpha 1] R☉
Age| 45[8] Myr
Other designations

Alkarab, υ Oph, 3 Ophiuchi, BD−08°4243, FK5 3299, GC 22134, HD 148367, HIP 80628, HR 6129, SAO 141187, CCDM J16278-0822AB, WDS J16278-0822[11]

Database references
SIMBAD| data

| | | Aa1|

|
|
|
|

| | | | Period = 27.s d|
| |
| | | | Ab2|
| | Period = 82.8 yr|
| | | | Ab1|

| | | | Sep = 0.06 au|

| | | Ab2|

Hierarchy of orbits[8]

Upsilon Ophiuchi is a quadruple star system in the equatorial constellation of Ophiuchus. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.62. The distance to this system is approximately 130 light years based on parallax. It is drifting closer with a radial velocity of −30.6 km/s.

The variable radial velocity of the brighter component was first observed by H. A. Abt in 1961. It is a double-lined spectroscopic binary system with an orbital period of 27.2 days and an eccentricity of 0.74.[6] They have a combined magnitude of 4.71. Both components are similar stars with a combined stellar classification of kA2hA5VmA5, and one or both are Am stars.[3] The fainter component has an 82.8 year orbit with the brighter pair at an eccentricity of 0.45,[7] and is itself binary, making the system a quadruple.[8] The system is a source for X-ray emission.[12]

This system forms part of the Upsilon Ophiuchi cluster, a small group of six stars which share similar kinematics and are spread over about eight degrees. The two brightest stars, apart from Upsilon Ophiuchi itself, are sometimes listed as components B and C: B is HD 148300, and C is HD 144660.[8] Both are 9th-magnitude K-class dwarfs.[13]

## Notes

1. ↑ 1.0 1.1 1.2 1.3 Calculated using angular diameters (0.37, 0.33, 0.20 and 0.16 milliarcseconds) and a distance of 39.9 parsecs via the equation R/R☉ = (107.5

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Chambers, Robert; Thomson, Thomas Napier (1857). "[[s:A biographical dictionary of eminent Scotsmen/|]]". A Biographical Dictionary of Eminent Scotsmen. Glasgow: Blackie and Son. {{{1}}}Polish pronunciation: [{{{1}}}]Malagasy pronunciation: [{{{1}}}]Japanese pronunciation: [{{{1}}}]Armenian pronunciation: [{{{1}}}]Czech pronunciation: [{{{1}}}]∶Manx pronunciation: [{{{1}}}]http://www.iucnredlist.org/apps/redlist/details/full/{{{1}}}/0 Alemannic German pronunciation: [{{{1}}}]Tagalog pronunciation: [{{{1}}}]Egyptian Arabic pronunciation: [{{{1}}}]French pronunciation: ​[{{{1}}}]Error: Invalid time. In progressPalomares, M. L. D. and Pauly, D., eds. (2011). "{{{1}}} {{{2}}}" in SeaLifeBase. April 2011 version.Turkish pronunciation: [{{{1}}}]Finnish pronunciation: [{{{1}}}]Froese, Rainer and Pauly, Daniel, eds. (2006). "{{{1}}} {{{2}}}" in FishBase. April 2006 version.

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Chambers, Robert; Thomson, Thomas Napier (1857). "[[s:A biographical dictionary of eminent Scotsmen/|]]". A Biographical Dictionary of Eminent Scotsmen. Glasgow: Blackie and Son. {{{1}}}Polish pronunciation: [{{{1}}}]Malagasy pronunciation: [{{{1}}}]Japanese pronunciation: [{{{1}}}]Armenian pronunciation: [{{{1}}}]Czech pronunciation: [{{{1}}}]∶Manx pronunciation: [{{{1}}}]http://www.iucnredlist.org/apps/redlist/details/full/{{{1}}}/0 Alemannic German pronunciation: [{{{1}}}]Tagalog pronunciation: [{{{1}}}]Egyptian Arabic pronunciation: [{{{1}}}]French pronunciation: ​[{{{1}}}]Error: Invalid time. In progressPalomares, M. L. D. and Pauly, D., eds. (2011). "{{{1}}} {{{2}}}" in SeaLifeBase. April 2011 version.Turkish pronunciation: [{{{1}}}]Finnish pronunciation: [{{{1}}}]Froese, Rainer and Pauly, Daniel, eds. (2006). "{{{1}}} {{{2}}}" in FishBase. April 2006 version.

