List of the most distant astronomical objects
Timeline of most distant astronomical object recordholders
Objects in this list were found to be the most distant object at the time of determination of their distance. This is frequently not the same as the date of their discovery.

List of the most distant astronomical objects

Section Title: Timeline of most distant astronomical object recordholders
Table Section Text: Objects in this list were found to be the most distant object at the time of determination of their distance. This is frequently not the same as the date of their discovery.

Object	Type	Date	Distance (z = Redshift)	Notes

GN-z11	Galaxy	2016—	z = 11.09

EGSY8p7	Galaxy	2015 − 2016	z = 8.68

Progenitor of GRB 090423 / Remnant of GRB 090423	Gamma-ray burst progenitor / Gamma-ray burst remnant	2009 − 2015	z = 8.2

IOK-1	Galaxy	2006 − 2009	z = 6.96

SDF J132522.3+273520	Galaxy	2005 − 2006	z = 6.597

SDF J132418.3+271455	Galaxy	2003 − 2005	z = 6.578

HCM-6A	Galaxy	2002 − 2003	z = 6.56	The galaxy is lensed by galaxy cluster Abell 370. This was the first non-quasar galaxy found to exceed redshift 6.

SDSS J1030+0524 (SDSSp J103027.10+052455.0)	Quasar	2001 − 2002	z = 6.28

SDSS 1044-0125 (SDSSp J104433.04-012502.2)	Quasar	2000 − 2001	z = 5.82

SSA22-HCM1	Galaxy	1999 − 2000	z>=5.74

HDF 4-473.0	Galaxy	1998 − 1999	z = 5.60

RD1 (0140+326 RD1)	Galaxy	1998	z = 5.34

CL 1358+62 G1 & CL 1358+62 G2	Galaxies	1997 − 1998	z = 4.92	These were the most remote objects discovered at the time. The pair of galaxies were found lensed by galaxy cluster CL1358+62 (z = 0.33).

PC 1247-3406	Quasar	1991 − 1997	z = 4.897

PC 1158+4635	Quasar	1989 − 1991	z = 4.73

Q0051-279	Quasar	1987 − 1989	z = 4.43

Q0000-26 (QSO B0000-26)	Quasar	1987	z = 4.11

PC 0910+5625 (QSO B0910+5625)	Quasar	1987	z = 4.04	This was the second quasar discovered with a redshift over 4.

Q0046–293 (QSO J0048-2903)	Quasar	1987	z = 4.01

Q1208+1011 (QSO B1208+1011)	Quasar	1986 − 1987	z = 3.80	This is a gravitationally-lensed double-image quasar, and at the time of discovery to 1991, had the least angular separation between images, 0.45 ″.

PKS 2000-330 (QSO J2003-3251, Q2000-330)	Quasar	1982 − 1986	z = 3.78	'

OQ172 (QSO B1442+101)	Quasar	1974 − 1982	z = 3.53

OH471 (QSO B0642+449)	Quasar	1973 − 1974	z = 3.408	Nickname was "the blaze marking the edge of the universe".

4C 05.34	Quasar	1970 − 1973	z = 2.877	Its redshift was so much greater than the previous record that it was believed to be erroneous, or spurious.

5C 02.56 (7C 105517.75+495540.95)	Quasar	1968 − 1970	z = 2.399

4C 25.05 (4C 25.5)	Quasar	1968	z = 2.358

PKS 0237-23 (QSO B0237-2321)	Quasar	1967 − 1968	z = 2.225

4C 12.39 (Q1116+12, PKS 1116+12)	Quasar	1966 − 1967	z = 2.1291

4C 01.02 (Q0106+01, PKS 0106+1)	Quasar	1965 − 1966	z = 2.0990

3C 9	Quasar	1965	z = 2.018

3C 147	Quasar	1964 − 1965	z = 0.545

3C 295	Radio galaxy	1960 − 1964	z = 0.461

LEDA 25177 (MCG+01-23-008)	Brightest cluster galaxy	1951 − 1960	z = 0.2 (V = 61000 km/s)	This galaxy lies in the Hydra Supercluster. It is located at B1950.0 08h 55m 4s +03° 21′ and is the BCG of the fainter Hydra Cluster Cl 0855+0321 (ACO 732).

