Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lyra [2] |
Right ascension | 19h 04m 09.8516s [3] |
Declination | +36° 37′ 57.447″ [3] |
Apparent magnitude (V) | +11.806 [4] |
Characteristics | |
Spectral type | K0V [5] |
Apparent magnitude (B) | 12.405±0.005 [4] |
Apparent magnitude (J) | 10.294±0.022 [6] |
Apparent magnitude (H) | 9.887±0.021 [6] |
Apparent magnitude (K) | 9.819±0.019 [6] |
Variable type | Planetary transit [5] [7] |
Astrometry | |
Radial velocity (Rv) | −20.54±0.40 [3] km/s |
Proper motion (μ) | RA: −32.168(12) mas/yr [3] Dec.: −20.463(13) mas/yr [3] |
Parallax (π) | 6.2648±0.0111 mas [3] |
Distance | 520.6 ± 0.9 ly (159.6 ± 0.3 pc) |
Absolute magnitude (MV) | +5.847+0.097 −0.095 [8] |
Details [8] | |
Mass | 0.878+0.038 −0.040 M☉ |
Radius | 0.807+0.017 −0.016 R☉ |
Luminosity | 0.438+0.035 −0.033 L☉ |
Surface gravity (log g) | 4.567+0.012 −0.015 cgs |
Temperature | 5230±50 K |
Metallicity [Fe/H] | +0.02±0.05 dex |
Rotational velocity (v sin i) | 1.30±0.30 [9] km/s |
Age | 3.7+3.4 −2.8 Gyr |
Other designations | |
TrES-1 Parent Star, V672 Lyr , KIC 875283, TOI-1236, TIC 120757718, TYC 2652-1324-1, GSC 02652-01324, 2MASS J19040985+3637574 [10] | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
GSC 02652-01324, also known as V672 Lyrae, is an orange dwarf main sequence star approximately 521 light-years away in the constellation of Lyra (the Lyre). [2] [3] It hosts one known exoplanet, TrES-1b. [5]
There is a small, cool companion star at a separation of 13.2 arcseconds, corresponding to 2111 AU. [11]
The designation GSC 02652-01324 comes from the Guide Star Catalog.
The star is sometimes called TrES-1, [12] in reference to its planet discovered by the Trans-Atlantic Exoplanet Survey (TrES). The discovery paper [5] and the SIMBAD database [10] use this designation for the planet itself, but other sources call the star TrES-1 [13] and the planet TrES-1b, [14] following the standard exoplanet naming convention.
Since the planet transits the star, the star is classified as a planetary transit variable and has received the variable star designation V672 Lyrae. The transits last a little over an hour, about 4% of the orbital period, and the brightness diminishes by a few hundredths of a magnitude. [7]
In 2004, the exoplanet TrES-1b was found to be orbiting this star by the Trans-Atlantic Exoplanet Survey using the transit method. The planet was detected crossing its parent star using a small 4-inch-diameter (100 mm) telescope. The discovery was confirmed by the Keck Observatory using the radial velocity method, allowing its mass to be determined. [5] [15] The planet is a hot Jupiter, with a mass and size similar to those of Jupiter but an orbital period of only three days.
Additional planets in the system are suspected due to transit-timing variations of TrES-1b. [14]
Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.697+0.028 −0.027 MJ | 0.03926+0.00058 −0.00060 | 3.0300689(7) [14] | <0.012 | 90.0+0.0 −1.1 ° | 1.067+0.022 −0.021 RJ |