k Puppis

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k Puppis
Puppis constellation map.svg
Red circle.svg

Location of k Puppis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis
Right ascension 07h 38m 49.88s
Declination -26° 48' 14.0"
Apparent magnitude (V) +4.50
Right ascension 07h 38m 49.80s
Declination -26° 48' 13.0"
Apparent magnitude (V) +4.62
Spectral type B6 V
Spectral type B5 IV
Distance 454 ly
(139.26 pc)
Absolute magnitude (MV) -1.92 / -1.81
Other designations
k1: HR 2948, HD 61555, SAO 174198, NSV 3673, HIP 37229
k2: HR 2949, HD 61556, SAO 174199, NSV 3673
Database references
SIMBAD k1 data
SIMBAD k2 data

k Puppis (k Pup, k Puppis) is a Bayer designation given to an optical double star in the constellation Puppis, the two components being k1 Puppis and k2 Puppis.

Bayer designation[edit]

Note that the Bayer designation for this star is "k" not "kappa" (κ). In Bayer's original Uranometria, k Puppis was listed as ρ (rho) Navis.[1] When Lacaille broke apart the large constellation Argo Navis into Carina, Puppis, and Vela, he re-designated the stars with greek letters in a single sequence across all three constellations. Additionally, Lacaille used latin letters for many additional stars. κ (kappa) is in the constellation of Vela and so there is no kappa in Puppis.[2] The confusion also extends to the proper name Markab which properly applies to κ Velorum (and other stars) but which has also been used for k Puppis when it is called κ Puppis.[3]


Both k1 Puppis and k2 Puppis are bright blue B-type stars of nearly equal brightness, +4.50 and +4.62, respectively. To the naked eye, the pair has a combined magnitude of +3.80. On the sky, the two stars are separated by approximately 9.9 seconds of arc along PA 318°. The optical pair can be distinguished easily with a small telescope. The component k1 Puppis is a binary star system in its own right, while k2 Puppis is a variable star. Each star within the k Puppis optical pair is between 450 and 470 light years from Earth.


  1. ^ "Linda Hall Library Bayer, Johann, Explicatio...Uranometrias". Retrieved 2016-10-14. 
  2. ^ Ian Ridpath. "Argo Navis". Star Tales. Retrieved 27 Jan 2015. 
  3. ^ Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally published in: Institute of Astronomy of Russian Academy of Sciences (2002). 4027. Bibcode:2004yCat.4027....0K. 

External links[edit]