TEPCat: NGTS-21


 

This page summarises the information held within TEPCat for the transiting planetary system NGTS-21. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2022MNRAS.517.4447A  
Date of discovery paper 2022 / 10 / 4 y / m / d
Data/telescope used for discovery NGTS  
Right ascension 20 45 01.99 h m s
Declination −35 25 40.2 d m s
Right ascension (decimal) 311.25829 degrees
Declination (decimal) -35.42783 degrees
V-band apparent magnitude 15.62 mag
K-band apparent magnitude 12.95 mag
Transit duration 0.0813
( 1.951 )
day
hour
Transit depth 2.6 %
Time of mid-transit   2458228.77853 ± 0.00067     HJD or BJD
Orbital period 1.5433897 ± 0.0000016 days
Reference for orbital ephemeris   2022MNRAS.517.4447A  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 4660 ± 41 K
Stellar metal abundance ([Fe/H] or [M/H])   −0.26 ± 0.07 dex
Stellar mass 0.72 ± 0.04   Msun
Stellar radius 0.86 ± 0.04 Rsun
Stellar logarithmic surface gravity 4.63 ± 0.34 c.g.s.
Stellar mean density ρsun
g cm-3
Orbital eccentricity 0.0  
Orbital semimajor axis   0.0236 ± 0.0005  AU
Planetary mass 2.36 ± 0.21
( 750 ± 66 )
Mjup
Mearth
Planetary radius 1.33 ± 0.03
( 14.91 ± 0.34 )
Rjup
Rearth
Planetary surface gravity m/s2
log(cgs)
Planetary mean density 0.94 ± 0.13
( 1.25 ± 0.17 )
ρjup
g cm-3
Planetary equilibrium temperature 1357 ± 15 K
Reference of detailed study 2022MNRAS.517.4447A  

 

NGTS-21 does not have an entry in the catalogue of orbital obliquity measurements.

 


Page generated on 2024/04/19           John Southworth   (Keele University, UK)