  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 25m 35.11766s[1] |
| Declination | −23° 26′ 49.8150″[1] |
| Apparent magnitude (V) | 4.63[2] |
| Characteristics | |
| ρ Oph AB | |
| Spectral type | B2/3V + B2V[3] |
| U−B color index | -0.56[4] |
| B−V color index | +0.24[4] |
| Astrometry | |
| ρ Oph AB | |
| Radial velocity (Rv) | -11.40 ± 3[5] km/s |
| Proper motion (μ) | RA: -5.53[1] mas/yr Dec.: -21.74[1] mas/yr |
| Parallax (π) | 9.03 ± 0.90 mas[1] |
| Distance | 360 ± 40 ly (110 ± 10 pc) |
| Absolute magnitude (MV) | -2.5 ± 0.3[6] |
| Orbit[7] | |
| Primary | ρ Oph A |
| Companion | ρ Oph B |
| Period (P) | 2398 ± 326 yr |
| Semi-major axis (a) | 4.25 ± 0.79″ |
| Eccentricity (e) | 0.675 ± 0.322 |
| Inclination (i) | 135.3 ± 6.0° |
| Longitude of the node (Ω) | 77.5 ± 13.5° |
| Periastron epoch (T) | B 2327 ± 343 |
| Argument of periastron (ω) (secondary) | 226.1 ± 15.3° |
| Orbit[7] | |
| Primary | ρ Oph D |
| Companion | ρ Oph E |
| Period (P) | 675.5 ± 32.5 yr |
| Semi-major axis (a) | 1.01 ± 0.15″ |
| Eccentricity (e) | 0.707 ± 0.112 |
| Inclination (i) | 134.8 ± 2.7° |
| Longitude of the node (Ω) | 152.7 ± 4.6° |
| Periastron epoch (T) | B 2008.6 ± 34.2 |
| Argument of periastron (ω) (secondary) | 260.4 ± 1.1° |
| Details | |
| ρ Oph A | |
| Mass | 9.6[8] M☉ |
| Radius | 8.5 ± 1[9] R☉ |
| Luminosity | 13000[9] L☉ |
| Temperature | 21900[8] K |
| Rotation | 1.205 d[9] |
| Rotational velocity (v sin i) | 240 ± 10[9] km/s |
| ρ Oph B | |
| Mass | 8[10] M☉ |
| ρ Oph C | |
| Mass | 5[10] M☉ |
| ρ Oph D | |
| Mass | 3.06[7] M☉ |
| ρ Oph E | |
| Mass | 1.97[7] M☉ |
| Other designations | |
| ρ Oph AB: CD−23°12861, HIP 80473 | |
| ρ Oph A: HD 147933, HR 6112, SAO 184382 | |
| ρ Oph B: HD 147934, HR 6113, SAO 184381 | |
| ρ Oph C: CD−23°12862, HIP 80474, SAO 184383 | |
| Database references | |
| SIMBAD | ρ Oph |
| ρ Oph A | |
| ρ Oph B | |
| ρ Oph C | |
| ρ Oph D/E | |
Rho Ophiuchi (ρ Ophiuchi) is a multiple star system in the constellation Ophiuchus. The central system has an apparent magnitude of 4.63.[2] Based on the central system's parallax of 9.03 mas,[1] it is located about 360 light-years (110 parsecs) away.[1] The other stars in the system are slightly farther away.[11]
- ^ a b c d e f g van Leeuwen, F.; et al. (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.
- ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog. 2237. Bibcode:2002yCat.2237....0D.
- ^ Houk, N.; Smith-Moore, M. (1988). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations −26°.0 to −12°.0". Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4. Bibcode:1988mcts.book.....H.
- ^ a b Nicolet, B. (1964). "Catalogue of homogeneous data in the UBV photoelectric photometric system". Astronomy and Astrophysics Supplement Series. 34: 1–49. Bibcode:1978A&AS...34....1N.
- ^ 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.
- ^ Wegner, W. (2003). "The total-to-selective extinction ratio determined from near IR photometry of OB stars". Astronomische Nachrichten. 324 (3): 219–237. Bibcode:2003AN....324..219W. doi:10.1002/asna.200310081.
- ^ a b c d Novaković, B. (2007). "Orbits of Five Visual Binary Stars". Baltic Astronomy. 16: 435–442. arXiv:0712.4242. Bibcode:2007BaltA..16..435N.
- ^ a b Hernández, Jesús; Calvet, Nuria; Hartmann, Lee; Briceño, César; Sicilia-Aguilar, Aurora; Berlind, Perry (2005). "Herbig Ae/Be Stars in nearby OB Associations". The Astronomical Journal. 129 (2): 856–871. arXiv:astro-ph/0410494. Bibcode:2005AJ....129..856H. doi:10.1086/426918. S2CID 17672346.
- ^ a b c d Cite error: The named reference
Hubrigwas invoked but never defined (see the help page). - ^ a b Allen, Christine; Ruelas-Mayorga, Alex; Sánchez, Leonardo J.; Costero, Rafael (2018). "The dynamical evolution of multiple systems of trapezium type". Monthly Notices of the Royal Astronomical Society. arXiv:1809.03537. doi:10.1093/mnras/sty2502.
- ^ Cite error: The named reference
Cordinerwas invoked but never defined (see the help page).