PH2

This article is about the star, Planet Hunters 2. For other uses, see Ph2.
PH2 / Kepler-86[1]

Artist's conception of PH2 and its planet, PH2b, viewed from a hypothetical moon of the planet.
Credit: Haven Giguere, Matthew Giguere/Yale
Observation data
Epoch J2000[2]      Equinox J2000[2]
Constellation Cygnus[3]
Right ascension 19h 19m 03.26334s[4]
Declination +51° 57′ 45.4099″[4]
Apparent magnitude (V) 12.699±0.010[5]
Characteristics
Evolutionary stage Main sequence
Spectral type G5V[6][note 1]
Apparent magnitude (J) 11.501±0.023[2]
Apparent magnitude (H) 11.182±0.03[2]
Apparent magnitude (K) 11.116±0.022[2]
Apparent magnitude (B1) 12.34[2]
Apparent magnitude (R1) 12.62[2]
B−V color index 0.072[6]
Astrometry
Radial velocity (Rv)−17.79±1.88[4] km/s
Proper motion (μ) RA: 3.427 mas/yr[4]
Dec.: 16.047 mas/yr[4]
Parallax (π)2.9134 ± 0.0105 mas[4]
Distance1,120 ± 4 ly
(343 ± 1 pc)
Absolute bolometric
magnitude (Mbol)		5.01+0.12
−0.12[7][note 2]
Details[5]
Mass0.958±0.034 M☉
Radius0.961+0.016
−0.015 R☉
Luminosity (bolometric)0.79+0.09
−0.08[8] L☉
Surface gravity (log g)4.45±0.02 cgs
Temperature5711+60
−59 K
Metallicity [Fe/H]−0.03±0.04 dex
Rotation22.6 days
Rotational velocity (v sin i)1.43±0.78[8] km/s
Other designations
PH2, Kepler-86, KOI-3663, KIC 12735740, TIC 416279912, 2MASS J19190326+5157453[9]
Database references
SIMBADdata
KICdata

PH2, also known as Kepler-86,[1] or KIC 12735740 (2MASS J19190326+5157453), is a G-type star[8][note 1] 1,120 light-years (340 parsecs) distant[4] within the constellation Cygnus.[3] Roughly the size and temperature[6] of the Sun,[10] PH2 gained prominence when it was known to be the host of one of 42 planet candidates detected by the Planet Hunters citizen science project in its second data release.[11] The candidate orbiting around PH2, known as PH2b, had been determined to have a spurious detection probability of only 0.08%, thus effectively confirming its existence as a planet.[8]

Located in its parent star's habitable zone, PH2b (or Kepler-86b[1]) is a Jupiter-size gas giant which could in theory host a natural satellite suitable for hosting life.[11] The report of the confirmed detection of PH2b was submitted on January 3, 2013.[8] It was discovered by amateur Pole Rafał Herszkowicz using his laptop and access to the Internet project with data from the Kepler space observatory.[12]

  1. ^ a b c Cite error: The named reference NASA-20130925 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference 2MASS was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference vizier was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Dubber2019 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference KIC was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference mamajek-2012 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference wang-2013 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference sunfactsheet was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference howell-2013 was invoked but never defined (see the help page).
  12. ^ "Polski informatyk Rafał Herszkowicz odkrył nową planete PH2b | Forsal.pl - Giełda, Waluty, Finanse" (in Polish). Forsal. 2013-03-27. Retrieved 2013-07-12.


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