LEDA 51975 (MCG+05-34-069)	Brightest cluster galaxy	1936 –	z = 0.13 (V = 39000 km/s)	The brightest cluster galaxy of the Bootes Cluster (ACO 1930), an elliptical galaxy at B1950.0 14h 30m 6s +31° 46′ apparent magnitude 17.8, was found by Milton L.

LEDA 20221 (MCG+06-16-021)	Brightest cluster galaxy	1932 –	z = 0.075 (V = 23000 km/s)	This is the BCG of the Gemini Cluster (ACO 568) and was located at B1950.0 07h 05m 0s +35° 04′

BCG of WMH Christie's Leo Cluster	Brightest cluster galaxy	1931 − 1932	z = (V = 19700 km/s)

BCG of Baede's Ursa Major Cluster	Brightest cluster galaxy	1930 − 1931	z = (V = 11700 km/s)

NGC 4860	Galaxy	1929 − 1930	z = 0.026 (V = 7800 km/s)

NGC 7619	Galaxy	1929	z = 0.012 (V = 3779 km/s)	Using redshift measurements, NGC 7619 was the highest at the time of measurement. At the time of announcement, it was not yet accepted as a general guide to distance, however, later in the year, Edwin Hubble described redshift in relation to distance, which became accepted widely as an inferred distance.

NGC 584 (Dreyer nebula 584)	Galaxy	1921 − 1929	z = 0.006 (V = 1800 km/s)	At the time, nebula had yet to be accepted as independent galaxies. However, in 1923, galaxies were generally recognized as external to the Milky Way.

M104 (NGC 4594)	Galaxy	1913 − 1921	z = 0.004 (V = 1180 km/s)	This was the second galaxy whose redshift was determined; the first being Andromeda – which is approaching us and thus cannot have its redshift used to infer distance.

Arcturus (Alpha Bootis)	Star	1891 − 1910	160 ly (18 mas) (this is very inaccurate, true=37 ly)	This number is wrong; originally announced in 1891, the figure was corrected in 1910 to 40 ly (60 mas). From 1891 to 1910, it had been thought this was the star with the smallest known parallax, hence the most distant star whose distance was known.

Capella (Alpha Aurigae)	Star	1849 -	72 ly (46 mas)

Polaris (Alpha Ursae Minoris)	Star	1847 - 1849	50 ly (80 mas) (this is very inaccurate, true=~375 ly)

Vega (Alpha Lyrae)	Star (part of a double star pair)	1839 - 1847	7.77 pc (125 mas)

61 Cygni	Binary star	1838 − 1839	3.48 pc (313.6 mas)	This was the first star other than the Sun to have its distance measured.

Uranus	Planet of the Solar System	1781 − 1838	18 AU	This was the last planet discovered before the first successful measurement of stellar parallax. It had been determined that the stars were much farther away than the planets.

Saturn	Planet of the Solar System	1619 − 1781	10 AU	From Kepler's Third Law, it was finally determined that Saturn is indeed the outermost of the classical planets, and its distance derived.

Mars	Planet of the Solar System	1609 − 1619	2.6 AU when Mars is diametrically opposed to Earth	Kepler correctly characterized Mars and Earth's orbits in the publication Astronomia nova. It had been conjectured that the fixed stars were much farther away than the planets.

Sun	Star	3rd century BC — 1609	380 Earth radii (very inaccurate, true=16000 Earth radii)	Aristarchus of Samos made a measurement of the distance of the Sun from the Earth in relation to the distance of the Moon from the Earth.

Moon	Moon of a planet	3rd century BC	20 Earth radii (very inaccurate, true=64 Earth radii)	Aristarchus of Samos made a measurement of the distance between the Earth and the Moon. The diameter of the Earth had been calculated previously.

z represents redshift, a measure of recessional velocity and inferred distance due to cosmological expansion mas represents parallax, a measure of angle and distance can be determined through trigonometry

Sentence(s)

RD1 was the most distant object in 1998.

final_sentence: RD1 was the most distant object in 1998.