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|-Old Norse pronunciation: [{{{1}}}]Salish pronunciation: [{{{1}}}]Basque pronunciation: [{{{1}}}]{{{1}}}data-sort-value="" style="background: #ececec; color: #2C2C2C; vertical-align: middle; font-size: smaller; text-align: center; " class="table-na" | UnreleasedNorwegian pronunciation: [{{{1}}}]Expression error: Unrecognized punctuation character "{"., {{{year}}} (aged {{{4}}})Hungarian pronunciation: [{{{1}}}]Quechua pronunciation: [{{{1}}}]Arabic pronunciation: [{{{1}}}]Punjabi pronunciation: [{{{1}}}]Afrikaans pronunciation: [{{{1}}}]Romanian pronunciation: [{{{1}}}]Hebrew pronunciation: [{{{1}}}][INVALID OR MISSING PARAMETER IN TEMPLATE Upsilon Ophiuchi]Uto-Aztecan pronunciation: [{{{1}}}]Tamil pronunciation: [{{{1}}}]Hindustani pronunciation: [{{{1}}}]Swedish pronunciation: [{{{1}}}]Kazakh pronunciation: [{{{1}}}]

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Lao pronunciation: [{{{1}}}]Tibetan pronunciation: [{{{1}}}]Khmer pronunciation: [{{{1}}}]data-sort-value="" style="vertical-align:middle; text-align:center" class="table-na" | —`{{{1}}}`Welsh pronunciation: [{{{1}}}] Partially doneAthabaskan pronunciation: [{{{1}}}]Māori pronunciation: [{{{1}}}]IPA: [{{{1}}}]Bulgarian pronunciation: [{{{1}}}]Korean pronunciation: [{{{1}}}]Icelandic pronunciation: ​[{{{1}}}]Sanskrit pronunciation: [{{{1}}}]Bengali pronunciation: [{{{1}}}]Indonesian pronunciation: [{{{1}}}]Serbo-Croatian pronunciation: [{{{1}}}]CROSBI {{{1}}}d)/1000, where θ is the angular diameter and d is the distance.

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
3. ↑ 3.0 3.1 Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement 99: 135. doi:10.1086/192182. Bibcode: 1995ApJS...99..135A.
4. ↑ 4.0 4.1 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
5. ↑ Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication (Carnegie Institution for Science). ISBN 9780598216885. Bibcode: 1953GCRV..C......0W.
6. ↑ 6.0 6.1 Gutmann, F. (1965). "A study of the spectroscopic binary 3nu Ophiuchi (HD 148367)". Publications of the Dominion Astrophysical Observatory Victoria 12: 391–399. Bibcode: 1965PDAO...12..391G.
7. ↑ 7.0 7.1 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6.
8. ↑ 8.00 8.01 8.02 8.03 8.04 8.05 8.06 8.07 8.08 8.09 8.10 8.11 8.12 8.13 8.14 Waisberg, Idel; Klein, Ygal; Katz, Boaz (2025-01-01). "Hidden Companions to Intermediate-mass Stars. Upgraded Multiplicity 3 → 4. XXIV. Discovery of a 0.70 M⊙, 0.06 au Companion to Upsilon Ophiuchi Ab (Plus Discovery of the υ Oph Mini-cluster)". Research Notes of the American Astronomical Society 9 (1): 1. doi:10.3847/2515-5172/ada35c. ISSN 2515-5172. Bibcode: 2025RNAAS...9....1W.
9. ↑ 9.0 9.1 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D. Vizier catalog entry
10. ↑ 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.
11. ↑ "ups Oph". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Oph.
12. ↑ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics 475 (2): 677–684, doi:10.1051/0004-6361:20077429, Bibcode: 2007A&A...475..677S
13. ↑ Kharchenko, N. V. (2001). "All-sky compiled catalogue of 2.5 million stars". Kinematika I Fizika Nebesnykh Tel 17 (5): 409. Bibcode: 2001KFNT...17..409K.

