HR 2554

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HR 2554
Carina constellation map.svg
Red circle.svg
Location of A Carinae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Carina
Right ascension  06h 49m 51.31414s[1]
Declination −53° 37′ 20.8182″[1]
Apparent magnitude (V) +4.40[2] ([3])
Spectral type G6II + A1V[4]
U−B color index +0.61[2]
B−V color index +0.92[2]
R−I color index +0.45[2]
Variable type EA[3]
Radial velocity (Rv)26.0 ± 0.9[5] km/s
Proper motion (μ) RA: −1.99[1] mas/yr
Dec.: 17.58[1] mas/yr
Parallax (π)5.99 ± 0.18[1] mas
Distance182[4] pc
Absolute magnitude (MV)−1.58[6]
Period (P)195.245 days
Eccentricity (e)0.00585
Inclination (i)82.7°
Semi-amplitude (K1)
24.2535 km/s
Semi-amplitude (K2)
38.6[4] km/s
Mass3.14 M
Radius31.3 R
Luminosity537 L
Surface gravity (log g)1.94 cgs
Temperature4,981 K
Mass1.98 M
Radius1.9 R
Luminosity25 L
Surface gravity (log g)4,18 cgs
Temperature9,388 K
Other designations
A Carinae, V415 Car, CCDM J06499-5337, CD−53°1613, CPD−53°1168, GC 8972, GSC 08536-00794, HD 50337, HIP 32761, HR 2554, PPM 335506, SAO 234737, TYC 8536-794-1
Database references

HR 2554, also known as V415 Carinae and A Carinae, is an eclipsing spectroscopic binary of the Algol type in the constellation of Carina whose apparent visual magnitude varies by 0.06 magnitudes and is approximately 4.39 at maximum brightness. Its primary is a G-type bright giant star and its secondary is an A-type main sequence star. It is approximately 553 light years from Earth.

HR 2554 A[edit]

The primary component, HR 2554 A, is a yellow G-type bright giant with a mean apparent magnitude of +4.4.

HR 2554 B[edit]

The secondary component, HR 2554 B, is a white A-type main sequence dwarf, about three magnitudes fainter than the primary.

HR 2554 binary system[edit]

HR 2554 has two components in orbit around each other, making it a binary star. The semi-major axis of the secondary's orbit is 2.17 arcseconds. The two components regularly eclipse each other, making A Carinae a variable star. Its brightness varies by 0.06 magnitudes with a period equal to its orbital period of 195 days.[3]


  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b c d HR 2554, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line August 23, 2008.
  3. ^ a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  4. ^ a b c d Brown, Alexander; Bennett, Philip D.; Baade, Robert; Kirsch, Thomas; Reimers, Dieter; Hatzes, Artie P.; Kürster, Martin (2001). "Ultraviolet Eclipse Observations and Fundamental Parameters of the Binary HR 2554 (G6 II+A1 V)". The Astronomical Journal. 122: 392. Bibcode:2001AJ....122..392B. doi:10.1086/321125.
  5. ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
  6. ^ Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724.
  7. ^ Komonjinda, Siramas; Hearnshaw, John B.; Ramm, David J. (2011). "Orbital solutions for six spectroscopic binaries with circular or nearly circular orbits". Monthly Notices of the Royal Astronomical Society. 410: 1761. Bibcode:2011MNRAS.410.1761K. doi:10.1111/j.1365-2966.2010.17558.x.