This page summarises the information held within TEPCat for the transiting planetary system GJ 9827d. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2017AJ....154..266N | |
| Date of discovery paper | 2017 / 9 / 6 | y / m / d |
| Data/telescope used for discovery | K2 | |
| Right ascension | 23 27 04.84 | h m s |
| Declination | −01 17 10.6 | d m s |
| Right ascension (decimal) | 351.77017 | degrees |
| Declination (decimal) | -1.28628 | degrees |
| V-band apparent magnitude | 10.51 | mag |
| K-band apparent magnitude | 7.19 | mag |
| Transit duration | 0.06667 ( 1.6001 ) | day hour |
| Transit depth | 0.08 | % |
| Time of mid-transit | 2460265.10196 ± 0.00006 | HJD or BJD |
| Orbital period | 6.201830 ± 0.000003 | days |
| Reference for orbital ephemeris | arXiv:2410.03527 |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 4236 ± 12 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | −0.29 ± 0.03 | dex |
| Stellar mass | 0.62 ± 0.04 | Msun |
| Stellar radius | 0.58 ± 0.03 | Rsun |
| Stellar logarithmic surface gravity | 4.70 ± 0.05 | c.g.s. |
| Stellar mean density | 3.47 +0.27 −0.73 ( 4.90 +0.38 −1.03 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0 | |
| Orbital semimajor axis | 0.0563 ± 0.0012 | AU |
| Planetary mass | 0.0095 ± 0.0018 ( 3.02 ± 0.57 ) | Mjup Mearth |
| Planetary radius | 0.177 +0.010 −0.011 ( 1.98 +0.11 −0.12 ) | Rjup Rearth |
| Planetary surface gravity | m/s2 log(cgs) | |
| Planetary mean density | 1.9 ± 0.5 ( 2.52 ± 0.66 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 675 +14 −12 | K |
| Reference of detailed study | arXiv:2410.03527 |
GJ 9827d does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2025/03/24 John Southworth (Keele University, UK)