ADS 16402
Binary star system in the constellation Lacerta
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ADS 16402 is a binary star system, composed of two sun-like stars located approximately 525 light-years away in the constellation Lacerta. It was first identified as a binary star by John Herschel in 1831.[5] The two stars are separated by 11.26 arcseconds which leads to a projected separation of roughly 1500 astronomical units at the distance of ADS 16402. The star system is estimated to be 1.9 ± 0.6 billion years old.[8] The secondary star ADS 16402 B is also designated HAT-P-1.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lacerta[1] |
| ADS 16402 A | |
| Right ascension | 22h 57m 45.9211s[2] |
| Declination | +38° 40′ 27.200″[2] |
| Apparent magnitude (V) | +10.0[3] |
| ADS 16402 B (HAT-P-1) | |
| Right ascension | 22h 57m 46.8442s[4] |
| Declination | +38° 40′ 30.358″[4] |
| Apparent magnitude (V) | +10.4[3] |
| Characteristics | |
| ADS 16402 A | |
| Spectral type | F8[3]/G0V[5] |
| Apparent magnitude (J) | 8.670±0.021[6] |
| Apparent magnitude (H) | 8.467±0.044[6] |
| Apparent magnitude (K) | 8.405±0.020[6] |
| ADS 16402 B (HAT-P-1) | |
| Spectral type | F8[3]/G0V[5] |
| Apparent magnitude (J) | 9.156±0.026[6] |
| Apparent magnitude (H) | 8.923±0.030[6] |
| Apparent magnitude (K) | 8.858±0.018[6] |
| Variable type | planetary transit[5] |
| Astrometry | |
| ADS 16402 A | |
| Radial velocity (Rv) | −3.43 ± 0.32[5] km/s |
| Proper motion (μ) | RA: 32.079(15) mas/yr[2] Dec.: −42.076(18) mas/yr[2] |
| Parallax (π) | 6.2364±0.0164 mas[2] |
| Distance | 523 ± 1 ly (160.3 ± 0.4 pc) |
| Absolute magnitude (MV) | 3.4 ± 0.3[5] |
| ADS 16402 B (HAT-P-1) | |
| Radial velocity (Rv) | −2.94 ± 0.56[5] km/s |
| Proper motion (μ) | RA: 32.422(14) mas/yr[4] Dec.: −41.949(13) mas/yr[4] |
| Parallax (π) | 6.2438±0.0146 mas[4] |
| Distance | 522 ± 1 ly (160.2 ± 0.4 pc) |
| Absolute magnitude (MV) | 3.7 ± 0.3[5] |
| Details | |
| ADS 16402 A | |
| Mass | 1.16 ± 0.11[5] M☉ |
| Radius | 1.123 +0.14 −0.10[5] R☉ |
| Luminosity | 1.82 +0.75 −0.53[5] L☉ |
| Surface gravity (log g) | 4.36 ± 0.03[7] cgs |
| Temperature | 6251 ± 17[7] K |
| Metallicity [Fe/H] | 0.146 ± 0.014[7] dex |
| Rotational velocity (v sin i) | 7.1 ± 0.3[5] km/s |
| Age | 1.9 ± 0.6[8] Gyr |
| ADS 16402 B (HAT-P-1) | |
| Mass | 1.151 +0.052 −0.051[9] M☉ |
| Radius | 1.174 +0.026 −0.027[9] R☉ |
| Luminosity | 1.585 +0.099 −0.094[9] L☉ |
| Surface gravity (log g) | 4.43 ± 0.02[7] cgs |
| Temperature | 6049 ± 8[7] K |
| Metallicity [Fe/H] | 0.155 ± 0.007[7] dex |
| Rotational velocity (v sin i) | 2.2 ± 0.2[5] km/s |
| Age | 1.9 ± 0.6[8] Gyr |
| Position (relative to ADS 16402 A) | |
| Angular distance | 11.26 ± 0.03″ [10] |
| Other designations | |
| BD+37°4734, CCDM J22578+3840, WDS J22578+3840, HJ 1832[11][12] | |
| ADS 16402 A: PPM 88381, 2MASS J22574592+3840272, Gaia DR3 1928431764627661312[11] | |
| ADS 16402 B: HAT-P-1, PPM 88382, 2MASS J22574684+3840302, Gaia DR3 1928431764627661440[12] | |
| Database references | |
| SIMBAD | ADS 16402 |
| ADS 16402 A | |
| HAT-P-1 | |
Planetary system
On September 14, 2006 the HATNet Project announced their first extrasolar planet discovery HAT-P-1b, a hot jupiter type gas giant in orbit around the secondary star ADS 16402B. Following the designation scheme used by the HATNet Project, the secondary star is known as HAT-P-1, and the planet itself designated HAT-P-1b.[5][13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.529 ± 0.020 MJ | 0.05561 ± 0.00083 | 4.4652968 ± 0.0000018 | 0 | 85.634 ± 0.056° | 1.319 ± 0.019 RJ |
See also
- HATNet Project or HAT