ExoAtmospheres
IAC community database for exoplanet atmospheric observations
HR 8799 b
| Planet status | Confirmed |
|---|---|
| Planet type | Jupiter |
| Period | 164250 d |
| Mass | 7 MJ 2224.6 M⊕ |
| Radius | 1.2 RJ 13.44 R⊕ |
| Semi major axis | 68 AU |
| Star name | HR 8799 |
| Star distance | 39.4 pc |
| Star teff | N/A |
| Star radius | 1.5 R☉ |
| Temperature (calculated) | N/A |
| V | 5.96 mag |
| J | 5.383 mag |
| K | 5.24 mag |
| Alternate names | |
| Exoplanet Encyclopaedia |  |
Molecules
CH4: Detection CO: Detection H2O: Detection NH3: Detection H2S: Detection CO2: Detection Molecular ratios: C/O, etc...: Detection
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JWST-NIRSpec | The compositions of the HR 8799 planets reflect accretion of both solids and metal-enriched gas2026, Jerry W. Xuan, Jean-Baptiste Ruffio et al. |
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CO2: Detection
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JWST-NIRCam | JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO$_2$ in the HR 8799 and 51 Eri Exoplanets' Atmospheres2025, William O. Balmer, Jens Kammerer et al. |
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Cloudy: Detection Molecular ratios: C/O, etc...: Detection
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G-B:Low resolution IR | Four-of-a-kind? Comprehensive atmospheric characterisation of the HR 8799 planets with VLTI/GRAVITY2024, E. Nasedkin, P. Mollière et al. |
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H2O: Detection CO: Detection CH4: Upper limit
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G-B:Low resolution IR | Deep exploration of the planets HR 8799 b, c, and d with moderate resolution spectroscopy2021, Jean-Baptiste Ruffio, Quinn M. Konopacky et al. |
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H2O: Detection CO: Detection
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Direct Detection | Detection and Bulk Properties of the HR 8799 Planets with High Resolution Spectroscopy2021, Jason J. Wang, Jean-Baptiste Ruffio et al. |
KPIC instrument, high-resolution spectroscopy |
NH3: Detection H2C2: Detection CO2: Detection
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G-B: High resolution IR | Reconnaissance of the HR 8799 Exosolar System I: Near IR Spectroscopy2013, B. R. Oppenheimer, C. Baranec et al. |