Star in the constellation Fornax

For other stars with this Bayer designation, see γ Fornacis.

γ2 Fornacis

Location of γ2 Fornacis (circled)

Observation data
Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation | Fornax
Right ascension | 02h 49m 54.1822s[1]
Declination | −27° 56′ 31.123″[1]
Apparent magnitude (V) | 5.389[2]
Characteristics
Evolutionary stage | Main sequence[3]
Spectral type | A1 V[4]
B−V color index | 0.013±0.004[5]
Astrometry
Radial velocity (Rv)| 24.0±4.2[6] km/s
Proper motion (μ)|  RA: −47.053[1] mas/yr
Dec.: 20.932[1] mas/yr
Parallax (π)| 6.3134 ± 0.1330 mas[1]
Distance| 520 ± 10 ly
(158 ± 3 pc)
Absolute magnitude (MV)| −0.35[5]
Details
Mass| 2.40+0.44
−0.38[2] M☉
Radius| 4.488[7] R☉
Luminosity| 117.073±0.111[7] L☉
Surface gravity (log g)| 3.50±0.25[2] cgs
Temperature| 9,000±500[2] K
Metallicity [Fe/H]| −0.02[8] dex
Rotational velocity (v sin i)| 149[3] km/s
Age| 401+138
−170[2] Myr
Other designations

γ2 For, CD−28°903, HD 17729, HIP 13202, HR 845, SAO 168082[9]

Database references
SIMBAD| data

Gamma2 Fornacis, a name Latinized from γ2 Fornacis, is a single[10] star in the southern constellation Fornax. It has a white hue and is faintly visible to the naked eye at night with an apparent visual magnitude of 5.4.[2] The distance to Gamma2 Fornacis is approximately 520 light years based on parallax.[1] It is drifting further away with a radial velocity of 24 km/s.[6] Gamma1 Fornacis is a 6th magnitude star about four degrees to the north.[11]

The stellar classification of Gamma2 Fornacis is A1 V,[4] which is notation for an A-type main-sequence star that, like the Sun, is generating energy through core hydrogen fusion. Comparison of its properties to theoretical models suggest an age of about 400[2] million years old. It has a high rate of spin, showing a projected rotational velocity of 149 km/s.[3] The star has 2.4[2] times the mass of the Sun and 4.5[7] times the Sun's radius. It is radiating 117[7] times the luminosity of the Sun from its photosphere at an effective temperature of roughly 9,000 K.[2]

## References[edit]

1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. ^ a b c d e f g h i Gullikson, Kevin; et al. (2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal. 152 (2): 40. arXiv:1604.06456. Bibcode:2016AJ....152...40G. doi:10.3847/0004-6256/152/2/40. S2CID 119179065.
3. ^ a b c Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789.
4. ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations -40_ƒ0 to -26_ƒ0. Vol. 3\. Bibcode:1982mcts.book.....H.
5. ^ a b 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.
6. ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
7. ^ a b c d McDonald, I.; et al. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433.
8. ^ Anders, F.; et al. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. S2CID 131780028.
9. ^ "gam02 For". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-17.
10. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
11. ^ Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. Vol. 1\. Sky Publishing Corporation and the European Space Agency. p. 381\. ISBN 0-933346-84-0.

* v
* t
* e

Constellation of Fornax

* List of stars in Fornax
* Fornax in Chinese astronomy
* Chandra Deep Field South
* Hubble Legacy Field

Stars|

| Bayer|

* α (Dalim)
* β
* γ1
* γ2
* δ
* ε
* ζ
* ι2
* κ
* λ1
* λ2
* μ
* ν
* π
* φ
* ω

|

Variable|

* R
* UZ

HR|

* 683
* 858

HD|

* 20781
* 20782
* 20868 (Intan)

Other|

* 2MASS J02431371−2453298
* HIP 13044
* LP 944-20
* UDF 2457
* WASP-72 (Diya)

| Exoplanets|

* HD 16417 b
* HD 20781 b
* HD 20781 c
* HD 20782 b
* HD 20868 b (Baiduri)

|

| Star clusters|

* NGC 1049

|

| Nebulae|

* NGC 1360

|

Galaxies|

| NGC|

* 823
* 824
* 922
* 986
* 1097
* 1210
* 1255
* 1288
* 1310
* 1316
* 1317
* 1318
* 1326
* 1350
* 1365
* 1374
* 1375
* 1379
* 1380
* 1381
* 1387
* 1398
* 1399
* 1406
* 1425
* 1427

|

Other|

* Fornax Dwarf
* HUDF-JD2
* IC 335
* IC 1993
* PGC 13809
* UDF 423
* UDFj-39546284
* UDFy-38135539

| Galaxy clusters|

* Fornax Cluster

|

| Astronomical events|

* SN 1992bd
* SN 1999eu
* SN 2003B

|

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
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*[t]: Discuss this template
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