Gliese 555

Gliese 555 (HN Librae) is a red dwarf star of spectral type M4.0V, located in constellation Libra at 20.2 light-years from Earth.[13]

GJ 555
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Libra
Right ascension  14h 34m 16.81183s[1]
Declination −12° 31′ 10.3965″[1]
Apparent magnitude (V) 11.317
Characteristics
Spectral type M4.0V
Variable type BY Dra type
Astrometry
Radial velocity (Rv)-1.45 ± 0.1 km/s
Parallax (π)161.73 ± 1.47[2] mas
Distance20.2 ± 0.2 ly
(6.18 ± 0.06 pc)
Other designations
HN Lib, BD−11 3759[3], GJ 555[4], HIP 71253[5], Ci 20 870[6], LFT 1120, LHS 2945[7], LPM 532, LTT 5759, NLTT 37751[8], PLX 3296[9], PM 14316-1219, Wolf 1481[10], TYC 5572-804-1[11][12], GSC 05572-00804, 2MASS J14341683-1231106
Database references
SIMBADdata

Planetary system

In 2019 one planet been detected by radial velocity among other 118 planets around M dwarf stars.[14]

The Gliese 555 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 30.1+16.3−14.6 M⊕ 0.727+0.061−0.075 449.6+6.8−5.9 0.04+0.27−0.04 — —
gollark: Yes, thanks TIOpy?
gollark: ```python#!/usr/bin/env python3import subprocess, os, os.path, sys, argparse, datetimetimestamp = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")print(timestamp)parser = argparse.ArgumentParser(description="do backups, probably")parser.add_argument("--encrypt", "-E", help="store backup in encrypted folder (please make sure it's unlocked)", action="store_true")parser.add_argument("--no-incremental", "-n", help="don't do incremental backup", action="store_true")parser.add_argument("--save_as", "-a", help="back up under different name")parser.add_argument("dir", help="directory to backup")args = parser.parse_args()incremental = not args.no_incrementalprint(args)srcdir = os.path.abspath(args.dir)outdir = os.path.join(os.path.dirname(os.path.abspath(sys.argv[0])), "encrypted/backups" if args.encrypt else "backups")safepath = (args.save_as or srcdir).lstrip("/").replace("/", "-").replace("_", "-")outpath = os.path.join(outdir, f"{safepath}_{timestamp}{'_incr' if incremental else ''}.tar.zst")snapshot = os.path.join(outdir, f"{safepath}.snapshot")snapargs = ["-g", snapshot] if incremental else []print(srcdir, outdir, outpath)tarproc = subprocess.Popen(["tar", "-c", "-v", "-C", os.path.dirname(srcdir), os.path.basename(srcdir)] + snapargs, stdout=subprocess.PIPE)zstproc = subprocess.Popen(["zstd", "-10", "-T0", "-o", outpath], stdin=tarproc.stdout)def assert_proc(x): if x.wait() != 0: print(f"warning: {x.args} failed")assert_proc(tarproc)assert_proc(zstproc)```efficiency™
gollark: Wow, I really love having to use `grep` to find an option in `--help`!
gollark: Yes.
gollark: Anyway², I'll switch over my backup stuff and use the existing incremental tar thing for smallish compressible directories and rsync for large-scale apiary data.

References
  1. van Leeuwen F. (2007). "HIP 71253". Validation of the new Hipparcos reduction.
  2. Davison, Cassy L.; White, Russel J.; Henry, Todd J.; Riedel, Adric R.; Jao, Wei-Chun; Bailey III, John I.; Quinn, Samuel N.; Justin R., Cantrell; John P., Subasavage; Jen G., Winters (2015). "A 3D Search for Companions to 12 Nearby M-Dwarfs". The Astronomical Journal. 149 (3): 106. arXiv:1501.05012. Bibcode:2015AJ....149..106D. doi:10.1088/0004-6256/149/3/106.
  3. Schönfeld, Eduard; et al. (1886). "BD -11 3759". Southern Durchmusterung.
  4. Gliese, W.; Jahreiß, H. (1991). "Gl 555". Preliminary Version of the Third Catalogue of Nearby Stars.
  5. Perryman; et al. (1997). "HIP 71253". The Hipparcos and Tycho Catalogues.
  6. Porter, J. G.; Yowell, E. J.; Smith, E. S. (1930). "A catalogue of 1474 stars with proper motion exceeding four-tenths year". Publications of the Cincinnati Observatory. 20: 1–32. Bibcode:1930PCinO..20....1P. Page 20 (Ci 20 870).
  7. Luyten, Willem Jacob (1979). "LHS 2945". LHS Catalogue, 2nd Edition.
  8. Luyten, Willem Jacob (1979). "NLTT 37751". NLTT Catalogue.
  9. Van Altena W. F.; Lee J. T.; Hoffleit E. D. (1995). "GCTP 3296". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.).
  10. Wolf, M. (1925). "Einige bewegte Sterne in Virgo und Libra". Astronomische Nachrichten. 225 (12): 215–216. Bibcode:1925AN....225R.215W. doi:10.1002/asna.19252251205. Page 215/216 (Wolf 1481)
  11. Perryman; et al. (1997). "HIP 71253". The Hipparcos and Tycho Catalogues.
  12. Hog; et al. (2000). "TYC 5572-804-1". The Tycho-2 Catalogue.
  13. Jao, Wei-Chun; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Ianna, Philip A.; Bartlett, Jennifer L.; Costa, Edgardo; Méndez, René A. (2005). "The Solar Neighborhood. XIII. Parallax Results from the CTIOPI 0.9 Meter Program: Stars with mu >= 1.0" yr-1 (MOTION Sample)". The Astronomical Journal. 129 (4): 1954–1967. arXiv:astro-ph/0502167. Bibcode:2005AJ....129.1954J. doi:10.1086/428489.
  14. Barnes, J. R.; Kiraga, M.; Diaz, M.; Berdiñas, Z.; Jenkins, J. S.; Keiser, S.; Thompson, I.; Crane, J. D.; Shectman, S. A. (2019-06-11). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644v1. Bibcode:2019arXiv190604644T. Cite journal requires |journal= (help)
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