WISEPA J022623.98-021142.8

WISE 0226−0211

Keck image of WISE 0226−0211AB
Credit: Keck Observatory; Brooks et al.[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Right ascension 02h 26m 24.20s
Declination −02° 11′ 37.66″
Characteristics
Evolutionary stage brown dwarf
Spectral type T8+Y0[2]
Astrometry
Proper motion (μ) RA: -294.4 ±1.4 mas/yr[3]
Dec.: -432.3 ±1.2 mas/yr[3]
Parallax (π)56.3 ± 2.5 mas[3]
Distance58 ± 3 ly
(17.8 ± 0.8 pc)
Details[3]
WISE 0226−0211A
Temperature686 ± 79 K
WISE 0226−0211B
Temperature511 ± 79 K
Position (relative to WISE 0226−0211A)[2]
ComponentWISE 0226−0211B
Angular distance2.1″
Other designations
CNS5 617, WISEA J022623.99-021142.7, WISEP J022623.98-021142.8, WISE J022623.98-021142.8, EQ J0226-0211
Database references
SIMBADdata

WISE 0226−0211 (also known as WISEPA J022623.98−021142.8) is a brown dwarf binary with a combined spectral type of T7.[4] Its individual components have a spectral type that is as of now somewhat uncertain at T8-T8.5 for the primary and T9.5-Y0 for the secondary.[2]

The object was first discovered in 2011 with the Wide-field Infrared Survey Explorer and follow-up observations with Keck revealed a spectral type of T7.[4] In 2019 the same team showed that the object is a common proper motion binary with a separation of 2.1 arcseconds from Spitzer images and one H-band Keck image (acquired by David Ciardi). The H-ch2 colors suggest a spectral type of about T8-T8.5 for the primary and about Y0 for the secondary. The absolute magnitudes on the other hand suggest spectral types of about T8-T8.5 for the primary and about T9.5-Y0 for the secondary. It is suspected that the combined spectral type of T7 is in error.[2]

  1. ^ Cite error: The named reference Brooks2023 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Kirkpatrick2019 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Kirkpatrick2021 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Kirkpatrick2011 was invoked but never defined (see the help page).