| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| A | |
| Right ascension | 17h 18m 00.68112s [1] |
| Declination | −24° 17′ 12.8535″ [1] |
| Apparent magnitude (V) | 5.14 [2] |
| B | |
| Right ascension | 17h 18m 00.60620s [3] |
| Declination | −24° 17′ 02.8150″ [3] |
| Apparent magnitude (V) | 6.59 [2] |
| Characteristics | |
| A | |
| Spectral type | G8III [2] |
| U−B color index | 0.98 [4] |
| B−V color index | 1.046±0.005 [2] |
| B | |
| Spectral type | F6IV-V [2] |
| U−B color index | 0.05 [4] |
| B−V color index | 0.510±0.015 [2] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −28.97±0.13 [1] km/s |
| Proper motion (μ) |
RA: −57.544
[1]
mas/
yr Dec.: −7.725 [1] mas/ yr |
| Parallax (π) | 11.5763 ± 0.1756 mas [1] |
| Distance | 282 ± 4
ly (86 ± 1 pc) |
| Absolute magnitude (MV) | 0.38 [2] |
| B | |
| Radial velocity (Rv) | −29.70 [5] km/s |
| Proper motion (μ) |
RA: −56.561
[3]
mas/
yr Dec.: −12.457 [3] mas/ yr |
| Parallax (π) | 11.6213 ± 0.0603 mas [3] |
| Distance | 281 ± 1
ly (86.0 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.66 [2] |
| Details | |
| A | |
| Radius | 12.30+0.20 −0.32 [1] R☉ |
| Luminosity | 75.3±1.3 [1] L☉ |
| Surface gravity (log g) | 2.69 [6] cgs |
| Temperature | 4,849+63 −40 [1] K |
| Metallicity [Fe/H] | 0.33 [6] dex |
| B | |
| Radius | 2.99+0.10 −0.12 [3] R☉ |
| Luminosity | 12.629±0.086 [3] L☉ |
| Temperature | 6,296+130 −105 [3] K |
| Metallicity [Fe/H] | 0.23±0.08 [2] dex |
| Other designations | |
| A: GC 23344, HD 156349, HIP 84626, HR 6424, SAO 185238 [7] | |
| B: GC 23343, HD 156350, HIP 84625, HR 6425, SAO 185237 [8] | |
| Database references | |
| SIMBAD | AB |
| A | |
| B | |
ο Ophiuchi, Latinized as Omicron Ophiuchi, is a wide double star in the equatorial constellation of Ophiuchus. The co-moving pair are visible to the naked eye as a dim point of light, with the two components having apparent visual magnitudes of 5.14 and 6.59. [2] As of 2015, they had an angular separation of 10.0 ″ along a position angle of 354°. [9] The distance to both stars is approximately 281 light years based on parallax, and they are drifting closer to the Sun with a radial velocity of around −29 km/s. [5]
The brighter member of the pair, designated component A, is an aging giant star with a stellar classification of G8III. [2] With the supply of hydrogen at its core exhausted, it has expanded to 12 [1] times the radius of the Sun. The star is radiating 75 [1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,849 K. [1] The secondary star, component B, has a class of F6IV-V, [2] matching an F-type star with a luminosity class that is a blend of traits from a main sequence and a subgiant star. It has three [3] times the Sun's radius and is radiating 12.6 times the Sun's luminosity at 6,296 K. [3]
References
- ^ a b c d e f g h i j k l 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 e f g h i j k l 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.
- ^ a b c d e f g h i j 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 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
- ^ 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 Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode: 2014AJ....147..137L. doi: 10.1088/0004-6256/147/6/137.
- ^ "omi Oph A". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ "omi Oph B". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ Mason, Brian D.; et al. (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.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| A | |
| Right ascension | 17h 18m 00.68112s [1] |
| Declination | −24° 17′ 12.8535″ [1] |
| Apparent magnitude (V) | 5.14 [2] |
| B | |
| Right ascension | 17h 18m 00.60620s [3] |
| Declination | −24° 17′ 02.8150″ [3] |
| Apparent magnitude (V) | 6.59 [2] |
| Characteristics | |
| A | |
| Spectral type | G8III [2] |
| U−B color index | 0.98 [4] |
| B−V color index | 1.046±0.005 [2] |
| B | |
| Spectral type | F6IV-V [2] |
| U−B color index | 0.05 [4] |
| B−V color index | 0.510±0.015 [2] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −28.97±0.13 [1] km/s |
| Proper motion (μ) |
RA: −57.544
[1]
mas/
yr Dec.: −7.725 [1] mas/ yr |
| Parallax (π) | 11.5763 ± 0.1756 mas [1] |
| Distance | 282 ± 4
ly (86 ± 1 pc) |
| Absolute magnitude (MV) | 0.38 [2] |
| B | |
| Radial velocity (Rv) | −29.70 [5] km/s |
| Proper motion (μ) |
RA: −56.561
[3]
mas/
yr Dec.: −12.457 [3] mas/ yr |
| Parallax (π) | 11.6213 ± 0.0603 mas [3] |
| Distance | 281 ± 1
ly (86.0 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.66 [2] |
| Details | |
| A | |
| Radius | 12.30+0.20 −0.32 [1] R☉ |
| Luminosity | 75.3±1.3 [1] L☉ |
| Surface gravity (log g) | 2.69 [6] cgs |
| Temperature | 4,849+63 −40 [1] K |
| Metallicity [Fe/H] | 0.33 [6] dex |
| B | |
| Radius | 2.99+0.10 −0.12 [3] R☉ |
| Luminosity | 12.629±0.086 [3] L☉ |
| Temperature | 6,296+130 −105 [3] K |
| Metallicity [Fe/H] | 0.23±0.08 [2] dex |
| Other designations | |
| A: GC 23344, HD 156349, HIP 84626, HR 6424, SAO 185238 [7] | |
| B: GC 23343, HD 156350, HIP 84625, HR 6425, SAO 185237 [8] | |
| Database references | |
| SIMBAD | AB |
| A | |
| B | |
ο Ophiuchi, Latinized as Omicron Ophiuchi, is a wide double star in the equatorial constellation of Ophiuchus. The co-moving pair are visible to the naked eye as a dim point of light, with the two components having apparent visual magnitudes of 5.14 and 6.59. [2] As of 2015, they had an angular separation of 10.0 ″ along a position angle of 354°. [9] The distance to both stars is approximately 281 light years based on parallax, and they are drifting closer to the Sun with a radial velocity of around −29 km/s. [5]
The brighter member of the pair, designated component A, is an aging giant star with a stellar classification of G8III. [2] With the supply of hydrogen at its core exhausted, it has expanded to 12 [1] times the radius of the Sun. The star is radiating 75 [1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,849 K. [1] The secondary star, component B, has a class of F6IV-V, [2] matching an F-type star with a luminosity class that is a blend of traits from a main sequence and a subgiant star. It has three [3] times the Sun's radius and is radiating 12.6 times the Sun's luminosity at 6,296 K. [3]
References
- ^ a b c d e f g h i j k l 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 e f g h i j k l 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.
- ^ a b c d e f g h i j 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 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
- ^ 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 Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode: 2014AJ....147..137L. doi: 10.1088/0004-6256/147/6/137.
- ^ "omi Oph A". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ "omi Oph B". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ Mason, Brian D.; et al. (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.
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