Back Rho Ophiuchi Afrikaans رو أوفيوتشي (نجم) Arabic Rho Ophiuchi AST Ро Змиеносец Bulgarian Rho Ophiuchi Spanish رو مارافسای Persian Rho Ophiuchi Finnish Rho Ophiuchi French Rho Ophiuchi Italian へびつかい座ロー星 Japanese
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| 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) | −14.6±1.5[5] km/s |
| Proper motion (μ) | RA: −5.53 mas/yr[1] Dec.: −21.74 mas/yr[1] |
| Parallax (π) | 7.19±0.13 mas[6] |
| Distance | 451±12 ly (138.2±3.6 pc)[5] |
| Absolute magnitude (MV) | −2.5±0.3[7] |
| Orbit[5] | |
| Primary | ρ Oph Aa |
| Companion | ρ Oph Ab |
| Period (P) | 87.831±0.010 days |
| Semi-major axis (a) | 0.995±0.026 AU |
| Eccentricity (e) | 0.17931±0.00017 |
| Inclination (i) | 71.348±0.020° |
| Longitude of the node (Ω) | 303.385±0.034° |
| Periastron epoch (T) | 60101.11 RJD |
| Argument of periastron (ω) (secondary) | 4.80±0.24° |
| Semi-amplitude (K1) (primary) | 55.5±3.6 km/s |
| Semi-amplitude (K2) (secondary) | 65.7±3.6 km/s |
| Orbit[8] | |
| Primary | ρ Oph A |
| Companion | ρ Oph B |
| Period (P) | 2,398±326 years |
| 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[8] | |
| Primary | ρ Oph D |
| Companion | ρ Oph E |
| Period (P) | 675.5±32.5 years |
| 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[6] | |
| ρ Oph Aa | |
| Mass | 9.21±0.79[5] M☉ |
| Radius | 4.2±0.3 R☉ |
| Luminosity | 4,270+980 −800 L☉ |
| Surface gravity (log g) | 4.25±0.25 cgs |
| Temperature | 23,000±1,000 K |
| Rotation | 1.205[9] days |
| Rotational velocity (v sin i) | 206±5 km/s |
| Age | 15±6 Myr |
| ρ Oph Ab | |
| Mass | 7.79±0.70[5] M☉ |
| Radius | 3.1±0.2 R☉ |
| Luminosity | 1,000+400 −290 L☉ |
| Surface gravity (log g) | 4.25±0.25 cgs |
| Temperature | 19,000±1,000 K |
| Rotational velocity (v sin i) | 227±5 km/s |
| Age | 15±6 Myr |
| ρ Oph B | |
| Mass | 8[10] M☉ |
| ρ Oph C | |
| Mass | 5[10] M☉ |
| ρ Oph D | |
| Mass | 3.06[8] M☉ |
| ρ Oph E | |
| Mass | 1.97[8] M☉ |
| Other designations | |
| ρ Oph, 5 Oph, WDS J16256-2327 | |
| 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, it is located about 450 light-years distant.[5] The other stars in the system are slightly farther away.[11][clarification needed]
- ^ a b c 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. 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.
- ^ a b c d e f Klement, R.; Shultz, M. E.; Rivinius, Th. "Spatially resolved centrifugal magnetosphere caught in motion around the secondary component of ρ Oph A". arXiv:2505.10038.
- ^ a b Cite error: The named reference
Shultz2025was invoked but never defined (see the help page). - ^ 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.
- ^ 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).
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