WISE 0647−6232

Coordinates: Sky map 06h 47m 23.2270s, −62° 32′ 39.744″
Source: Wikipedia, the free encyclopedia.
WISE J064723.23−623235.5

WISE 0647-6232
Credit: unWISE
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Pictor
Right ascension 06h 47m 23.2270s[1]
Declination −62° 32′ 39.744″[1]
Characteristics
Spectral type Y1 ± 0.5[1]
Apparent magnitude (J (LCO filter system)) >23.0 ± 0.1[1]
MKO
filter system)) 		22.65 ± 0.27[1]
Apparent magnitude (H (LCO filter system)) >21.7 ± 0.3[1]
MKO
filter system)) 		23.40 ± 0.29[1]
Apparent magnitude (W1) >19.09[1]
Apparent magnitude (W2) 15.32 ± 0.08[1]
Apparent magnitude (W3) >13.49[1]
Apparent magnitude (W4) >9.66[1]
Distance
32.5 ± 0.8 ly
(10.0 ± 0.2 pc)
Details
Mass5–30[1] MJup
Surface gravity (log g)3.0–5.0[1] cgs
Temperature350–400[1] K
Other designations
WISE J064723.23-623235.5[1]
WISE 0647-6232[1]
Database references
SIMBADdata

WISE J064723.23−623235.5 (abbreviated WISE 0647−6232) is a nearby

spectral type Y1 ± 0.5, located in constellation Pictor at approximately 32.5 light-years from Earth.[2] It is one of the two or three reddest and one of the four latest-type brown dwarfs known.[1]

History of observations

Discovery

WISE 0647−6232 was discovered by 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. The discovery was announced in 2013.

WISE 0647−6232 was first imaged by WISE on 9 May 2010. On 17 June 2010 after preliminary data processing it was uncovered as a very cold brown dwarf candidate.

Then were carried out follow-up observations:

  • using the Infrared Array Camera (IRAC) on
    MJD
    55458.43 (possibly 16 September 2010);
  • J- and H-band images using Persson's Auxiliary Nasmyth Infrared Camera (PANIC) at the 6.5-meter Magellan Baade telescope at the Las Campanas Observatory, Chile, on 25 November 2010;
  • with the FourStar infrared camera also at Magellan Baade telescope on 15 January 2013 and 23 March 2013;
  • with the Folded-port InfraRed Echellette (FIRE) spectrograph also at Magellan Baade telescope on 24 March 2013;
  • using the Wide Field Camera 3 (WFC3) on Hubble Space Telescope on 13–14 May 2013, and pre-image was obtained on 11 February 2013.

On 25 August 2013 Kirkpatrick et al. submitted the discovery paper to The Astrophysical Journal.

WISE 0647−6232 became the 17th Y-type dwarf discovered and confirmed spectroscopically (in addition,

WD 0806-661B is also almost certainly a Y-type dwarf, which was found before discovery of WISE 0647−6232, but it still lacks a spectroscopical confirmation).[1]

Distance

Currently the most accurate distance estimate of WISE 0647−6232 is a

trigonometric parallax, published in 2019 by Kirkpatrick et al.: 10.0+0.2
−0.2 pc, or 32.5+0.8
−0.8 ly.[2]

WISE 0647-6232 distance estimates
Source Parallax,
mas
 Distance, pc Distance, ly Ref.
Kirkpatrick et al. (2013) 115 ± 12 8.7+1.0
−0.8		 28.4+3.3
−2.7		 [1]
Kirkpatrick et al. (2019) 100.3 ± 2.4 10.0+0.2
−0.2		 32.5+0.8
−0.8 		[2]

The best estimate is marked in bold.

Properties

WISE 0647−6232 has

Gyr log(g)=4.0–5.0.[1]

The only redder than WISE 0647−6232 confirmed Y dwarf is

WD 0806-661B
may also be redder than WISE 0647−6232.

The other three latest-type Y dwarfs are: WISE 0350−5658 (Y1), WISE 0535−7500 (≥Y1)[3] and WISE 1828+2650 (≥Y2).[1]

See also

References

  1. ^
    S2CID 6230841
    .
  2. ^
    doi:10.3847/1538-4365/aaf6af
    . 19.
  3. S2CID 42923100
    .
Retrieved from "https://en.wikipedia.org/w/index.php?title=WISE_0647−6232&oldid=1210619311"