HD 43848

HD 43848 is a 9th magnitude K-type subgiant star located approximately 123 light-years away in the constellation of Columba. The star is less massive than the Sun.

HD 43848
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Columba
Right ascension  06h 16m 31.36330s[1]
Declination –40° 31′ 54.7121″[1]
Apparent magnitude (V) 8.65[2]
Characteristics
Spectral type K2 IV[3]
Variable type 5.58[2]
Astrometry
Proper motion (μ) RA: +122.02[1] mas/yr
Dec.: +198.32[1] mas/yr
Parallax (π)26.42 ± 0.78[1] mas
Distance123 ± 4 ly
(38 ± 1 pc)
Details
Mass0.94 ± 0.06[2] M☉
Surface gravity (log g)4.54 ± 0.04[2] cgs
Temperature5,161 ± 41[2] K
Age3.7 ± 1.7[2] Gyr
Other designations
CD-40° 2356, HIP 29804, LTT 2505, NLTT 16340, SAO 217824.
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

On October 29, 2008, radial velocity measurements made with the MIKE echelle spectrograph on the 6.5-m Magellan II (Clay) telescope revealed the presence of a companion of at least 25 Jupiter masses orbiting the star.[4] Initially thought to be a brown dwarf, astrometric measurements reveal that the true mass of the object is 120+167
−43 Jupiter masses, implying that it is likely to be a red dwarf star.[5]

See also

References
  1. 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. Trevisan, M.; et al. (November 2011), "Analysis of old very metal rich stars in the solar neighbourhood", Astronomy & Astrophysics, 535: A42, arXiv:1109.6304, Bibcode:2011A&A...535A..42T, doi:10.1051/0004-6361/201016056. See table 13.
  3. Gray, R. O.; et al. (October 2003), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I.", The Astronomical Journal, 126 (4): 2048–2059, arXiv:astro-ph/0308182, Bibcode:2003AJ....126.2048G, doi:10.1086/378365
  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
  5. Sozzetti, A.; Desidera, S. (2010), "Hipparcos preliminary astrometric masses for the two close-in companions to HD 131664 and HD 43848. A brown dwarf and a low-mass star", Astronomy and Astrophysics, 509: A103, arXiv:0909.4454, Bibcode:2010A&A...509A.103S, doi:10.1051/0004-6361/200912717


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.