Nu Hydri

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ν Hydri
Hydrus constellation map.svg
Red circle.svg

Location of ν Hydri (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Hydrus
Right ascension 02h 50m 28.46194s[1]
Declination −75° 04′ 01.0107″[1]
Apparent magnitude (V) 4.76[2]
Spectral type K3III[2]
U−B color index +1.56[3]
B−V color index +1.33[3]
Radial velocity (Rv) +4.70[4] km/s
Proper motion (μ) RA: -33.01[1] mas/yr
Dec.: -27.30[1] mas/yr
Parallax (π) 9.61 ± 0.16[1] mas
Distance 339 ± 6 ly
(104 ± 2 pc)
Absolute magnitude (MV) -0.33[2]
Luminosity 241[2] L
Surface gravity (log g) 3.30[5] cgs
Temperature 4,428[6] K
Metallicity [Fe/H] -1.52[5] dex
Rotational velocity (v sin i) 1.3[7] km/s
Other designations
FK5 2199, GC 3463, HIP 13244, HR 872, HD 18293, SAO 255929
Database references

Nu Hydri (ν Hyi) is a class K3III[2] (orange giant) star in the constellation Hydrus. Its apparent magnitude is 4.76[2] and it is approximately 339 light years away based on parallax.[1]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d e f Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  3. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M. Vizier catalog entry
  4. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  5. ^ a b Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384Freely accessible. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497. 
  6. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427: 343. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.  Vizier catalog entry
  7. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474Freely accessible. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.  Vizier catalog entry