ISOHDFS 27
ISOHDFS 27 taken by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Tucana
Right ascension	22h 32m 47.7s
Declination	−60° 33′ 35.9″
Redshift	0.5807±0.0003
Heliocentric radial velocity	174,090 km/s (108,170 mi/s)
Galactocentric velocity	174,009 km/s (108,124 mi/s)
Distance	6 billion ly (1.8 billion pc) (light travel distance) 7 billion ly (2.1 billion pc) (comoving distance)
Apparent magnitude (V)	20.51
Characteristics
Type	Sab
Mass	1.04×1012 M☉
Size	130 kly (40 kpc)
Apparent size (V)	0.07 × 0.07
Other designations
HDFS J223247.66-603335.9, LFR2003 193, SB-WF 3572-1508, CDD2000 1670, USNOA2 0225-31548819

ISOHDFS 27 is a spiral galaxy in the constellation Tucana, and was discovered in the Hubble Deep Field South survey. It is the most massive spiral galaxy found in the survey,^[1] measuring 130,000 light-years (40,000 parsecs) in diameter.^[2] It is located approximately 6 billion light-years (1.8 billion parsecs) from Earth^[2] and has a mass greater than 1000 billion times the mass of the Sun, making it about four times as massive as the Milky Way.^[1]

It was once thought to be the largest spiral galaxy in the universe,^[1] but it has since been dethroned by NGC 6872.^[3]

See also

• List of galaxies

External links

• "Massive spiral galaxy ISOHDFS 27" by the European Southern Observatory
• ISOHDFS 27 on SIMBAD
• ISOHDFS 27 on NASA/IPAC Extragalactic Database

References

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