Gliese 393
Gliese 393 is a red dwarf star in the constellation Sextans. At apparent magnitude 9.65, it is much too faint to be seen with the unaided eye. A small star, it has around 41% the mass and radius of the Sun, but only 2.35% its luminosity.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sextans |
| Right ascension | 10h 28m 55.55087s |
| Declination | +00° 50′ 27.6218″ |
| Apparent magnitude (V) | 9.65 |
| Characteristics | |
| Spectral type | M2.5V |
| Astrometry | |
| Radial velocity (Rv) | -8.34 ± 0.1 km/s |
| Proper motion (μ) | RA: 603.75 ± 1.90 mas/yr Dec.: -728.94 ± 2.04 mas/yr |
| Parallax (π) | 141.50 ± 2.22 mas |
| Distance | 23.0 ± 0.4 ly (7.1 ± 0.1 pc) |
| Details | |
| Mass | 0.41[1] M☉ |
| Radius | 0.41[1] R☉ |
| Luminosity | 0.0235[1] L☉ |
| Temperature | 3544 ± 68[1] K |
| Metallicity | -0.11 ± 0.04[1] |
| Other designations | |
HIP 51317, LTT 12805 | |
| Database references | |
| SIMBAD | data |
Planetary System
In 2019 one candidate planet been detected by the radial velocity method.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.9+1.1 −1.0 M⊕ |
0.055+0.005 −0.006 |
7.0269+0.0034 −0.0041 |
0.03+0.21 −0.03 |
— | — |
gollark: <@337621533369303042> Was it you who wanted this?
gollark: Takes ages to load words, I'm afraid.
gollark: ```pythonimport thesaurusimport randomimport concurrent.futures as futureswords_to_synonyms = {}synonyms_to_words = {}def add_to_key(d, k, v): d[k] = d.get(k, set()).union(set(v))def add_synonyms(syns, word): for syn in syns: add_to_key(synonyms_to_words, syn, [word]) add_to_key(words_to_synonyms, word, syns)def concat(list_of_lists): return sum(list_of_lists, [])def fetch_word(word): results = concat(thesaurus.Word(word).synonyms("all")) return resultsdef add_words(words): with futures.ThreadPoolExecutor(max_workers=50) as executor: word_futures = {executor.submit(fetch_word, word): word for word in words} for future in futures.as_completed(word_futures): word = word_futures[future] try: data = future.result() except Exception as exc: print(f"Error fetching {word}: {exc}") else: add_synonyms(data, word)def getattr_hook(obj, key): results = list(synonyms_to_words.get(key, set()).union(words_to_synonyms.get(key, set()))) if len(results) > 0: return obj.__getattribute__(random.choice(results)) else: raise AttributeError(f"Attribute {key} not found.")def wrap(obj): add_words(dir(obj)) obj.__getattr__ = lambda key: getattr_hook(obj, key)wrap(__builtins__)__builtins__.engrave("Hi!")```
gollark: Ah yes. Global Interpreter Lock. Right. This may be hard.
gollark: On the plus side, you should be able to use `zilch` in place of `None` now.
References
- Maldonado, J.; Affer, L.; Micela, G.; Scandariato, G.; Damasso, M.; Stelzer, B.; Barbieri, M.; Bedin, L. R.; Biazzo, K.; Bignamini, A.; Borsa, F.; Claudi, R. U.; Covino, E.; Desidera, S.; Esposito, M.; Gratton, R.; González Hernández, J. I.; Lanza, A. F.; Maggio, A.; Molinari, E.; Pagano, I.; Perger, M.; Pillitteri, I.; Piotto, G.; Poretti, E.; Prisinzano, L.; Rebolo, R.; Ribas, I.; Shkolnik, E.; Southworth, J.; Sozzetti, A.; Suárez Mascareño, A. (2015). "Stellar parameters of early-M dwarfs from ratios of spectral features at optical wavelengths". Astronomy & Astrophysics. 577: 13. arXiv:1503.03010. Bibcode:2015A&A...577A.132M. doi:10.1051/0004-6361/201525797. A132.
- Barnes, J. R.; et al. (2019-06-11). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644.
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