* v
* t
* e

Stars of Ophiuchus

Bayer|

* α (Rasalhague)
* β (Cebalrai)
* γ
* δ (Yed Prior)
* ε (Yed Posterior)
* ζ (Han)
* η (Sabik)
* θ
* ι
* κ
* λ (Marfik)
* μ
* ν
* ξ
* ο
* ρ
* σ
* τ
* υ
* φ
* χ
* ψ
* ω

Flamsteed|

* 12
* 14
* 15
* 16
* 18
* 19
* 20
* 21
* 23
* 24
* 26
* 28
* 29
* 30
* 31
* 36 (Guniibuu)
* 37
* 38
* 41
* 43
* 44
* 45
* 50
* 51
* 52
* 53
* 54
* 58
* 61
* 66
* 67
* 68
* 70
* 71
* 72
* 73
* 74
* 24 Sco

Variable|

* U
* V
* X
* Y
* RS
* RV
* RZ
* ST
* SW
* TT
* TW
* UU
* WZ
* XX
* BF
* IX
* KK
* V380
* V426
* V438
* V442
* V445
* V451
* V453
* V502
* V508
* V566
* V567
* V716
* V839
* V841
* V849
* V986
* V1010
* V1054
* V2051
* V2052
* V2076
* V2105
* V2112
* V2113
* V2114
* V2118
* V2126
* V2129
* V2213
* V2214
* V2247
* V2291
* V2292
* V2301
* V2307
* V2324
* V2368
* V2388
* V2393
* V2400
* V2487
* V2502
* V2540
* V2542

HR|

* 5989
* 5990
* 6041
* 6067
* 6096
* 6124
* 6136
* 6137
* 6140
* 6144
* 6179
* 6189
* 6190
* 6193
* 6201
* 6202
* 6235
* 6248
* 6269
* 6284
* 6294
* 6296
* 6302
* 6308
* 6329
* 6340
* 6350
* 6353
* 6354
* 6358
* 6359
* 6361
* 6365
* 6367
* 6372
* 6375
* 6387
* 6390
* 6404
* 6413
* 6428
* 6433
* 6435
* 6439
* 6441
* 6465
* 6472
* 6473
* 6474
* 6476
* 6489
* 6490
* 6494
* 6497
* 6504
* 6507
* 6512
* 6516
* 6520
* 6521
* 6524
* 6532
* 6534
* 6575
* 6577
* 6578
* 6590
* 6593
* 6601
* 6633
* 6639
* 6650
* 6659
* 6667
* 6670
* 6686
* 6689
* 6690
* 6696
* 6706
* 6719
* 6784
* 6797
* 6800
* 6851
* 6857
* 6883
* 6902
* 6925
* 6976
* 6985
* 6987
* 7010

HD|

* 148390
* 148427 (Timir)
* 148531
* 149143
* 149382
* 150052
* 150381
* 150433
* 150493
* 152581 (Mahsati)
* 154088
* 156992
* 157172
* 160042
* 160346
* 164509
* 167162
* 170469
* 171028

Gliese|

* Gliese 673
* GJ 1207

Other|

* Barnard's Star

* AS 239
* BD -9 4395
* COROT-6
* DoAr 21
* GRO J1719-24
* GRS 1739-278
* GX 1+4
* GX 9+9
* H 1705-250
* Hen 3-1341
* IRAS 16293−2422
* K2-32
* LS IV -1 2
* 2MASS J16452211-1319516
* MXB 1659-29
* Nova Ophiuchi 1993
* PG 1627-017
* PSR B1929+10
* TOI-677
* Van Biesbroeck 8
* VVV BD001
* WISEP J180026.60+013453.1
* Wolf 635
* Wolf 1061
* XTE J1739-285

* List

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