Eta³ Fornacis

η³ Fornacis
	Location of η3 Fornacis (top star inside circle)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Fornax
Right ascension	02h 50m 40.407s
Declination	−35° 40′ 33.06″
Apparent magnitude (V)	5.47
Characteristics
Evolutionary stage	giant
Spectral type	K2III
U−B color index	+1.31
B−V color index	+1.25
Astrometry
Radial velocity (Rv)	13.10±0.12 km/s
Proper motion (μ)	RA: +4.093 mas/yr ; Dec.: −54.551 mas/yr
Parallax (π)	6.6631 ± 0.0580 mas
Distance	489 ± 4 ly ; (150 ± 1 pc)
Absolute magnitude (MV)	−0.26
Details
Mass	3.7 M☉
Radius	21.9 R☉
Luminosity	249 L☉
Surface gravity (log g)	2.27 cgs
Temperature	4,717 K
Metallicity [Fe/H]	0.156 dex
Rotational velocity (v sin i)	<1 km/s
Age	217 Myr
Other designations
	η3 For, CD−36°1070, HD 17829, HIP 13265, HR 848, SAO 193944
Database references
SIMBAD	data

Eta³ Fornacis (η³ Fornacis) is an orange giant in the constellation of Fornax. The star has a spectral type of K2III and an apparent magnitude of 5.47.^[7] The star is visually close to, but unrelated with the similar stars η² Fornacis and η¹ Fornacis.^[7] The star is located at approximately 489 light years away with a luminosity of about 249 L_☉, and is a suspected binary system with the primary being the orange giant.^[8]

References[edit]

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c Hoffleit, D.; Warren, Jr., W. H. (1991). The Bright Star Catalogue (5th Revised ed.). New Haven: Astronomical Data Center, NSSDC/ADC. Bibcode:1964cbs..book.....H.
^ Houk, Nancy; Smith-Moore, M. (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
^ "* eta03 For". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-09-28.
^ ^a ^b "η3 Fornacis (eta3 Fornacis)". The Sky Live. Retrieved 28 September 2023.
^ "Eta3 Fornacis Star Facts (Distance, Colour etc.)". Universe Guide. Retrieved 28 September 2023.

This giant-star-related article is a stub. You can help Wikipedia by expanding it.

[dr3-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[bsc-2] Hoffleit, D.; Warren, Jr., W. H. (1991). The Bright Star Catalogue (5th Revised ed.). New Haven: Astronomical Data Center, NSSDC/ADC. Bibcode:1964cbs..book.....H.

[houk1979-3] Houk, Nancy; Smith-Moore, M. (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.

[xhip-4] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.

[demedeiros2014-5] De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.

[SIMBAD-6] "* eta03 For". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-09-28.

[theskylive-7] "η3 Fornacis (eta3 Fornacis)". The Sky Live. Retrieved 28 September 2023.

[universeguide-8] "Eta3 Fornacis Star Facts (Distance, Colour etc.)". Universe Guide. Retrieved 28 September 2023.

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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of η³ Fornacis (top star inside circle)
Constellation	Fornax
Right ascension	02^h 50^m 40.407^s^[1]
Declination	−35° 40′ 33.06″^[1]
Apparent magnitude (V)	5.47^[2]
Characteristics
Evolutionary stage	giant
Spectral type	K2III^[3]
U−B color index	+1.31^[2]
B−V color index	+1.25^[2]
Astrometry

Radial velocity (R_v)	13.10±0.12^[1] km/s
Proper motion (μ)	RA: +4.093^[1] mas/yr Dec.: −54.551^[1] mas/yr
Parallax (π)	6.6631 ± 0.0580 mas^[1]
Distance	489 ± 4 ly (150 ± 1 pc)
Absolute magnitude (M_V)	−0.26^[4]

Details

Mass	3.7^[1] `M`_☉
Radius	21.9^[1] `R`_☉
Luminosity	249^[1] `L`_☉
Surface gravity (log g)	2.27^[1] cgs
Temperature	4,717^[1] K
Metallicity [Fe/H]	0.156^[1] dex
Rotational velocity (v sin i)	<1^[5] km/s
Age	217^[1] Myr

Other designations
η³ For, CD−36°1070, HD 17829, HIP 13265, HR 848, SAO 193944^[6]
Database references
SIMBAD	data