Astronomy:Gliese 3470
| Observation data 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[2] mas |
| 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]
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]
| 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. http://djm.cc/constellation.html. Retrieved 16 July 2020.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 "LP 424-4 -- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=GJ+3470. Retrieved 16 July 2020.
- ↑ 3.0 3.1 3.2 3.3 "GJ 3470". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=GJ+3470. Retrieved 16 July 2020.
- ↑ "GJ 3470". http://www.exoplanetkyoto.org/exohtml/GJ_3470.html.
- ↑ "The Extrasolar Planet Encyclopaedia — GJ 3470 b". http://exoplanet.eu/catalog/gj_3470_b/.
- ↑ Bourrier, V.; Dos Santos, L. A.; Sanz-Forcada, J.; García Muñoz, A.; Henry, G. W.; Lavvas, P.; Lecavelier, A.; López-Morales, M. et al. (2021), "The Hubble PanCET program: Long-term chromospheric evolution and flaring activity of the M dwarf host GJ 3470", Astronomy & Astrophysics 650: A73, doi:10.1051/0004-6361/202140487
- ↑ 7.0 7.1 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. doi:10.1051/0004-6361/201219623. Bibcode: 2012A&A...546A..27B. http://orbi.ulg.ac.be/jspui/handle/2268/135085.[yes|permanent dead link|dead link}}]
- ↑ 8.0 8.1 8.2 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". http://exoplanet.eu/catalog/gj_3470_c/.
- ↑ Burdanov, Artem (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. doi:10.1088/1538-3873/aabde2. Bibcode: 2018PASP..130g4401B.
- ↑ Carter, Jamie. "Inside The 24/7 Search For Another Habitable Planet Within 100 Light Years Of Earth" (in en). https://www.forbes.com/sites/jamiecartereurope/2019/11/25/inside-the-247-search-for-another-habitable-planet-within-100-light-years-of-earth/.
- ↑ Maloney, Dan (2020-07-19). "Hackaday Links: July 19, 2020" (in en-US). https://hackaday.com/2020/07/19/hackaday-links-july-19-2020/.
- ↑ "Saturn-Like Exoplanet Found in Habitable Zone of Gliese 3470 | Astronomy | Sci-News.com" (in en-US). http://www.sci-news.com/astronomy/saturn-like-exoplanet-habitable-zone-gliese-3470-08658.html.
- ↑ Beaty, James. "Local astronomer says he's detected new planet" (in en). https://www.mcalesternews.com/news/local_news/local-astronomer-says-hes-detected-new-planet/article_5fc5acb6-bc82-5441-960a-da28ce290c5b.html.
- ↑ "Amateur-team spoort (mogelijke) nieuwe exoplaneet op - Astronomie.nl". https://www.astronomie.nl/nieuws/amateur-team-spoort-mogelijke-nieuwe-exoplaneet-op-2404.
- ↑ Andy Tomaswick (2020-07-28). "Saturn-sized Planet Found in the Habitable Zone of Another Star. The First Planet Completely Discovered by Amateur Astronomers" (in en-US). https://www.universetoday.com/147231/saturn-sized-planet-found-in-the-habitable-zone-of-another-star-the-first-planet-completely-discovered-by-amateur-astronomers/.
- ↑ "List of ExoWorlds 2022". IAU. 8 August 2022. https://www.nameexoworlds.iau.org/2022exoworlds.
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