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GJ 3470 is a red dwarf star located in the constellation of Cancer, 30 parsecs away from Earth.[4]

Gliese 3470
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer[1]
Right ascension 07h 59m 05.8395618539s[2]
Declination 15° 23′ 29.240025256″[2]
Apparent magnitude (V) 12.330[3]
Characteristics
Evolutionary stage Main sequence red dwarf
Spectral type M2.0Ve[2]
Apparent magnitude (B) 13.5[2]
Apparent magnitude (V) 12.330[3]
Apparent magnitude (R) 11.934[2]
Apparent magnitude (J) 8.794[2]
Apparent magnitude (H) 8.206[2]
Apparent magnitude (K) 7.989[2]
B−V color index 1.17
V−R color index 0.396
J−H color index 0.588
J−K color index 0.217
Astrometry
Radial velocity (Rv)26.341±0.0038[2] km/s
Proper motion (μ) RA: -185.734[2] mas/yr
Dec.: -57.263[2] mas/yr
Parallax (π)33.9601 ± 0.0582 mas[2]
Distance96.0 ± 0.2 ly
(29.45 ± 0.05 pc)
Details[3]
Mass0.539+0.047
−0.043 M☉
Radius0.547±0.018 R☉
Surface gravity (log g)4.695±0.046 cgs
Temperature3600±100 K
Metallicity [Fe/H]0.20±0.10 dex
Other designations
GJ 3470, LP 424-4, NLTT 18739, 2MASS J07590587+1523294[2]
Database references
SIMBADdata
Exoplanet Archivedata

Properties


The star has a mass of 0.539 solar masses and a radius of 0.547 solar radii.[3] It is 1.6 billion years old, with a metallicity of 0.2 Fe/H.[5] The star exhibits a strong stellar activity, with three ultraviolet flares detected by 2021.[6]


Planetary system


At least one exoplanet has been discovered orbiting at the distance of 0.031 astronomical units. The exoplanet, which is called GJ 3470 b, is a mini-Neptune with an orbital period of 3.3 days.[7]

In July 2020, a group of amateur astronomers reported a new exoplanet candidate, which they hypothesize to be the size of Saturn and inside the system's habitable zone, along with twelve tentative transits from not yet characterized exoplanets in the same star system.[8][9] If confirmed, GJ 3470 c would become the second exoplanet discovered by amateur astronomers, after KPS-1b, an exoplanet discovered by Ural State Technical University using amateur data.[10] The new GJ 3470 candidate was discovered with amateur data and through a project led by amateur astronomers.[8][11] [12][13][14][15][16] However, it is important to note that the study in question has not been published in any scientific journal, nor has it been peer reviewed.

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[17]

The Gliese 3470 planetary system[7][8]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 12.57±1.3 M🜨 0.031± 3.3366487+0.0000043
−0.0000033		 0.114±0.052 88.88+0.62
−0.45°		 4.199±0.58 R🜨
c (unconfirmed) — 0.25 66 — — 9.2 R⊕

See also



References


  1. Staff (2 August 2008). "Finding the constellation which contains given sky coordinates". DJM.cc. Retrieved 16 July 2020.
  2. "LP 424-4 -- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 16 July 2020.
  3. "GJ 3470". NASA Exoplanet Archive. Retrieved 16 July 2020.
  4. "GJ 3470". www.exoplanetkyoto.org. Retrieved 2020-07-16.
  5. "The Extrasolar Planet Encyclopaedia — GJ 3470 b". exoplanet.eu. Retrieved 2020-07-16.
  6. Bourrier, V.; Dos Santos, L. A.; Sanz-Forcada, J.; García Muñoz, A.; Henry, G. W.; Lavvas, P.; Lecavelier, A.; López-Morales, M.; Mikal-Evans, T.; Sing, D. K.; Wakeford, H. R.; Ehrenreich, D. (2021), "The Hubble PanCET program: Long-term chromospheric evolution and flaring activity of the M dwarf host GJ 3470", Astronomy & Astrophysics, 650: A73, arXiv:2103.09864, doi:10.1051/0004-6361/202140487, S2CID 232269667
  7. Bonfils, Xavier; et al. (28 September 2012). "A hot Uranus transiting the nearby M dwarf GJ3470. Detected with HARPS velocimetry. Captured in transit with TRAPPIST photometry". Astronomy & Astrophysics. 546: 8. arXiv:1206.5307. Bibcode:2012A&A...546A..27B. doi:10.1051/0004-6361/201219623. S2CID 12963626.
  8. Scott, Phillip; Walter, Bradley; Ye, Quanzhi; Mitchell, David; Heiland, Leo; Gao, Xing; Palado, Alejandro; Otabek, Burkhonov; Casal, Jesus Delgado; Hill, Colin; Garcia, Alberto (2020-07-14). "GJ 3470 c: A Saturn-like Exoplanet Candidate in the Habitable Zone of GJ 3470". arXiv:2007.07373 [astro-ph.EP].
  9. "The Extrasolar Planet Encyclopaedia — GJ 3470 c". exoplanet.eu. Retrieved 2020-07-16.
  10. Burdanov, Artem; et al. (July 2018). "KPS-1b: The First Transiting Exoplanet Discovered Using an Amateur Astronomer's Wide-field CCD Data". Publications of the Astronomical Society of the Pacific. 130 (989): 074401. arXiv:1804.05551. Bibcode:2018PASP..130g4401B. doi:10.1088/1538-3873/aabde2. S2CID 55382183.
  11. Carter, Jamie. "Inside The 24/7 Search For Another Habitable Planet Within 100 Light Years Of Earth". Forbes. Retrieved 2020-07-19.
  12. Maloney, Dan (2020-07-19). "Hackaday Links: July 19, 2020". Hackaday. Retrieved 2020-07-20.{{cite web}}: CS1 maint: url-status (link)
  13. "Saturn-Like Exoplanet Found in Habitable Zone of Gliese 3470 | Astronomy | Sci-News.com". Breaking Science News | Sci-News.com. Retrieved 2020-07-21.
  14. Beaty, James. "Local astronomer says he's detected new planet". McAlester News-Capital. Retrieved 2020-07-22.
  15. "Amateur-team spoort (mogelijke) nieuwe exoplaneet op - Astronomie.nl". www.astronomie.nl. Retrieved 2020-07-24.
  16. Andy Tomaswick (2020-07-28). "Saturn-sized Planet Found in the Habitable Zone of Another Star. The First Planet Completely Discovered by Amateur Astronomers". Universe Today. Retrieved 2020-07-29.
  17. "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.

На других языках

- [en] Gliese 3470

[ru] Глизе 3470

Глизе 3470 — звезда в созвездии Рака. Находится на расстоянии ок. 100 световых лет (30 парсек) от Солнца.


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