MACS J1149 Lensed Star 1 information

MACS J1149 Lensed Star 1
	; Detection of MACS J1149 Lensed Star 1; A galactic cluster (left) magnified a distant star (now named Icarus) more than 2,000 times, making it visible in 2016 from Earth (lower right), 9.34 billion light-years away—although visible in 2016, the star was not visible in 2011 (upper right).
Observation data; Epoch J2000 Equinox J2000
Constellation	Leo
Right ascension	11h 49m 35.59s
Declination	22° 23′ 47.4″
Astrometry
Distance	Redshift of 1.49 yields comoving distances of 14.4 billion ly
Characteristics
Spectral type	B
Apparent magnitude (V)	≈28.4 (normally 29.9)
Apparent magnitude (R)	≈28.2 (normally 29.7)
Apparent magnitude (Z)	≈27.9 (normally 29.4)
Apparent magnitude (J)	27.3 (normally 28.8)
Apparent magnitude (H)	27.4 (normally 28.9)
Details
Surface gravity (log g)	2 - 4 cgs
Temperature	11,000 – 14,000 K
Metallicity	≈0.006
Age	~8 Myr
Other designations
	Icarus, LS1, MACS J1149 LS1, MACS J1149 Lensed Star 1 (LS1), MACS J1149+2223 Lensed Star 1

MACS J1149 Lensed Star 1, also known as Icarus,^{[note 2]} is a blue supergiant star observed through a gravitational lens. It is the seventh most distant individual star to have been detected so far (after Earendel, Godzilla, Mothra, Quyllur, star-1 and star-2), at approximately 14 billion light-years from Earth (redshift z=1.49; comoving distance of 14.4 billion light-years; lookback time of 9.34 billion years).^[3]^[2]^[4]^[5]^[6]^[7]^[8] Light from the star was emitted 4.4 billion years after the Big Bang.^[7] According to co-discoverer Patrick Kelly, the star is at least a hundred times more distant than the next-farthest non-supernova star observed, SDSS J1229+1122, and is the first magnified individual star seen.^[4]^[7]

^ ^a ^b ^c ^d Kelly, P. L. (2015). "Multiple images of a highly magnified supernova formed by an early-type cluster galaxy lens". Science. 347 (6226): 1123–1126. arXiv:1411.6009. Bibcode:2015Sci...347.1123K. doi:10.1126/science.aaa3350. PMID 25745167. S2CID 206633888.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Kelly, Patrick L.; et al. (2 April 2018). "Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens". Nature Astronomy. 2 (4): 334–342. arXiv:1706.10279. Bibcode:2018NatAs...2..334K. doi:10.1038/s41550-018-0430-3. S2CID 125826925.
^ Staff (2018). "Cosmological information and results: redshift z=1.49". Wolfram Alpha. Retrieved 4 April 2018.
^ ^a ^b Jenkins, Ann; Villard, Ray; Kelly, Patrick (2 April 2018). "Hubble Uncovers the Farthest Star Ever Seen". NASA. Retrieved 2 April 2018.
^ Howell, Elizabeth (2 April 2018). "Rare Cosmic Alignment Reveals Most Distant Star Ever Seen". Space.com. Retrieved 2 April 2018.
^ Sanders, Robert (2 April 2018). "Hubble peers through cosmic lens to capture most distant star ever seen". Berkeley News. Retrieved 2 April 2018.
^ ^a ^b ^c Parks, Jake (2 April 2018). "Hubble spots farthest star ever seen". Astronomy. Retrieved 2 April 2018.
^ Cite error: The named reference RTRS-20180402 was invoked but never defined (see the help page).

Cite error: There are <ref group=note> tags on this page, but the references will not show without a {{reflist|group=note}} template (see the help page).

[sci-1] Kelly, P. L. (2015). "Multiple images of a highly magnified supernova formed by an early-type cluster galaxy lens". Science. 347 (6226): 1123–1126. arXiv:1411.6009. Bibcode:2015Sci...347.1123K. doi:10.1126/science.aaa3350. PMID 25745167. S2CID 206633888.

[NA-20180402-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Kelly, Patrick L.; et al. (2 April 2018). "Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens". Nature Astronomy. 2 (4): 334–342. arXiv:1706.10279. Bibcode:2018NatAs...2..334K. doi:10.1038/s41550-018-0430-3. S2CID 125826925.

[WAlpha-5] Staff (2018). "Cosmological information and results: redshift z=1.49". Wolfram Alpha. Retrieved 4 April 2018.

[NASA-20180402-6] Jenkins, Ann; Villard, Ray; Kelly, Patrick (2 April 2018). "Hubble Uncovers the Farthest Star Ever Seen". NASA. Retrieved 2 April 2018.

[SPC-20180402-7] Howell, Elizabeth (2 April 2018). "Rare Cosmic Alignment Reveals Most Distant Star Ever Seen". Space.com. Retrieved 2 April 2018.

[BN-20180402-8] Sanders, Robert (2 April 2018). "Hubble peers through cosmic lens to capture most distant star ever seen". Berkeley News. Retrieved 2 April 2018.

[AM-20180402-9] Parks, Jake (2 April 2018). "Hubble spots farthest star ever seen". Astronomy. Retrieved 2 April 2018.

[RTRS-20180402-10] Cite error: The named reference RTRS-20180402 was invoked but never defined (see the help page).

Observation data Epoch J2000^[1] Equinox J2000^[1]
Detection of MACS J1149 Lensed Star 1 A galactic cluster (left) magnified a distant star (now named Icarus) more than 2,000 times, making it visible in 2016 from Earth (lower right), 9.34 billion light-years away—although visible in 2016, the star was not visible in 2011 (upper right).
Constellation	Leo^[1]^[2]
Right ascension	11^h 49^m 35.59^s^[1]
Declination	22° 23′ 47.4″^[1]
Astrometry

Distance	Redshift of 1.49 yields comoving distances of 14.4 billion ly

Characteristics
Spectral type	B^[2]
Apparent magnitude (V)	≈28.4^[2] (normally 29.9)^{[note 1]}
Apparent magnitude (R)	≈28.2^[2] (normally 29.7)
Apparent magnitude (Z)	≈27.9^[2] (normally 29.4)
Apparent magnitude (J)	27.3^[2] (normally 28.8)
Apparent magnitude (H)	27.4^[2] (normally 28.9)
Details

Surface gravity (log g)	2 - 4^[2] cgs
Temperature	11,000 – 14,000^[2] K
Metallicity	≈0.006^[2]
Age	~8^[2] Myr

Other designations
Icarus, LS1, MACS J1149 LS1, MACS J1149 Lensed Star 1 (LS1), MACS J1149+2223 Lensed Star 1

MACS J1149 Lensed Star 1 information

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