EBLM J0555-57

Coordinates: Sky map 5h 55m 32.6868s, −57° 17′ 26.064″
Source: Wikipedia, the free encyclopedia.
EBLM J0555-57AB
Leonhard Euler Telescope at the ESO's La Silla Observatory[1]

Credit: ESO
Observation data
Epoch J2000      Equinox J2000
Constellation Pictor
EBLM J0555-57A
Right ascension 05h 55m 32.6885s[2]
Declination −57° 17′ 26.067″[2]
Apparent magnitude (V) 9.98[1]
EBLM J0555-57B
Right ascension 05h 55m 32.3944s[3]
Declination −57° 17′ 26.748″[3]
Apparent magnitude (V) 10.76[1]
Characteristics
EBLM J0555-57A
Spectral type F8[4]
Variable type
Eclipsing[1]
EBLM J0555-57B
Spectral type G0V[citation needed]
Distance
669 ± 2 ly
(205.1 ± 0.7 pc)
Position (relative to A)
ComponentB
Projected separation
479 AU [1]
Argument of periastron
(ω)
(secondary)		−53.7+1.5
−1.8°
Details
Gyr
EBLM J0555-57Ab
Mass85.2+4.0
−3.9[1] MJup
Radius0.84+0.14
−0.04[1] RJup
Surface gravity (log g)5.50+0.03
−0.13[1] cgs
EBLM J0555-57B
dex
TYC 8528-926, 2MASS
J05553262-5717261
Database references
SIMBADdata

EBLM J0555-57 is a

fusion of hydrogen
in its core.

System

A z' band light curve for EBLM J0555-57, adapted from von Boetticher et al. (2017)[1]

EBLM J0555-57, also known as CD−57 1311, is a triple star system[1][10] in the constellation Pictor, which contains a visual binary system consisting of two sun-like stars separated by 2.5": EBLM J0555-57Aa, a magnitude 9.98 spectral type F8 star, and EBLM J0555-57B, a magnitude 10.76 star. No orbital motion has been detected but they have almost identical radial velocities and are assumed to be gravitationally bound.[1]

Component A of the system is itself an

semi-major axis of 0.08 AU.[1]

EBLM J0555-57Ab

EBLM J0555-57Ab has a mass of about 85.2±4

transit method.[11] Additional properties of the star were determined using Doppler spectroscopy, to measure the periodic radial velocity variation of the primary star due to the gravitational influence of its companion.[1]

Wikinews has related news:

EBLM J0555-57Ab is the

smallest hydrogen burning star
currently known.

See also

References

  1. ^
    S2CID 54610182
    .
  2. ^
    doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  3. ^
    doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  4. ^
    doi:10.1086/323920
    .
  5. S2CID 118835808
    .
  6. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  7. S2CID 85517239
    .
  8. ^
    Bibcode:2022yCat.1354....0A
    .
  9. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  10. ^ Wenz, John (11 July 2017). "This Is the Smallest Star Ever Discovered". Popular Mechanics. Retrieved 17 July 2017.
  11. ^ "Smallest-ever star discovered by astronomers". Phys.org. 12 July 2017. Retrieved 12 July 2017.

External links

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