Open Access Articles- Top Results for Rho Aquarii

Rho Aquarii

<tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Astrometry</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></tr><tr style="vertical-align:top;"><td>Radial velocity (Rv)</td><td>–9[4] km/s</td></tr><tr style="vertical-align:top;"><td>Proper motion (μ)</td><td> RA: +14.75[1] mas/yr
Dec.: +1.84[1] mas/yr </td></tr><tr style="vertical-align:top;"><td>Parallax (π)</td><td>3.70 ± 0.38[1]mas</td></tr><tr style="vertical-align:top;"><td>Distance</td><td>approx. 880 ly
(approx. 270 pc)</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Details</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></th></tr><tr style="vertical-align:baseline;"><td>Mass</td><td>5.00 ± 0.22[5] M</td></tr><tr style="vertical-align:baseline;"><td>Luminosity</td><td>1,035[5] L</td></tr><tr style="vertical-align:baseline;"><td>Temperature</td><td>12,593[6] K</td></tr><tr style="vertical-align:baseline;"><td>Rotational velocity (v sin i)</td><td>65[3] km/s</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Other designations</th></tr><tr><td colspan="2">
46 Aquarii, BD–08 5855, HD 211838, HIP 110273, HR 8512, SAO 146023.[7]

Rho Aquarii <tr><td colspan="2" style="text-align:center;">

Location of ρ Aquarii (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 20m 11.91628s[1]
Declination –07° 49′ 15.9649″[1]
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This page is a soft redirect. Apparent magnitude (V)

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This page is a soft redirect. +5.34[2]

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This page is a soft redirect. Spectral type

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This page is a soft redirect. B8 IIIp Mn:Hg:[3]

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This page is a soft redirect. U−B color index

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Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.) </div>

Rho Aquarii (ρ Aqr, ρ Aquarii) is the Bayer designation for a binary star in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of +5.34.[2] Based upon parallax measurements made during the Hipparcos mission, this star is at a distance of roughly Script error: No such module "convert". from Earth.[1]

This is a single-lined spectroscopic binary, with the presence of a companion being revealed by Doppler shifts in the spectrum.[6] The primary is a giant star with a stellar classification of B8 IIIp Mn:Hg:.[3] It is a Mercury-Manganese star, showing a surfeit of these elements in the spectrum.[6] With five times the Sun's mass, this star is radiating 1,035[5] times as much luminosity from its outer atmosphere at an effective temperature of 12,593 K.[6] This heat gives it the blue-white hue of a B-type star.[8] The companion may be a variable star.[9]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357. 
  2. 2.0 2.1 2.2 2.3 Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars 8: 59, Bibcode:1984SAAOC...8...59C. 
  3. 3.0 3.1 3.2 Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590. 
  4. Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953QB901.W495...... 
  5. 5.0 5.1 5.2 Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, Bibcode:2010AN....331..349H, arXiv:1003.2335, doi:10.1002/asna.200911355. 
  6. 6.0 6.1 6.2 6.3 Makaganiuk, V. et al. (January 2011), "The search for magnetic fields in mercury-manganese stars", Astronomy and Astrophysics 525: A97, Bibcode:2011A&A...525A..97M, arXiv:1010.3931, doi:10.1051/0004-6361/201015666. 
  7. "rho Aqr -- Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-04. 
  8. "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16 
  9. Adelman, S. J.; Young, K. J. (January 2005), "uvby FCAPT photometry of the mCP stars HR 2258, MW Vul, and HR 9017 and the HgMn star 46 ρ Aqr", Astronomy and Astrophysics 429: 317–322, Bibcode:2005A&A...429..317A, doi:10.1051/0004-6361:20041118. 

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