WISE J2030+0749

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Coordinates: 20^h 30^m 42.897^s, +07° 49′ 34.44″

WISE J2030+0749
Observation data Epoch 2012.855^{[ 1]} Equinox J2000
Constellation	Delphinus
Right ascension	20^h 30^m 42.897^s^{[ 1]}
Declination	07° 49′ 34.44″^{[ 1]}
Characteristics
Spectral type	T1.5^{[ 1]}^{[ 1]}
Apparent magnitude (i (SDSS))	21.810 ± 0.140^{[ 1]}
Apparent magnitude (z (SDSS))	17.195 ± 0.014^{[ 1]}
Apparent magnitude (J (2MASS))	14.227 ± 0.029^{[ 1]}
Apparent magnitude (H (2MASS))	13.435 ± 0.033^{[ 1]}
Apparent magnitude (K_s (2MASS))	13.319 ± 0.039^{[ 1]}
Apparent magnitude (w1 (WISE))	12.956 ± 0.025^{[ 1]}
Apparent magnitude (w2 (WISE))	12.122 ± 0.025^{[ 1]}
Apparent magnitude (w3 (WISE))	10.964 ± 0.110^{[ 1]}
Astrometry

Proper motion (μ)	RA: 653 ± 6^{[ 1]} mas/yr Dec.: -138 ± 16^{[ 1]} mas/yr
Distance	34.2 ± 8.5^{[ 1]} ly (10.5 ± 2.6^{[ 1]} pc)

Other designations
WISE J203042.79+074934.7^{[ 1]}^{[ 1]} WISE J2030+0749^{[ 1]}^{[ 1]}

WISE J2030+0749 is a nearby brown dwarf of spectral type T1.5,^{[ 1]}^{[ 1]} located in constellation Delphinus at approximately 10.5 pc (34.2 ly) from Earth.^{[ 1]}

History of observations

Discovery of WISE J2030+0749 was announced in 2013 by Mace et al.^{[ 1]} and independently by Bihain et al.^{[ 1]}

Mace et al. selected T-type brown dwarf candidates from WISE All-Sky source catalogue and carried out follow up observations using a variety of telescopes. September 11, 2011 WISE J2030+0749 was observed using SpeX at Infrared Telescope Facility (IRTF). The discovery paper was submitted to The Astrophysical Journal Supplement, accepted for publication on 2013 January 15 and published in March, 2013. The total number of announced in Mace et al. (2013) brown dwarfs is 87, all are of T-type.^{[ 1]}

Bihain et al. selected sources with colours typical for T dwarfs from WISE All-Sky source catalogue and checked them for high proper motion using older surveys: 2MASS, DENIS, SDSS, SSS, DSS and UKIDSS. Three objects among about ten candidates, including WISE J2030+0749, were selected for spectroscopic follow up with Large Binocular Telescope (LBT). November 8, 2012 Bihain et al. carried out follow up observations of WISE J2030+0749 with near-Infrared spectrograph LUCI 1 on LBT. June 25, 2013 Astronomy & Astrophysics received the discovery paper, which was accepted for publication 10 July 2013.^{[ 1]}

Distance

Distance of WISE J2030+0749 was estimated by Bihain et al. using mean absolute magnitudes of single T1/T2 dwarfs, derived by Dupuy & Liu (2012) from trigonometric parallaxes:^{[ 1]} 10.5 ± 2.6 pc (34.2 ± 8.5 ly).^{[ 1]}

WISE J2030+0749 distance estimates

Source	Parallax, mas	Distance, pc	Distance, ly	Ref.
Bihain et al. (2013)		10.5 ± 2.6	34.2 ± 8.5	^{[ 1]}

Non-trigonometric estimates are marked in italic. The best estimate is marked in bold.

References

↑ Mace, Gregory N.; Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Eisenhardt, Peter R.; McLean, Ian S.; Thompson, Maggie A.; Mix, Katholeen; Bailey, Vanessa; Beichman, Charles A.; Bloom, Joshua S.; Burgasser, Adam J.; Fortney, Jonathan J.; Hinz, Philip M.; Knox, Russell P.; Lowrance, Patrick J.; Marley, Mark S.; Morley, Caroline V.; Rodigas, Timothy J.; Saumon, Didier; Sheppard, Scott S.; Stock, Nathan D. (2013). "A Study of the Diverse T Dwarf Population Revealed by WISE". The Astrophysical Journal Supplement 205 (1): 6. arXiv:1301.3913. Bibcode:2013ApJS..205....6M. doi:10.1088/0067-0049/205/1/6.
↑ Bihain, Gabriel; Ralf-Dieter Scholz, Jesper Storm, Olivier Schnurr (2013). "An overlooked brown dwarf neighbour (T7.5 at d~5pc) of the Sun and two additional T dwarfs at about 10pc". arXiv:1307.2722. Bibcode 2013arXiv1307.2722B.
↑ Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". The Astrophysical Journal Supplement 201 (2): 19. arXiv:1201.2465. Bibcode:2012ApJS..201...19D. doi:10.1088/0067-0049/201/2/19.

← Star systems within 30–35 light-years →

Star systems (including brown dwarf systems) within 30–35 light-years from Earth.

