WISE 1217+1626B

Discovery Data

• Name: WISEPC J121756.91+162640.2B
• Paper: Liu et al. (2012)
• Spectral type: Y0

Spectral Type History

• Liu et al. (2012): Y0
• Leggett et al. (2014): Y0-Y0.5

Photometry

Ground

• Liu et al. (2012): Y(NIRC2/Keck-MKO)=20.26 (0.04), J(NIRC2/Keck-MKO)=20.08 (0.03), H(NIRC2/Keck-MKO)=20.51 (0.06), K(NIRC2/Keck-MKO)=21.10 (0.12)

Spectroscopy

• Liu et al. (2012): NIRSPEC/Keck, H, R=2000
• Leggett et al. (2014): GNIRS/Gemini, 0.9-2.5 μm, R=1700 - Y0-Y0.5

Parallax & Proper Motion

• Lodieu, Béjar, Rebolo (2013): combined light - μ_αcos(δ)=+1410 (100) mas yr−1, μ_δ=−1960 (100) mas yr−1
• Dupuy & Kraus (2013): combined light - pi=99 (16) mas, d=10.1 (+1.9−1.4), μ_αcos(δ)=+786 (42) mas yr−1, μ_δ=−1224 (27) mas yr−1
• Leggett et al. (2017): combined light - π=113 (12) mas, d=8.8 (0.9) pc, μ_αcos(δ)=+760 (11) mas yr−1, μ_δ=−1278 (10) mas yr−1
• Kirkpatrick et al. (2019): combined light - π=104.4 (4.7) mas, d= 9.58 (0.43) pc, μ_αcos(δ)=758.1 (1.7) mas yr−1, μ_δ=−1252.2 (1.5) mas yr−1

Binarity

• Liu et al. (2012): Member of a binary system.

Notes

• Kirkpatrick et al. (2011): Originally identified WISEPC J121756.91+162640.2 as a T9 dwarf. Its AllWISE designation is WISEA J121756.92+162640.3 with W1=16.549 (0.082), W2=13.128 (0.030), W3=12.023 (0.312), W4>8.811.
• Lodieu, Béjar, Rebolo (2013): Combined light, z(OSIRIS/GTO)=21.60 (0.03).