TEPCat: K2-2


 

This page summarises the information held within TEPCat for the transiting planetary system K2-2. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2015ApJ...800...59V  
Date of discovery paper 2014 / 12 / 19 y / m / d
Right ascension 23 35 49.28 h m s
Declination +00 26 43.9 d m s
V-band apparent magnitude 10.19 mag
K-band apparent magnitude 8.03 mag
Transit duration 0.094
( 2.26 )
day
hour
Transit depth 0.1 %
Time of mid-transit   2456907.89 ± 0.03     HJD or BJD
Orbital period 9.1205 ± 0.0005 days
Reference for orbital ephemeris   2015ApJ...800...59V  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 5089 ± 50 K
Stellar metal abundance ([Fe/H] or [M/H])   −0.16 ± 0.08 dex
Stellar mass 0.775 ± 0.027   Msun
Stellar radius 0.716 ± 0.024 Rsun
Stellar logarithmic surface gravity 4.590 ± 0.026 c.g.s.
Stellar mean density 2.11 ± 0.23
( 2.98 ± 0.32 )
ρsun
g cm-3
Orbital eccentricity 0.205 ± 0.072  
Orbital semimajor axis     AU
Planetary mass 0.037 ± 0.004
( 11.8 ± 1.3 )
Mjup
Mearth
Planetary radius 0.226 ± 0.016
( 2.53 ± 0.18 )
Rjup
Rearth
Planetary surface gravity 18.2 +3.7 −3.1
3.26 +0.08 −0.08
m/s2
log(cgs)
Planetary mean density 3.14 ± 0.81
( 4.2 ± 1.1 )
ρjup
g cm-3
Planetary equilibrium temperature 690 ± 14 K
Reference of detailed study 2015ApJ...800...59V  

 

K2-2 does not have an entry in the catalogue of Rossiter-McLaughlin measurements.

 

K2-2 has not been analysed as part of the Homogeneous Studies of Transiting Extrasolar Planets project.

 


Page generated on 2017/12/12           John Southworth   (Keele University, UK)