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HD 43848 
Summary
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.
| 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 mas[1] |
| Distance | 123 ± 4 ly (38 ± 1 pc) |
| Details | |
| Mass | 0.94 ± 0.06[2] M☉ |
| Surface gravity (log g) | 4.54 ± 0.04[2] cgs |
| Temperature | 5,161 ± 41[2] K |
| Age | 3.7 ± 1.7[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | 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 edit
References edit
- ^ a b c d e 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, S2CID 18759600
- ^ a b c d e f 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, S2CID 49565866. See table 13.
- ^ 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, S2CID 119417105
- ^ 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, S2CID 119224845
- ^ 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, S2CID 15419641