GJ 3470
GJ 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] |
| Distance | 96.0 ± 0.2 ly (29.45 ± 0.05 pc) |
| Details[3] | |
| Mass | 0.539+0.047 −0.043 M☉ |
| Radius | 0.547±0.018 R☉ |
| Surface gravity (log g) | 4.695±0.046 cgs |
| Temperature | 3600±100 K |
| Metallicity [Fe/H] | 0.20±0.10 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
GJ 3470 is a red dwarf star located in the constellation of Cancer, 30 parsecs away from Earth.[4]
History
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]
Planetary system
At least one exoplanet has been discovered orbiting at the distance of 0.031 astronomical units.[6]
The exoplanet, which is called GJ 3470 b, is a mini-Neptune with an orbital period of 3.3 days.[6]
In July 2020, a group of amateur astronomers reported a new exoplanet candidate, which is the size of Saturn and inside the system's habitable zone, along with twelwe tentative transits from not yet characterized exoplanets in same star system.[7][8] 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.[9] The new GJ 3470 candidate was discovered with amateur data and through a project led by amateur astronomers.[7][10][11][12][13][14][15]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.
| 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
- ^ Staff (2 August 2008). "Finding the constellation which contains given sky coordinates". DJM.cc. Retrieved 16 July 2020.
- ^ a b c d e f g h i j k l m "LP 424-4 -- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 16 July 2020.
- ^ a b c d "GJ 3470". NASA Exoplanet Archive. Retrieved 16 July 2020.
- ^ "GJ 3470". www.exoplanetkyoto.org. Retrieved 2020-07-16.
- ^ "The Extrasolar Planet Encyclopaedia — GJ 3470 b". exoplanet.eu. Retrieved 2020-07-16.
- ^ a b c Bonfils, X.; Gillon, Michaël; Udry, S.; Armstrong, D.; Bouchy, F.; Delfosse, X.; Forveille, T.; Fumel, Aurélie; Jehin, Emmanuel; Lendl, M.; Lovis, C. (2012-10-01). "A hot Uranus transiting the nearby M dwarf GJ 3470. Detected with HARPS velocimetry. Captured in transit with TRAPPIST photometry". Astronomy and Astrophysics. 546: A27. arXiv:1206.5307. Bibcode:2012A&A...546A..27B. doi:10.1051/0004-6361/201219623. ISSN 0004-6361.
- ^ a b c 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].
- ^ "The Extrasolar Planet Encyclopaedia — GJ 3470 c". exoplanet.eu. Retrieved 2020-07-16.
- ^ 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.
- ^ Carter, Jamie. "Inside The 24/7 Search For Another Habitable Planet Within 100 Light Years Of Earth". Forbes. Retrieved 2020-07-19.
- ^ Maloney, Dan (2020-07-19). "Hackaday Links: July 19, 2020". Hackaday. Retrieved 2020-07-20.
{{cite web}}: CS1 maint: url-status (link) - ^ "Saturn-Like Exoplanet Found in Habitable Zone of Gliese 3470 | Astronomy | Sci-News.com". Breaking Science News | Sci-News.com. Retrieved 2020-07-21.
- ^ Editor, James Beaty Managing. "Local astronomer says he's detected new planet". McAlester News-Capital. Retrieved 2020-07-22.
{{cite web}}:|last=has generic name (help) - ^ "Amateur-team spoort (mogelijke) nieuwe exoplaneet op - Astronomie.nl". www.astronomie.nl. Retrieved 2020-07-24.
- ^ 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.
