ADS 16402
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. 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. The secondary star ADS 16402 B is also designated HAT-P-1.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lacerta |
| ADS 16402 A | |
| Right ascension | 22h 57m 45.9211s |
| Declination | +38° 40′ 27.200″ |
| Apparent magnitude (V) | +10.0 |
| ADS 16402 B (HAT-P-1) | |
| Right ascension | 22h 57m 46.8442s |
| Declination | +38° 40′ 30.358″ |
| Apparent magnitude (V) | +10.4 |
| Characteristics | |
| ADS 16402 A | |
| Spectral type | F8/G0V |
| Apparent magnitude (J) | 8.670±0.021 |
| Apparent magnitude (H) | 8.467±0.044 |
| Apparent magnitude (K) | 8.405±0.020 |
| ADS 16402 B (HAT-P-1) | |
| Spectral type | F8/G0V |
| Apparent magnitude (J) | 9.156±0.026 |
| Apparent magnitude (H) | 8.923±0.030 |
| Apparent magnitude (K) | 8.858±0.018 |
| Variable type | planetary transit |
| Astrometry | |
| ADS 16402 A | |
| Radial velocity (Rv) | −3.43 ± 0.32 km/s |
| Proper motion (μ) | RA: 32.079(15) mas/yr Dec.: −42.076(18) mas/yr |
| Parallax (π) | 6.2364 ± 0.0164 mas |
| Distance | 523 ± 1 ly (160.3 ± 0.4 pc) |
| Absolute magnitude (MV) | 3.4 ± 0.3 |
| ADS 16402 B (HAT-P-1) | |
| Radial velocity (Rv) | −2.94 ± 0.56 km/s |
| Proper motion (μ) | RA: 32.422(14) mas/yr Dec.: −41.949(13) mas/yr |
| Parallax (π) | 6.2438 ± 0.0146 mas |
| Distance | 522 ± 1 ly (160.2 ± 0.4 pc) |
| Absolute magnitude (MV) | 3.7 ± 0.3 |
| Details | |
| ADS 16402 A | |
| Mass | 1.16 ± 0.11 M☉ |
| Radius | 1.123 +0.14 −0.10 R☉ |
| Luminosity | 1.82 +0.75 −0.53 L☉ |
| Surface gravity (log g) | 4.36 ± 0.03 cgs |
| Temperature | 6251 ± 17 K |
| Metallicity [Fe/H] | 0.146 ± 0.014 dex |
| Rotational velocity (v sin i) | 7.1 ± 0.3 km/s |
| Age | 1.9 ± 0.6 Gyr |
| ADS 16402 B (HAT-P-1) | |
| Mass | 1.151 +0.052 −0.051 M☉ |
| Radius | 1.174 +0.026 −0.027 R☉ |
| Luminosity | 1.585 +0.099 −0.094 L☉ |
| Surface gravity (log g) | 4.43 ± 0.02 cgs |
| Temperature | 6049 ± 8 K |
| Metallicity [Fe/H] | 0.155 ± 0.007 dex |
| Rotational velocity (v sin i) | 2.2 ± 0.2 km/s |
| Age | 1.9 ± 0.6 Gyr |
| Position (relative to ADS 16402 A) | |
| Angular distance | 11.26 ± 0.03″ |
| Other designations | |
| ADS 16402 A: BD+37 4734p, Gaia DR3 1928431764627661312, PPM 88381, 2MASS J22574592+3840272 | |
| ADS 16402 B: HAT-P-1, BD+37° 4734s, Gaia DR3 1928431764627661440, PPM 88382, 2MASS J22574684+3840302 | |
| Database references | |
| SIMBAD | ADS 16402 |
| ADS 16402 A | |
| HAT-P-1 | |
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