HD 68402

HD 68402
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Volans
Right ascension	08h 05m 23.69129s
Declination	−74° 24′ 37.4873″
Apparent magnitude (V)	9.09 ± 0.02
Characteristics
Evolutionary stage	main sequence
Spectral type	G5 IV/V
B−V color index	+0.68
Astrometry
Radial velocity (Rv)	11.60 ± 0.49 km/s
Proper motion (μ)	RA: −78.195 mas/yr ; Dec.: +78.973 mas/yr
Parallax (π)	12.7204±0.0101 mas
Distance	256.4 ± 0.2 ly ; (78.61 ± 0.06 pc)
Absolute magnitude (MV)	+4.66
Details
Mass	1.12 ± 0.05 M☉
Radius	1.02 ± 0.05 R☉
Luminosity	1.17+0.06; −0.07 L☉
Surface gravity (log g)	4.43 ± 0.04 cgs
Temperature	5,907 ± 68 K
Metallicity [Fe/H]	+0.29 ± 0.10 dex
Rotational velocity (v sin i)	2.9 ± 0.2 km/s
Age	1 ± 0.9 Gyr
Other designations
	CD−74°392, CPD−74°486, HD 68402, HIP 39589
Database references
SIMBAD	data
Exoplanet Archive	data

HD 68402 is a solitary star located in the circumpolar constellation Volans. With an apparent magnitude of 9.09, it is invisible to the naked eye but can be seen with an amateur telescope. This star is located at a distance of 256 light years based on its parallax shift but is drifting away at a rate of 11.60 km/s.

HD 68402 has a classification of G5 IV/V, which indicates that it is a G5 star with the characteristics of a subgiant and main-sequence star. Contrary to its classification, it is actually a G1 dwarf. At present it is slightly more massive than the Sun and has a similar radius to the latter. It radiates at 1.17 times the luminosity of the Sun from its photosphere at an effective temperature of 5,907 K, which gives it a yellow hue. At an age of 1 billion years HD 68402 has a projected rotational velocity of almost 3 km/s and is metal rich like most planetary hosts (1.94 times to be exact).

Planetary system

In 2017, a superjovian planet was discovered using doppler spectroscopy data from HARPS and CORALIE. In 2023, the inclination and true mass of HD 68402 b were determined via astrometry.

The HD 68402 planetary system
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (years)	Eccentricity	Inclination (°)	Radius
b	7.9+1.7 −1.5 `M`_J	2.239+0.11 −0.075	3.15+0.22 −0.14	0.225+0.15 −0.082	20.3+6.2 −4.1 or 159.7+4.1 −6.2	—

References

1 2 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. XHIP record for this object at VizieR.
1 2 3 4 5 6 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.
1 2 3 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
1 2 Houk, N.; Cowley, A. P. (1 January 1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
1 2 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.
1 2 3 4 5 6 Jenkins, J. S.; Jones, H. R. A.; Tuomi, M.; Díaz, M.; Cordero, J. P.; Aguayo, A.; Pantoja, B.; Arriagada, P.; Mahu, R.; Brahm, R.; Rojo, P.; Soto, M. G.; Ivanyuk, O.; Becerra Yoma, N.; Day-Jones, A. C.; Ruiz, M. T.; Pavlenko, Y. V.; Barnes, J. R.; Murgas, F.; Pinfield, D. J.; Jones, M. I.; López-Morales, M.; Shectman, S.; Butler, R. P.; Minniti, D. (April 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. ISSN 0035-8711.
1 2 3 4 5 Adibekyan, V.; Santos, N. C.; Demangeon, O. D. S.; Faria, J. P.; Barros, S. C. C.; Oshagh, M.; Figueira, P.; Delgado Mena, E.; Sousa, S. G.; Israelian, G.; Campante, T.; Hakobyan, A. A. (May 2021). "Stellar clustering and orbital architecture of planetary systems". Astronomy & Astrophysics. 649: A111. arXiv:2102.12346. Bibcode:2021A&A...649A.111A. doi:10.1051/0004-6361/202040201. ISSN 0004-6361. S2CID 233707059.
1 2 Xiao, Guang-Yao; Liu, Yu-Juan; et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. 23 (5): 055022. arXiv:2303.12409. Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e. S2CID 257663647.

[XHIP-1] 1 2 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. XHIP record for this object at VizieR.

[GaiaDR3-2] 1 2 3 4 5 6 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.

[Hog2000-3] 1 2 3 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.

[Houk1975-4] 1 2 Houk, N.; Cowley, A. P. (1 January 1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.

[GaiaDR2-5] 1 2 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.

[Jenkins2017-6] 1 2 3 4 5 6 Jenkins, J. S.; Jones, H. R. A.; Tuomi, M.; Díaz, M.; Cordero, J. P.; Aguayo, A.; Pantoja, B.; Arriagada, P.; Mahu, R.; Brahm, R.; Rojo, P.; Soto, M. G.; Ivanyuk, O.; Becerra Yoma, N.; Day-Jones, A. C.; Ruiz, M. T.; Pavlenko, Y. V.; Barnes, J. R.; Murgas, F.; Pinfield, D. J.; Jones, M. I.; López-Morales, M.; Shectman, S.; Butler, R. P.; Minniti, D. (April 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. ISSN 0035-8711.

[Adibekyan2021-7] 1 2 3 4 5 Adibekyan, V.; Santos, N. C.; Demangeon, O. D. S.; Faria, J. P.; Barros, S. C. C.; Oshagh, M.; Figueira, P.; Delgado Mena, E.; Sousa, S. G.; Israelian, G.; Campante, T.; Hakobyan, A. A. (May 2021). "Stellar clustering and orbital architecture of planetary systems". Astronomy & Astrophysics. 649: A111. arXiv:2102.12346. Bibcode:2021A&A...649A.111A. doi:10.1051/0004-6361/202040201. ISSN 0004-6361. S2CID 233707059.

[Xiao2023-8] 1 2 Xiao, Guang-Yao; Liu, Yu-Juan; et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. 23 (5): 055022. arXiv:2303.12409. Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e. S2CID 257663647.