HD 48265

HD 48265
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 06h 40m 01.72603s[1]
Declination −48° 32′ 31.0345″[1]
Apparent magnitude (V) 8.07[2]
Characteristics
Spectral type G5IV/V[3]
Apparent magnitude (B) ~8.80[2]
Apparent magnitude (J) 6.842 ± 0.021[4]
Apparent magnitude (H) 6.529 ± 0.061[4]
Apparent magnitude (K) 6.449 ± 0.020[4]
Astrometry
Radial velocity (Rv)22.5 ± 0.2[5] km/s
Proper motion (μ) RA: +25.44[1] mas/yr
Dec.: +30.53[1] mas/yr
Parallax (π)11.71 ± 0.58[1] mas
Distance280 ± 10 ly
(85 ± 4 pc)
Absolute magnitude (MV)3.34[6]
Details
Mass0.93[6] M☉
Radius2.34 ± 0.26[7] R☉
Luminosity0.623 ± 0.058[7] L☉
Temperature5,508[5] K
Metallicity [Fe/H]0.29 ± 0.05[2] dex
Rotational velocity (v sin i)3.0[7] km/s
Age4.8[5] Gyr
Other designations
CD–48 2430, HD 48265, HIP 31895, SAO 218115.[8]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

HD 48265 is the Henry Draper Catalogue designation for a star in the southern constellation Puppis. It has an apparent visual magnitude of 8.07,[2] which makes it too faint to be seen with the naked eye. Based upon parallax measurements made during the Hipparcos mission, it is located at a distance of roughly 280 light-years (86 parsecs) from Earth, with a 3.6% margin of error.[1]

This star has a stellar classification of G5IV/V,[3] suggesting that, at an age of 4.8 billion years,[5] it has reached an intermediate evolutionary stage between a main sequence star and a subgiant. It has but 93% of the mass of the Sun,[6] while its outer atmosphere has begun to expand, reaching about 2.3 times the Sun's radius.[7] HD 48265 is radiating 62%[7] of the Sun's luminosity from its atmosphere at an effective temperature of 5,508 K,[5] giving it the cool orange glow of a K-type star.[9] Measurement of the chemical abundances of this star indicate that, compared to the Sun, it has a 95%[2] greater proportion of elements other than hydrogen and helium—what astronomers term the star's metallicity.

Planetary system

In October 2008 the planet, HD 48265 b, was reported to be orbiting this star. This object was detected using the radial velocity method during an astronomical survey conducted by the Magellan Planet Search Program using the MIKE echelle spectrograph on the 6.5-m Magellan II (Clay) telescope.[6]

The HD 48265 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥1.16 ±0.38 MJ 1.51 700 ±8 0.18 ±0.13 — —

See also

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (November 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
  2. 1 2 3 4 5 Jenkins, J. S.; et al. (July 2008), "Metallicities and activities of southern stars", Astronomy and Astrophysics 485 (2): 571–584, arXiv:0804.1128, Bibcode:2008A&A...485..571J, doi:10.1051/0004-6361:20078611
  3. 1 2 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
  4. 1 2 3 Cutri, R. M.; et al. (June 2003), 2MASS All Sky Catalog of point sources, NASA/IPAC, Bibcode:2003tmc..book.....C
  5. 1 2 3 4 5 Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics 418: 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959
  6. 1 2 3 4 Minniti, Dante; et al. (2009), "Low-Mass Companions for Five Solar-Type Stars From the Magellan Planet Search Program", The Astrophysical Journal 693 (2): 1424–1430, arXiv:0810.5348, Bibcode:2009ApJ...693.1424M, doi:10.1088/0004-637X/693/2/1424
  7. 1 2 3 4 5 "HD 48265", NASA Exoplanet Archive (NASA), retrieved 2012-03-15
  8. ↑ "HD 48265 -- Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-03-15
  9. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16

External links

Coordinates: 06h 40m 01.727s, −48° 32′ 31.04″

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