HD 48265

HD 48265 / Nosaxa

Observation data Epoch J2000      Equinox J2000
Constellation	Puppis
Right ascension	06^h 40^m 01.7270^s[1]
Declination	−48° 32′ 31.042″[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: 26.524±0.089[1] mas/yr Dec.: 29.689±0.095[1] mas/yr
Parallax (π)	11.14 ± 0.21 mas[1]
Distance	293 ± 6 ly (90 ± 2 pc)
Absolute magnitude (MV)	3.34[6]
Details
Mass	0.93[6] M☉
Radius	2.34 ± 0.26[7] R☉
Luminosity	0.623 ± 0.058[7] L☉
Temperature	5,508[5] K
Metallicity [Fe/H]	0.29 ± 0.05[2] dex
Rotational velocity (v sin i)	3.0[7] km/s
Age	4.8[5] Gyr
Other designations
Nosaxa, CD–48 2430, HD 48265, HIP 31895, SAO 218115.[8]
Database references
SIMBAD	data
Exoplanet Archive	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 293 light-years (90 parsecs) from Earth.[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 yellowish glow of a G-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[10]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b / Naqaỹa	≥1.47±0.12 MJ	1.81±0.07	780.3±4.6	0.08±0.05	—	—

As part of the NameExoWorlds project of the IAU, HD 48265 b has been named Naqaỹa ("brother") and HD 48265 Nosaxa ("springtime") in the Moqoit language, as voted by Argentine voters in an online poll.[11][12]

See also

• List of extrasolar planets

References

1. Brown, A. G. A; et al. (2016), "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties", Astronomy and Astrophysics, 595, A2, arXiv:1609.04172, Bibcode:2016A&A...595A...2G, doi:10.1051/0004-6361/201629512, S2CID 1828208Gaia Data Release 1 catalog entry
2. 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, S2CID 8813298
3. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
4. Cutri, R. M.; et al. (June 2003), 2MASS All Sky Catalog of point sources, NASA/IPAC, Bibcode:2003tmc..book.....C
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, S2CID 11027621
6. 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
7. "HD 48265", NASA Exoplanet Archive, NASA, retrieved 2012-03-15^[permanent dead link‍]
8. "HD 48265". SIMBAD. 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, archived from the original on March 18, 2012, retrieved 2012-01-16
10. Jenkins, J. S.; et al. (2017), "New planetary systems from the Calan–Hertfordshire Extrasolar Planet Search", Monthly Notices of the Royal Astronomical Society, 466 (1): 443–473, arXiv:1603.09391, Bibcode:2017MNRAS.466..443J, doi:10.1093/mnras/stw2811, S2CID 18016219
11. "Argentina", NameExoworlds, retrieved 2019-12-18
12. Javier Salas (2019-12-20), "Rosalía de Castro ya tiene su estrella", El País, retrieved 2020-01-06

External links

• "HD 48265". Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-06-10.