Galaxies

64 158 CATALOGUED

Gravitationally bound systems of stars, gas and dark matter — the structures the universe organises itself into.

PRIMER — 60 SECONDS

Reading the Hubble type

E is elliptical, S is spiral, SB is barred spiral, Irr is irregular. The trailing letter grades how tightly the arms wind: Sa is tight, Sc is open.

Why distances are uncertain

Beyond the local group, distance is inferred from redshift, which needs an expansion rate to convert. That rate is measured two ways that disagree — Planck's 67.4 km/s/Mpc and SH0ES's 73.04 — so every redshift distance here carries ±4% that no telescope can remove until that argument ends. This catalogue divides by the round number between them, H0 = 70, and it does the dividing itself for every galaxy: the redshifts come from several surveys, and where one published distances under an expansion rate of its own, the conversion was re-run rather than the number copied, so that two galaxies in one cluster are not 3.5% apart for a reason that has nothing to do with either. The error bar beside the number carries that ±4%, and adds the galaxy's own motion through space to it.

Photometric and spectroscopic redshifts

A spectroscopic redshift is measured: the lines in the spectrum are where they are, and the number is good to a few per cent. A photometric redshift is fitted — the galaxy's colours through a handful of filters, matched against templates — and GLADE+, which supplies most of the galaxies here, gives it a standard deviation of 20% of itself. The distance says which one it came from, and the error bar beside a photometric one is several times wider than a spectroscopic neighbour's for that reason and not because the galaxy is further away.

