astro.wikisort.org - StarHIP 70849 is a star with one or more non-stellar companions in the southern constellation Lupus. It is a 10th magnitude star, making it too faint to be visible to the naked eye.[2] The system is located at a distance of 78.5 light-years from the Sun based on parallax measurements.[1]
Star in the constellation Lupus
HIP 70849
Observation data Epoch J2000.0 Equinox J2000.0 |
Constellation |
Lupus |
Right ascension |
14h 29m 18.564s[1] |
Declination |
−46° 27′ 49.74″[1] |
Apparent magnitude (V) |
10.36[2] |
Characteristics |
Spectral type |
K7Vk[3] |
Apparent magnitude (B) |
11.787[2] |
Apparent magnitude (J) |
7.639±0.023[2] |
Apparent magnitude (H) |
7.006±0.061[2] |
Apparent magnitude (K) |
6.790±0.027[2] |
B−V color index |
1.427±0.019[2] |
Variable type |
8.50[2] |
Astrometry |
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|
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Radial velocity (Rv) | −0.134±0.0013[4] km/s |
Proper motion (μ) | RA: −43.981 mas/yr[1] Dec.: −201.760 mas/yr[1] |
Parallax (π) | 41.5387 ± 0.0424 mas[1] |
Distance | 78.52 ± 0.08 ly (24.07 ± 0.02 pc) |
Absolute magnitude (MV) | 8.5[2] |
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Details |
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Mass | 0.63±0.03[5] 0.76±0.07[6] M☉ |
Radius | 0.62±0.02[5] R☉ |
Luminosity (bolometric) | 0.0892±0.0005[5] L☉ |
Surface gravity (log g) | 3.70±0.09[6] cgs |
Temperature | 4,103±25[6] K |
Metallicity [Fe/H] | 0.00±0.03[6] dex |
Rotation | 41.2 d[5] |
Rotational velocity (v sin i) | 1.93 km/s[5] 0.30±0.30[6] km/s |
Age | 3.6±0.15[5] Gyr |
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Other designations |
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NSV 6678, CD−45°9206, GJ 550.3, HIP 70849, PPM 760399, LTT 5717, NLTT 37446 [7] |
Database references |
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SIMBAD | data |
Exoplanet Archive | data |
Extrasolar Planets Encyclopaedia | data |
This is a K-type main-sequence star with a stellar classification of K7Vk,[3] where the 'k' indicates interstellar absorption features in the spectrum. The star is magnetically active with a 10.1±1.4 yr starspot cycle. It appears about 3.6 billion years old and the light emission shows a 41.2 day periodicity, which is likely the rotation period.[5] This star, which resembles a brighter red dwarf, is smaller and less massive than the Sun. It is radiating just 9%[5] of the luminosity of the Sun from its photosphere at an effective temperature of 4,103 K.[6]
In 2009, a gas giant planet/brown dwarf was found in orbit around it. Designated HIP 70849 b it has more than five times the mass of Jupiter and takes more than 3000 days to orbit at a semimajor axis of more than 3.5 AU.[8] There is also a potential T4.5 brown dwarf companion orbiting ~9000AU from HIP 70849.[9]
The HIP 70849 planetary system[8]
Companion (in order from star) |
Mass |
Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
Inclination |
Radius |
b |
>5 MJ |
>3.5 |
>3000 |
? |
— |
— |
See also
- List of extrasolar planets
References
- 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.
- 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.
- Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
- Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
- Zurlo, A.; et al. (October 2018). "Imaging radial velocity planets with SPHERE". Monthly Notices of the Royal Astronomical Society. 480 (1): 35–48. arXiv:1807.01324. Bibcode:2018MNRAS.480...35Z. doi:10.1093/mnras/sty1809.
- Sousa, S. G.; et al. (November 2018). "SWEET-Cat updated. New homogenous spectroscopic parameters". Astronomy & Astrophysics. 620: 13. arXiv:1810.08108. Bibcode:2018A&A...620A..58S. doi:10.1051/0004-6361/201833350. S2CID 119374557. A58.
- "CD-45 9206". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-11.
- Ségransan, D.; et al. (2011). "The HARPS search for southern extra-solar planets. XXIX. Four new planets in orbit around the moderately active dwarfs HD 63765, HD 104067, HD 125595, and HIP 70849". Astronomy and Astrophysics. 535. A54. arXiv:1107.0339. Bibcode:2011A&A...535A..54S. doi:10.1051/0004-6361/200913580. S2CID 119197766.
- Lodieu, N.; et al. (2014). "Binary frequency of planet-host stars at wide separations. A new brown dwarf companion to a planet-host star". Astronomy and Astrophysics. 569. A120. arXiv:1408.1208. Bibcode:2014A&A...569A.120L. doi:10.1051/0004-6361/201424210. S2CID 118516214.
Constellation of Lupus |
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|
Stars | Bayer | |
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Flamsteed | |
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Variable | |
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HR |
- 5362
- 5364
- 5377
- 5380
- 5401
- 5412
- 5413
- 5426
- 5427
- 5444
- 5450 (a)
- 5457
- 5458
- 5494
- 5495 (b)
- 5498
- 5509
- 5556 (c)
- 5559
- 5566
- 5580
- 5595
- 5607
- 5615
- 5617
- 5625
- 5636
- 5637
- 5642
- 5650
- 5651 (e)
- 5653
- 5663
- 5667
- 5668
- 5682
- 5688
- 5689
- 5696
- 5724 (k)
- 5736
- 5738
- 5742
- 5751
- 5753
- 5767
- 5773
- 5784
- 5790
- 5807
- 5821
- 5822
- 5825 (g)
- 5837 (h)
- 5846
- 5860
- 5862
- 5864
- 5893
- 5916
- 5918
- 5923
- 5929
- 5935
- 5943
- 5952
- 5956
- 5967
- 5970
- 5974
- 5975
- 5991
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HD |
- 125809
- 126093
- 126525
- 126759
- 128154
- 129624
- 133399
- 133469
- 133518
- 135430
- 135468
- 136607
- 137785
- 137919
- 138395
- 142527
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Other | |
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 Category |
На других языках
- [en] HIP 70849
[ru] HIP 70849
HIP 70849 — одиночная звезда в созвездии Волка. Находится на расстоянии приблизительно 78,5 световых лет (около 24,1 парсеков) от Солнца.
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