Delta Fornacis

δ Fornacis
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Fornax
Right ascension	03^h 42^m 14.90238^s^[1]
Declination	−31° 56′ 18.0961″^[1]
Apparent magnitude (V)	5.00^[2]
Characteristics
Spectral type	B5 III^[3]
U−B color index	−0.60^[2]
B−V color index	−0.16^[2]
Astrometry

Radial velocity (R_v)	+26.00^[4] km/s
Proper motion (μ)	RA: +4.942^[1] mas/yr Dec.: +13.326^[1] mas/yr
Parallax (π)	4.1125 ± 0.2114 mas^[1]
Distance	790 ± 40 ly (240 ± 10 pc)
Absolute magnitude (M_V)	−2.07^[5]

Details

Mass	5.9±0.2^[6] `M`_☉
Radius	6.0^[7] `R`_☉
Luminosity	1,291^[8] `L`_☉
Temperature	16,230±930^[9] K
Rotational velocity (v sin i)	185^[10] km/s
Age	63.1±16.1^[6] Myr

Other designations
δ For, CD−32° 1430, FK5 133, HD 23227, HIP 17304, HR 1134, SAO 194467^[11]
Database references
SIMBAD	data

Delta Fornacis, Latinized from δ Fornacis, is a solitary,^[12] blue-white hued star near the middle of the southern constellation of Fornax. With an apparent visual magnitude of 5.00,^[2] it is faintly visible to the naked eye at night. The star has an annual parallax shift of 4.1 mas,^[1] indicating it lies at a distance of approximately 790 light years from the Sun. It is drifting further away with a radial velocity of +26 km/s.^[4]

The stellar classification of Delta Fornacis is B5 III,^[3] matching an evolved B-type giant star. It has an angular diameter of 0.215±0.015 mas,^[9] which, at the estimated distance of the star, yields a physical size of around 6 times the radius of the Sun.^[7] Around 63 million years old,^[6] the star is spinning rapidly with a projected rotational velocity of 185 km/s.^[10] It has an estimated 5.9^[6] times the Sun's mass and radiates 1,291^[8] times the solar luminosity from its outer atmosphere at an effective temperature of 16,230 K.^[9]

References

^ ^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.
^ ^a ^b ^c ^d Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1999), "UBVRIJKL photometry of the bright stars", Commission Lunar and Planetary Laboratory, 4: 99, Bibcode:1966CoLPL...4...99J.
^ ^a ^b Houk, N. (1982), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
^ ^a ^b Kharchenko, N. V.; et al. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten, 328 (9): 889, arXiv:0705.0878, Bibcode:2007AN....328..889K, doi:10.1002/asna.200710776, S2CID 119323941.
^ 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.
^ ^a ^b ^c ^d Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
^ ^a ^b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(259.7\cdot 0.215\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 12.0\cdot R_{\bigodot }\end{aligned}}$
^ ^a ^b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
^ ^a ^b ^c Zorec, J.; et al. (2009), "Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff", Astronomy and Astrophysics, 501 (1): 297–320, arXiv:0903.5134, Bibcode:2009A&A...501..297Z, doi:10.1051/0004-6361/200811147, S2CID 14969137.
^ ^a ^b Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
^ "del For". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-17.
^ 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.

Constellation of Fornax

Stars

Bayer	α (Dalim) β γ¹ γ² δ ε ζ η² η³ 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 c d e 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 4627
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

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References