Kepler-1972
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 13m 34.86914s[1] |
| Declination | 39° 52′ 21.4698″[1] |
| Characteristics | |
| Spectral type | G[2] |
| Astrometry | |
| Radial velocity (Rv) | 5.04±0.54[1] km/s |
| Proper motion (μ) | RA: 3.441[1] mas/yr Dec.: −28.778[1] mas/yr |
| Parallax (π) | 3.5329 ± 0.0107[1] mas |
| Distance | 923 ± 3 ly (283.1 ± 0.9 pc) |
| Absolute magnitude (MV) | [3] |
| Details | |
| Mass | 1.12±0.03 M☉ |
| Radius | 1.384±0.050 R☉ |
| Luminosity (bolometric) | 1.97±0.07 L☉ |
| Surface gravity (log g) | 4.20±0.04 cgs |
| Temperature | 5818±50 K |
| Metallicity [Fe/H] | 0.23±0.01 dex |
| Age | 7.4 ± 1.2 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kepler-1972 (KOI-3184) is a solitary G-type star in the northern constellation of Lyra, some 923 light-years (283 pc) distant. It is similar in temperature to the Sun, but 12% more massive, 38.4% larger and roughly twice as bright. It is host to two confirmed exoplanets and a third planet is suspected. It is located at the celestial coordinates: right ascension 19h 13m 34.9s, declination +39° 52′ 21.5″.[1]
Position[edit]
Kepler-1972 is located in the western portion of constellation Lyra, placing it near the southern edge of Kepler's field of view. It is situated 10.6″ west of and 43′36″ north of Eta Lyrae (η Lyrae; Aladfar), a 4th-magnitude B-type subgiant 10 times more massive than the Sun and 19,000 times more luminous, at 1,390 light-years (430 pc) away, which is part of a spectroscopic binary and an optical double.
Stellar characteristics[edit]
| Sun | Kepler-1972 |
|---|---|
|
|
Kepler-1972 is a G-type star at the end of its main sequence lifespan.
It has an apparent magnitude of 11.2[5], making it too dim to be seen from Earth by the naked eye, but observable using a 35 mm aperture telescope[6].
Planetary system[edit]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| .03 (unconfirmed) | — | — | 4.020184 ± 0.000035 | — | 87.25 +1.31 −0.97° |
0.551 ± 0.034 R⊕ |
| b | 2.02 +0.56 −0.62 M⊕ |
— | 7.54425 ± 0.00054 | 0.067 +0.071 −0.040 |
87.62 +0.73 −0.49° |
0.802 +0.042 −0.041 R⊕ |
| c | 2.11 +0.59 −0.65 M⊕ |
— | 11.3295 ± 0.0011 | 0.043 +0.046 −0.028 |
87.13 +0.17 −0.19° |
0.868 +0.051 −0.050 R⊕ |
Kepler-1972 is host to two confirmed planets and at least one additional planetary candidate. All three planets are smaller than Earth.
Size comparison[edit]
The chart below shows an approximate size comparison between the three planets around Kepler-1972 (two confirmed, one candidate), alongside Earth and Mars (3,398.5 km[8]; 0.533 R⊕) for reference.
| Mars | KOI-3184.03 | Kepler-1972b | Kepler-1972c | Earth |
|---|---|---|---|---|
 |
|
|
|
 |
See also[edit]
References[edit]
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Cite error: Invalid
<ref>tag; no text was provided for refs namedGaia DR3 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedEscude2012 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedHolmberg2009 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedSimbad - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedSIMBAD - ↑ North, Gerald; James, Nick (2014). Observing Variable Stars, Novae and Supernovae. Cambridge University Press. p. 24. ISBN 978-1-107-63612-5. Search this book on
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedarxiv - ↑ Seidelmann, P. Kenneth; et al. (2007). "Report of the IAU/IAG Working Group on cartographic coordinates and rotational elements: 2006". Celestial Mechanics and Dynamical Astronomy. 98 (3): 155–180. Bibcode:2007CeMDA..98..155S. doi:10.1007/s10569-007-9072-y.
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