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Gliese 65

Gliese 65 A/B

Gliese 65, as seen during the Digitized Sky Survey
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Gliese 65 A (BL Ceti)
Right ascension 01h 39m 01.3773s[1]
Declination –17° 57′ 02.587″[1]
Apparent magnitude (V) 12.8[2]
Gliese 65 B (UV Ceti)
Right ascension 01h 39m 01.6377s[3]
Declination –17° 57′ 01.001″[3]
Apparent magnitude (V) 12.8[2]
Characteristics
Gliese 65 A (BL Ceti)
Spectral type M5.5V[4]
U−B color index 1.10
B−V color index 1.87
Variable type UV Cet[5]
Gliese 65 B (UV Ceti)
Spectral type M6 V[4]
Variable type UV Cet[6]
Astrometry
Parallax (π)371.92 ± 0.42 mas[7]
Distance8.770 ± 0.010 ly
(2.689 ± 0.003 pc)
Gliese 65 A (BL Ceti)
Proper motion (μ) RA: 3385.316[1] mas/yr
Dec.: 544.386[1] mas/yr
Absolute magnitude (MV)15.7[2]
Gliese 65 B (UV Ceti)
Proper motion (μ) RA: 3178.694[3] mas/yr
Dec.: 584.061[3] mas/yr
Absolute magnitude (MV)15.7[2]
Orbit[7]
Period (P)26.38±0.002 yr
Semi-major axis (a)2.0584±0.0097[8]"
(5.459±0.002 AU)
Eccentricity (e)0.6172±0.0001
Inclination (i)128.0±0.1°
Longitude of the node (Ω)325.9±0.1°
Periastron epoch (T)41333±8 MJD
(17 January 1972)
Argument of periastron (ω)
(secondary)		103.2±0.1°
Details
Gliese 65 A
Mass0.122±0.002[7] M☉
Radius0.165±0.006[8] R☉
Luminosity0.00147±0.00005[9] L☉
Surface gravity (log g)5.092±0.015[8] cgs
Temperature2784±58[9] K
Metallicity [Fe/H]−0.03±0.20[8] dex
Rotation0.2430±0.0005[10] days
Rotational velocity (v sin i)28.2±2[8] km/s
Gliese 65 B
Mass0.116±0.002[7] M☉
Radius0.159±0.006[8] R☉
Luminosity0.00125±0.00005[9] L☉
Surface gravity (log g)5.113±0.015[8] cgs
Temperature2728±60[9] K
Metallicity [Fe/H]−0.12±0.20[8] dex
Rotation0.2268±0.0003[10] days
Rotational velocity (v sin i)30.6±2[8] km/s
Other designations
GJ 65, G 272-61, L 726-8, PLX 343.1
Gliese 65 A: BL Ceti, LHS 9, LP 768-27
Gliese 65 B: UV Ceti, LHS 10, LP 768-26
Database references
SIMBADThe system
A (BL Cet)
B (UV Cet)

Gliese 65, also known as Luyten 726-8, is a binary star system that is one of Earth's nearest neighbors, at 8.8 light-years (2.7 parsecs) from Earth in the constellation Cetus. The two component stars are both flare stars with the variable star designations BL Ceti and UV Ceti.

  1. ^ a b c d Cite error: The named reference Gaia3a was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference houdebine2019 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Gaia3b was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference kirkpatrick1991 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference BL was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference UV was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference GRAVITY2024 was invoked but never defined (see the help page).
  8. ^ a b c d e f g h i Cite error: The named reference aaa593_A127 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference apj860_A15 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference mnras471_811 was invoked but never defined (see the help page).
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