WISE 0458+6434
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WISEPC J045853.90+643451.9 (designation is abbreviated to WISE 0458+6434) is a binary system of two (A and B) ultracool brown dwarfs of spectral classes T8.5 and T9.5, respectively,[4][5] located in constellation Camelopardalis at approximately 47 ly from Earth.[6]
Quick Facts Constellation, Right ascension ...
Observation data Epoch MJD 55453.42[1] Equinox J2000[1] | |
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Constellation | Camelopardalis |
Right ascension | 04h 58m 53.93s[1] |
Declination | +64° 34′ 52.72″[1] |
Characteristics | |
Whole system | |
Apparent magnitude (Y (FanCam)) | 18.34 ± 0.07[2] |
Apparent magnitude (J (2MASS filter system)) | 17.47 ± 0.05[1] |
Apparent magnitude (H (2MASS filter system)) | 17.41 ± 0.06[1] |
Component A | |
Spectral type | T8.5[3][4][5] |
Apparent magnitude (J (MKO filter system)) | 17.50 ± 0.07[4] |
Apparent magnitude (H (MKO filter system)) | 17.77 ± 0.11[4] |
Component B | |
Spectral type | T9.5[4][5] |
Apparent magnitude (J (MKO filter system)) | 18.48 ± 0.07[4] |
Apparent magnitude (H (MKO filter system)) | 18.79 ± 0.11[4] |
Astrometry | |
Proper motion (μ) | RA: 136 ± 45[6] mas/yr Dec.: 317 ± 22[6] mas/yr |
Parallax (π) | 108.3 ± 1.7 mas[7] |
Distance | 30.1 ± 0.5 ly (9.2 ± 0.1 pc) |
Orbit[7] | |
Primary | A |
Companion | B |
Period (P) | 43+7 −12 yr |
Semi-major axis (a) | 5+0.3 −0.6 au |
Eccentricity (e) | 0.18+0.09 −0.18 |
Inclination (i) | 76.5+1.5 −2.3° |
Details | |
Component A | |
Mass | 15[3][~ 1] MJup |
Surface gravity (log g) | 5.0–5.5[2][~ 2] cgs |
Temperature | 600[3][~ 1] K |
Metallicity | 0 ([Fe/H])[2][~ 2] |
Component B | |
Mass | 10[3][~ 1] MJup |
Temperature | 500[3] [~ 1] K |
Position (relative to A) | |
Component | B |
Epoch of observation | UT 2011 August 29 |
Angular distance | 455.1 ± 4.2 mas [4] |
Position angle | 322.9 ± 0.4° [4] |
Projected separation | 5 ± 0.4 AU [3] |
Other designations | |
Database references | |
SIMBAD | data |
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