 Resolved image of EBLM J0555-57A (left) and EBLM J0555-57B (right) taken with the 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] |
| Astrometry | |
| EBLM J0555-57A | |
| Radial velocity (Rv) | 18.66±0.74[5] km/s |
| Proper motion (μ) | RA: 2.972[2] mas/yr Dec.: −39.532[2] mas/yr |
| Parallax (π) | 4.8611 ± 0.0137 mas[2] |
| Distance | 671 ± 2 ly (205.7 ± 0.6 pc) |
| EBLM J0555-57B | |
| Proper motion (μ) | RA: 2.838[3] mas/yr Dec.: −38.344[3] mas/yr |
| Parallax (π) | 4.8747 ± 0.0175 mas[3] |
| Distance | 669 ± 2 ly (205.1 ± 0.7 pc) |
| Position (relative to A) | |
| Component | B |
| Epoch of observation | 1998 |
| Angular distance | 2.50″ [4] |
| Position angle | 254° [4] |
| Projected separation | 479 AU [1] |
| Orbit[1] | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 7.757676+0.000029 −0.000025 d |
| Semi-major axis (a) | 0.0817±0.0019 au |
| Eccentricity (e) | 0.0894+0.0035 −0.0036 |
| Inclination (i) | 89.84+0.2 −1.8° |
| Argument of periastron (ω) (secondary) | −53.7+1.5 −1.8° |
| Details[1] | |
| EBLM J0555-57Aa | |
| Mass | 1.13±0.08[1] M☉ |
| Radius | 0.99+0.15 −0.03[1] R☉ |
| Luminosity | 3.245[6] L☉ |
| Surface gravity (log g) | 4.18±0.21[1] cgs |
| Temperature | 6,461±124[1] K |
| Metallicity [Fe/H] | −0.24±0.16[1] dex |
| Rotational velocity (v sin i) | 7.60±0.28[1] km/s |
| Age | 1.9±1.2[7] Gyr |
| EBLM J0555-57Ab | |
| Mass | 85.2+4.0 −3.9[1] MJup |
| Radius | 0.84+0.14 −0.04[1] RJup |
| Surface gravity (log g) | 5.50+0.03 −0.13[1] cgs |
| EBLM J0555-57B | |
| Mass | 1.01[8] M☉ |
| Radius | 0.94±0.08[1] R☉ |
| Luminosity | 1.501[9] L☉ |
| Surface gravity (log g) | 4.37[8] cgs |
| Temperature | 5,717±124[1] K |
| Metallicity [Fe/H] | −0.38[8] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
EBLM J0555-57 is a triple star system approximately 670 light-years from Earth. The system's discovery was released on July 12, 2017. EBLM J0555-57Ab, the smallest star in the system, orbits its primary star with a period of 7.8 days, and currently is the smallest known star with a mass sufficient to enable the fusion of hydrogen in its core.
- ^ a b c d e f g h i j k l m n o p q r Cite error: The named reference
eblwas invoked but never defined (see the help page). - ^ a b c d e Cite error: The named reference
edr3awas invoked but never defined (see the help page). - ^ a b c d e Cite error: The named reference
edr3bwas invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
wdswas invoked but never defined (see the help page). - ^ Cite error: The named reference
ravewas invoked but never defined (see the help page). - ^ Cite error: The named reference
dr2awas invoked but never defined (see the help page). - ^ Cite error: The named reference
vb2019was invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
starhorse2was invoked but never defined (see the help page). - ^ Cite error: The named reference
dr2bwas invoked but never defined (see the help page).