Apparent magnitude (J (2MASS filter system) >18.52 Apparent magnitude (KS (2MASS filter system) >16.64 | Apparent magnitude (H (2MASS filter system) >17.50 Constellation Coma Berenices | |
Apparent magnitude (Y (MKO filter system) 7001183800000000000♠18.38±0.04 Apparent magnitude (J (MKO filter system) 7001178299999999999♠17.83±0.02 Apparent magnitude (H (MKO filter system) 7001181800000000000♠18.18±0.05 People also search for 31 Comae Berenices, WISE 0734−7157 | ||
WISEPC J121756.91+162640.2 (designation abbreviated to WISE 1217+1626, or WISE J1217+1626) is a binary brown dwarf system of spectral classes T9 + Y0, located in constellation Coma Berenices at approximately 33 light-years from Earth.
Contents
Discovery
WISE 1217+1626 A was discovered in 2011 by J. Davy Kirkpatrick et al. from data, collected by Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite — NASA infrared-wavelength 40 cm (16 in) space telescope, which mission lasted from December 2009 to February 2011. In 2011 Kirkpatrick et al. published a paper in The Astrophysical Journal Supplement, where they presented discovery of 98 new found by WISE brown dwarf systems with components of spectral types M, L, T and Y, among which also was WISE 1217+1626.
Initial estimate of spectral type
Initial estimate of WISE 1217+1626' spectral type (before discovery of its binarity) was T9 (the same as the component's A type estimate made after this discovery).
Discovery of component B
WISE 1217+1626 B was discovered in 2012 by Liu et al. with laser guide star (LGS) adaptive optics (AO) system of the 10-m Keck II Telescope on Mauna Kea, Hawaii, using infra-red camera NIRC2 (the observations were made on 2012 January 29 (UT)). On 2012 April 1 (UT) Liu et al. observed WISE J1217+1626AB using the near-IR camera NIRI on the Gemini-North 8.1-m telescope on Mauna Kea, Hawaii and the binary was marginally resolved. On 12 April 2012 (UT) they obtained resolved spectroscopy of WISE J1217+1626AB with the near-IR spectrograph NIRSPEC again on the Keck II Telescope. In 2012 Liu et al. published a paper in The Astrophysical Journal where they presented results of observations with Keck II LGS-AO of three brown dwarf binary systems, binarity of one of which was known before, and binarity of the other two, including WISE 1217+1626, was first presented in this paper.
Distance
Currently the most accurate distance estimate of WISE 1217+1626 is a trigonometric parallax, measured using Spitzer Space Telescope and published in 2013 by Trent Dupuy and Adam Kraus: 0.099 ± 0.016 arcsec, corresponding to a distance 10.1+1.9
−1.4 pc, or 32.9+6.4
−4.6 ly. In the estimates made before discovery of the component's B by Liu et al. in 2012 the binarity is not taken into account.
WISE 1217+1626 distance estimates
Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.
Space motion
WISE 1217+1626 has proper motion of about 1455 milliarcseconds per year.
WISE 1217+1626 proper motion estimates
The most accurate estimates are marked in bold.
Physical properties
Using three models, Liu et al. calculated physical properties of WISE 1217+1626 components.
From Burrows et al. (2003) models and M(J):
From Lyon/COND models and M(J):
From Lyon/COND models and Lbol: