ADS 16402

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title: "ADS 16402" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["binary-stars", "g-type-main-sequence-stars", "lacerta", "planetary-transit-variables", "planetary-systems-with-one-confirmed-planet", "f-type-main-sequence-stars", "multi-star-planetary-systems"] description: "Binary star system in the constellation Lacerta" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/ADS_16402" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Binary star system in the constellation Lacerta ::

| name = ADS 16402 | epoch = J2000.0 | constell = Lacerta | component1 = ADS 16402 A | ra1 = | dec1 = | appmag_v1 = +10.0 | component2 = ADS 16402 B (HAT-P-1) | ra2 = | dec2 = | appmag_v2 = +10.4 | component = ADS 16402 A | class = F8/G0V | appmag_1_passband = J | appmag_1 = | appmag_2_passband = H | appmag_2 = | appmag_3_passband = K | appmag_3 = | component = ADS 16402 B (HAT-P-1) | class = F8/G0V | appmag_1_passband = J | appmag_1 = | appmag_2_passband = H | appmag_2 = | appmag_3_passband = K | appmag_3 = | variable = planetary transit | component1 = ADS 16402 A | radial_v = −3.43 ± 0.32 | prop_mo_ra = | prop_mo_dec = | pm_footnote = | parallax = 6.2364 | p_error = 0.0164 | parallax_footnote = | absmag_v = 3.4 ± 0.3 | component2 = ADS 16402 B (HAT-P-1) | radial_v2 = −2.94 ± 0.56 | prop_mo_ra2 = | prop_mo_dec2 = | pm_footnote2 = | parallax2 = 6.2438 | p_error2 = 0.0146 | parallax_footnote2 = | absmag_v2 = 3.7 ± 0.3 | component1 = ADS 16402 A | mass = 1.16 ± 0.11 | radius = 1.123 | luminosity = 1.82 | temperature = 6251 ± 17 | metal_fe = 0.146 ± 0.014 | age_gyr = 1.9 ± 0.6 | gravity = 4.36 ± 0.03 | rotational_velocity = 7.1 ± 0.3 | component2 = ADS 16402 B (HAT-P-1) | mass2 = 1.151 | radius2 = 1.174 | luminosity2 = 1.585 | temperature2 = 6049 ± 8 | metal2_fe = 0.155 ± 0.007 | gravity2 = 4.43 ± 0.02 | age_gyr2 = 1.9 ± 0.6 | rotational_velocity2 = 2.2 ± 0.2 | reference = | epoch = | primary = ADS 16402 A | component = | angdistsec = 11.26 ± 0.03 | angdistmas = | angdistref = | posang = | posangref = | projsep = | projsepref = | names = | component1 = ADS 16402 A | names1 = | component2 = ADS 16402 B | names2 = | Simbad = ADS+16402 | sn=ADS 16402 | Simbad2 = ADS+16402+A | sn2=ADS 16402 A | Simbad3=ADS+16402+B | sn3=HAT-P-1 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.

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.

| name = HAT-P-1 | table_ref = | exoplanet = b | mass = 0.529 ± 0.020 | radius = 1.319 ± 0.019 | period = 4.4652968 ± 0.0000018 | semimajor = 0.05561 ± 0.00083 | eccentricity = 0 | inclination = 85.634 ± 0.056

References

References

1. (2007). "HAT-P-1b: A Large-Radius, Low-Density Exoplanet Transiting One Member of a Stellar Binary". The Astrophysical Journal.
2. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics.
3. (September 14, 2006). "Strange New Planet Baffles Astronomers". [[Harvard–Smithsonian Center for Astrophysics]].
4. (2013). "Lucky imaging of transiting planet host stars with LuckyCam". Monthly Notices of the Royal Astronomical Society.
5. {{Cite Gaia DR3. 1928431764627661312
6. {{Cite Gaia DR3. 1928431764627661440
7. (2014). "A high-precision chemical abundance analysis of the HAT-P-1 stellar binary: constraints on planet formation". Monthly Notices of the Royal Astronomical Society.
8. (2014). "Hubble Space Telescope hot Jupiter transmission spectral survey: a detection of Na and strong optical absorption in HAT-P-1b". Monthly Notices of the Royal Astronomical Society.
9. {{Cite constellation. ADS 16402
10. "ADS16402".
11. "BD+37 4734A".
12. "BD+37 4734B".
13. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal.
14. (2016). "Ground-based near-UV observations of 15 transiting exoplanets: constraints on their atmospheres and no evidence for asymmetrical transits". Monthly Notices of the Royal Astronomical Society.

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