[

THE FAMOUS ONES

] 12 ENTRIES
BY CONSTELLATION · 87 REGIONS
Wolf-Lundmark-Melotte
Irregular galaxy IB
10.76 V
Cetus
Whirlpool Galaxy
Intermediate spiral galaxy SABb
23.60 Mly
8.36 V
Canes Venatici
Whale Galaxy
Barred spiral galaxy SBcd
40.54 Mly
9.24 V
Canes Venatici
Virgo Galaxy
Elliptical galaxy E
53.50 Mly
9.00 V
Virgo
Umbrella Galaxy
Spiral galaxy Sc
47.22 Mly
10.82 V
Coma Berenices
UGC 9999
Galaxy
444.1 Mly
14.23 B
Serpens
UGC 9997
Galaxy
554.4 Mly
15.45 B
Boötes
UGC 9996
Galaxy
469.7 Mly
15.32 B
Serpens
UGC 9995
Galaxy
568.8 Mly
14.90 B
Boötes
UGC 9994
Galaxy
468.7 Mly
15.74 B
Corona Borealis
UGC 9993
Galaxy
536.4 Mly
17.13 B
Serpens
UGC 9992
Spiral galaxy Sd-Im
55.06 Mly
14.40 B
Draco
UGC 9991
Spiral galaxy Scd
85.56 Mly
14.11 B
Serpens
UGC 9990
Spiral galaxy SA
272.3 Mly
14.62 B
Serpens
UGC 999
Galaxy
746.6 Mly
15.55 B
Pisces
UGC 9989
Spiral galaxy Sb
218.2 Mly
14.85 B
Serpens
UGC 9988
Galaxy
329.7 Mly
16.78 B
Boötes
UGC 9986
Galaxy
532.3 Mly
15.10 B
Draco
UGC 9984
Galaxy
508.8 Mly
15.25 B
Serpens
UGC 9982
Galaxy
387.8 Mly
15.41 B
Ursa Minor
UGC 9981
Galaxy
543.1 Mly
15.11 B
Boötes
UGC 9980
Intermediate spiral galaxy SAB_a
164.8 Mly
14.68 B
Serpens
UGC 998
Barred spiral galaxy SB
254.1 Mly
15.81 B
Cetus
UGC 9979
Irregular galaxy I
84.35 Mly
13.87 B
Serpens
UGC 9978
Galaxy
347.2 Mly
15.60 B
Serpens
UGC 9977
Spiral galaxy S
105.3 Mly
13.00 B
Serpens
UGC 9976
Galaxy
576.1 Mly
15.41 B
Serpens
UGC 9972
Galaxy
209.9 Mly
15.06 B
Draco
UGC 9970
Spiral galaxy SA_B
279.9 Mly
15.25 B
Boötes
UGC 9968
Galaxy
470.5 Mly
14.76 B
Serpens
UGC 9966
Galaxy
366.3 Mly
15.51 B
Ursa Minor
UGC 9964
Galaxy
542.8 Mly
15.05 B
Serpens
UGC 9962
Irregular galaxy Irr
151.2 Mly
14.53 B
Serpens
UGC 9960
Galaxy
502.9 Mly
14.96 B
Serpens
UGC 996
Lenticular galaxy SO-a
305.1 Mly
14.74 B
Cetus
UGC 9959
Barred spiral galaxy SB
261.5 Mly
13.89 B
Boötes
UGC 9958
Galaxy
631.6 Mly
14.51 B
Serpens
UGC 9957
Galaxy
647.3 Mly
16.04 B
Boötes
UGC 9956
Galaxy
452.1 Mly
14.94 B
Serpens
UGC 9955
Galaxy
468.5 Mly
15.87 B
Ursa Minor
UGC 9954
Galaxy
495.2 Mly
14.82 B
Serpens
UGC 9953
Galaxy
473.0 Mly
15.40 B
Serpens
UGC 9951
Intermediate spiral galaxy SABd
99.36 Mly
15.01 B
Serpens
UGC 9950
Spiral galaxy Sbc
325.8 Mly
13.97 B
Ursa Minor
UGC 9949
Spiral galaxy Sc
246.8 Mly
14.43 B
Serpens
UGC 9947
Spiral galaxy SA_B
310.7 Mly
16.64 B
Boötes
UGC 9944
Galaxy
355.5 Mly
14.66 B
Ursa Minor
UGC 9942
Galaxy
348.7 Mly
15.63 B
Ursa Minor
UGC 9941
Spiral galaxy Sm/Im
85.04 Mly
14.40 B
Serpens
UGC 994
Galaxy
447.4 Mly
15.58 B
Pisces
UGC 9938
Barred spiral galaxy SB
112.6 Mly
15.74 B
Corona Borealis
UGC 9937
Spiral galaxy S
193.7 Mly
14.09 B
Serpens
UGC 9936
Intermediate spiral galaxy SAB
141.5 Mly
14.90 B
Boötes
UGC 9934
Barred spiral galaxy SBab
222.5 Mly
14.83 B
Draco
UGC 9927
Barred spiral galaxy SB
201.4 Mly
14.12 B
Serpens
UGC 9925
Spiral galaxy SAc
87.76 Mly
14.81 B
Serpens
UGC 9924
Galaxy
432.5 Mly
14.24 B
Boötes
UGC 9921
Galaxy
467.5 Mly
15.26 B
Corona Borealis
UGC 9920
Galaxy
445.0 Mly
14.86 B
Corona Borealis
UGC 9919
Spiral galaxy ScA(N)
147.5 Mly
13.34 B
Serpens
UGC 9917
Barred spiral galaxy SBbc
207.0 Mly
14.48 B
Serpens
UGC 9916
Galaxy
428.6 Mly
15.68 B
Serpens
UGC 9912
Barred spiral galaxy SBdm
54.68 Mly
14.00 B
Serpens
UGC 9911
Galaxy
485.8 Mly
16.08 B
Boötes
UGC 9910
Spiral galaxy SA
113.1 Mly
15.20 B
Corona Borealis
UGC 9907
Galaxy
452.4 Mly
15.60 B
Serpens
UGC 9905
Spiral galaxy Sc
252.6 Mly
14.18 B
Serpens
UGC 9901
Spiral galaxy ScA(N)
147.7 Mly
13.73 B
Serpens
UGC 9900
Spiral galaxy
181.0 Mly
15.03 B
Serpens
UGC 990
Barred spiral galaxy SBm
104.3 Mly
17.29 B
Pisces
UGC 99
Spiral galaxy Sm
76.89 Mly
12.49 B
Pegasus
UGC 9898
Galaxy
336.2 Mly
15.89 B
Serpens
UGC 9897
Galaxy
481.9 Mly
14.45 B
Serpens
UGC 9896
Spiral galaxy Sc
305.0 Mly
14.21 B
Ursa Minor
UGC 9894
Galaxy
431.5 Mly
15.34 B
Serpens
UGC 9893
Spiral galaxy Sm/Im
76.56 Mly
14.80 B
Boötes
UGC 9892
Spiral galaxy Sbc
257.7 Mly
14.31 B
Boötes
UGC 9891
Galaxy
401.1 Mly
15.29 B
Boötes
UGC 9890
Spiral galaxy SA_B
280.8 Mly
14.98 B
Boötes
UGC 989
Intermediate spiral galaxy SABm
91.01 Mly
15.86 B
Pisces
UGC 9889
Galaxy
573.9 Mly
15.14 B
Serpens
UGC 9887
Galaxy
629.2 Mly
15.31 B
Serpens
UGC 9886
Galaxy
538.0 Mly
14.33 B
Serpens
UGC 9883
Spiral galaxy Sb
175.9 Mly
14.97 B
Boötes
UGC 9882
Galaxy
358.3 Mly
14.82 B
Boötes
UGC 9881
Galaxy
724.8 Mly
15.76 B
Ursa Minor
UGC 9880
Barred spiral galaxy SB
145.3 Mly
16.46 B
Boötes
UGC 9879
Galaxy
681.9 Mly
15.57 B
Corona Borealis
UGC 9878
Spiral galaxy Sbc
321.8 Mly
14.22 B
Ursa Minor
UGC 9875
Intermediate spiral galaxy SAB
115.2 Mly
15.56 B
Serpens
UGC 9874
Elliptical galaxy E
263.8 Mly
14.38 B
Ursa Minor
UGC 9873
Spiral galaxy Sb
265.1 Mly
14.83 B
Boötes
UGC 9872
Spiral galaxy Sc
307.3 Mly
14.08 B
Ursa Minor
UGC 987
Spiral galaxy Sa
243.5 Mly
13.87 B
Pisces
UGC 9868
Galaxy
1.080 Gly
15.33 B
Draco
UGC 9865
Galaxy
693.9 Mly
15.65 B
Ursa Minor
UGC 9864
Galaxy
523.4 Mly
15.07 B
Serpens
UGC 9863
Galaxy
528.1 Mly
15.22 B
Serpens
UGC 9860
Galaxy
475.0 Mly
15.88 B
Corona Borealis
UGC 9859
Galaxy
492.8 Mly
14.90 B
Corona Borealis