Giant star

K III	Pollux (33.7 ± 0.3 ly; 1 star, 1 planet: b)

F
(Yellow-white)

IV	Zeta Herculis «Rutilicus» (34.8 ± 0.2 ly; 2 stars)

V	Gamma Pavonis (30.1 ± 0.2 ly; 1 star)

G V (Yellow)	HR 4523 (30.1 ± 0.2 ly; 2 stars, 1 planet: b) 61 Ursae Majoris (31.1 ± 0.2 ly; 1 star) Alpha Mensae (33.1 ± 0.2 ly; 1 star) Iota Persei (34.4 ± 0.3 ly; 1 star)

K V (Orange)	HR 4458 (31.1 ± 0.2 ly; 2 stars) Gliese 638 (31.9 ± 0.3 ly; 1 star) 12 Ophiuchi (31.9 ± 0.3 ly; 1 star) HR 511 (32.5 ± 0.2 ly; 1 star) HR 5256 (33.0 ± 0.2 ly; 1 star) Gliese 453 (33.2 ± 0.3 ly; 1 star) HR 857 (33.9 ± 0.3 ly; 1 star) HD 160346 (34.9 ± 0.5 ly; 1 star)

M V
(Red dwarf)

Gliese 176 (30.6 ly; 1 star, 1 planet: b)
LP 655-48 (32.0 ± 3.6 ly; 1 star)
AU/AT Microscopii (32.4 ly; 3 stars: AU Mic
AT Mic A
AT Mic B)
Gliese 22 (33.0 ly; 3 stars, 1 brown dwarf)
Gliese 436 (33.4 ly; 1 star, 1 (3?) planets: c (UCF-1.01)?
b
d (UCF-1.02)?)
Gliese 649 (33.7 ly; 1 star, 1(2?) planets: c?
b)
TVLM513-46546 (34.6 ly; 1 star)
Gliese 617 (34.8 ± 0.4 ly; 2 stars)

White
dwarf

DA	LHS 145 (31.7 ± 0.3 ly; 1 star) LB 3303 (33.4 ± 0.6 ly; 2 stars) WD 0821-669 (34.7 ± 0.4 ly; 1 star)

DC	G 174-14 (33.6 ± 1.3 ly; 1 star) G 195-19 (33.7 ± 0.6 ly; 1 star)

DQ	LHS 194 (31.0 ± 0.8 ly; 1 star)

Brown
dwarf

L	2MASS 1750-00 (30.1 ± 0.7 ly; 1 brown dwarf) 2MASS J11553952-3727350 (31.2 ± 1.5 ly; 1 brown dwarf) WISE J140533.32+835030.5 (31.6* ± 5.5 ly; 1 brown dwarf)* 2MASS J08251968+2115521 (34.8 ± 0.4 ly; 1 brown dwarf)

T	2MASS 0034+0523 (30.9+2.4 −2.1 ly; 1 brown dwarf) CFBD J0059-01 (31.6 ± 0.6 ly; 1 brown dwarf) WISE 0811-8051 (~32.0 ly; 1 brown dwarf) 2MASS J2139+0220 (32.1 ± 0.6 ly; 1 brown dwarf) WISE 1614+1739 (~32.6 ly; 1 brown dwarf) ULAS J1335+11 (32.6 ± 0.5 ly; 1 brown dwarf) WISE 1150+6302 (~32.9 ly; 1 brown dwarf) WISE 1318-1758 (~32.9 ly; 1 brown dwarf) WISE 1217+1626 (32.9+6.4 −4.6 ly; 2 brown dwarfs) 2MASS 0559-1404 (33.76 ± 0.35 ly; 1 brown dwarf) 2MASS 1237+6526 (33.9 ± 1.8 ly; 1 brown dwarf) WISE 1322-2340 (~33.9 ly; 1 brown dwarf) WISE J2030+0749 (34.2* ± 8.5 ly; 1 brown dwarf)* 2MASS 1047+2124 (34.4 ± 1.4 ly; 1 brown dwarf) 2MASS J00501994−3322402 (34.5 ± 0.9 ly; 1 brown dwarf) 2MASS 2228-4310 (34.7+2.8 −2.4 ly; 1 brown dwarf) 2MASS 0243-2453 (34.8 ± 1.4 ly; 1 brown dwarf)

Y	WISE 1738+2732 (32.0+6.9 −4.8 ly; 1 brown dwarf) WISE 0734-7157 (~34.9 ly; 1 brown dwarf)

In left column are stellar classes of primary members of star systems. Bold are systems containing at least one component with absolute magnitude of +8.5 or brighter. Italic are systems without known trigonometric parallax.

v t e Stars of Delphinus

Bayer	α (Sualocin) β (Rotanev) γ δ ε (Deneb Dulfim) ζ η θ ι κ ρ Aql (Tso Ke)

Flamsteed	1 10 13 14 15 16 17 18

Variable	R U V W TX TY BX CM DM DX EU HR LS LT LU MR

HR	7771 7774 7778 7793 7810 7813 7816 7820 7824 7839 7899 7907 7914 7954 7975 8010 8044 8057 8088

HD	194578 194841 195019 195909

Gliese	Gliese 791.2 Gliese 795

Other	HAT-P-23 Nova Delphini 2013 WASP-2 WISE J2030+0749 WISE 2056+1459

List

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WISE J2030+0749

History of observations

Distance

See also

References