ADS 16402
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Lacerta |
| ADS 16402 A | |
| Right ascension | 22h 57m 45.919s |
| Declination | +38° 40′ 27.19″ |
| Apparent magnitude (V) | +10.0 |
| ADS 16402 B (HAT-P-1) | |
| Right ascension | 22h 57m 46.844s |
| Declination | +38° 40′ 30.33″ |
| Apparent magnitude (V) | +10.4 |
| Characteristics | |
| ADS 16402 A | |
| Spectral type | F8/G0V |
| ADS 16402 B (HAT-P-1) | |
| Spectral type | F8/G0V |
| Astrometry | |
| ADS 16402 A | |
| Radial velocity (Rv) | −3.43 ± 0.32 km/s |
| Proper motion (μ) |
RA: 29.9 ± 0.6 mas/yr Dec.: −42.5 ± 1.2 mas/yr |
| Distance | 450+72 −62 ly (139 +22 −19pc) |
| 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: 32.7 ± 0.8 mas/yr Dec.: −43.2 ± 1.9 mas/yr |
| Distance | 450+72 −62 ly (139 +22 −19pc) |
| 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, PPM 88381 | |
| ADS 16402 B: HAT-P-1, BD+37° 4734s, PPM 88382 | |
| Database references | |
| SIMBAD | ADS 16402 |
| ADS 16402 A | |
| HAT-P-1 | |
ADS 16402 is a binary star system, composed of two sun-like stars located 450 light-years away in the constellation Lacerta. It was first identified by John Herschel in 1831. The two stars are separated by 1500 AUs. 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.
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.
Coordinates: 
22h 57m 47s, +38° 40′ 30″
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