Eridanus Cluster

Observation data (Epoch J2000)
Constellation(s)| Eridanus
Right ascension|  03h 28m 13.8s[1]
Declination| −20° 44′ 40″[1]
Brightest member| NGC 1232 (B)
Number of galaxies| ~200[2]
Velocity dispersion| 261 km/s[3]
Redshift| 0.005570[1]
Distance
(co-moving)| 23 Mpc (75 Mly)[1]
ICM temperature| ~107 K (~1 keV)[2]
Binding mass| ~1014[3] M☉
X-ray flux| 0.105 mCrab[2]
Other designations
Fornax II Cluster,[4] de Vaucouleurs Group 31[5]
See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters
The spiral galaxy NGC 1232 is one of the brightest in the Eridanus Cluster. The barred spiral galaxy NGC 1300 is a well-known member of the Eridanus Cluster.

The Eridanus Cluster is a galaxy cluster roughly 23 Mpc (75 Mly) from Earth, containing about 73 main galaxies and about 200 total galaxies. About 30% have Hubble classifications of elliptical or S0 and the remaining 70% are spiral or irregular.[2] These galaxies reside in smaller groups which are all loosely gravitationally bound to each other, suggesting that the system is still condensing from the Hubble flow and may eventually form a cluster of about 1014 M☉. A low velocity dispersion compared to that of, for example, the Coma Cluster, supports this hypothesis.[3] The Eridanus Cluster is located in the constellation Eridanus near the Fornax Cluster, and is sometimes called the "Fornax II Cluster".[4]

## Table of galaxies

Name of the galaxy
| Right ascension for epoch J2000
| Declination for epoch J2000
| Blue apparent magnitude of the galaxy
| Galaxy type: E=Elliptical; S0=Lenticular; Sa, Sb, Sc, Sd=Spiral (degree of woundedness of spiral arms); SBa, SBb, SBc, SBd=Barred Spiral; SAB= Intermediate Spiral (between barred and unbarred); Sm, SBm, Irr=Irregular; (r),(rs)=Ring Structure
| Angular diameter of the galaxy (arcminutes)
| Diameter of the galaxy (thousands of light years)
| Recessional velocity (km/s) of the galaxy relative to the cosmic microwave background

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Name | RA equatorial
coordinates | Dec equatorial
coordinates | Blue
Mag | Type | Size
(arcmin) | Size
(kly) | RV
(km/s)
ESO 547-09 | 03 06.0 | –19 23 | 16.8 | Irr | 1.3 | 35 | 1509
ESO 547-12 | 03 09.6 | –17 50 | 16.5 | Scd | 1.5 | 35 | 1837
NGC 1232 | 03 09.8 | –20 35 | 10.7 | SAB(rs)c | 6.9 | 170 | 1517
IC 1898 | 03 10.3 | –22 24 | 13.7 | SBc | 3.4 | 85 | 1164
ESO 547-20 | 03 13.0 | –17 56 | 16.0 | SBm | 1.2 | 30 | 1825
NGC 1258 | 03 14.1 | –21 46 | 13.9 | SBc | 1.3 | 30 | 1340
NGC 1297 | 03 19.2 | –19 06 | 13.5 | E | 2.0 | 50 | 1395
NGC 1300 | 03 19.7 | –19 25 | 11.2 | SBbc | 6.0 | 110 | 1421
NGC 1315 | 03 23.1 | –21 23 | 14.0 | S0 | 1.5 | 35 | 1534
PGC 12680 | 03 23.4 | –19 17 | ? | Irr | 1.3 | 30 | 1400
ESO 548-05 | 03 23.8 | –19 45 | 14.7 | SBm | 1.5 | 35 | 1690
NGC 1325 | 03 24.4 | –21 33 | 12.3 | SBbc | 4.7 | 115 | 1446
NGC 1325A | 03 24.8 | –21 20 | 13.6 | SBcd | 1.8 | 45 | 1188
ESO 548-16 | 03 26.0 | –21 20 | 15.6 | Scd | 1.7 | 40 | 1977
NGC 1332 | 03 26.3 | –21 20 | 11.4 | E | 4.2 | 105 | 1383
ESO 548-21 | 03 27.6 | –21 14 | 14.7 | SBd | 2.0 | 50 | 1541
ESO 548-25 | 03 29.0 | –22 09 | 15.0 | SBa | 1.3 | 30 | 1542
NGC 1345 | 03 29.5 | –17 47 | 14.3 | SBc | 1.4 | 35 | 1385
ESO 481-30 | 03 29.6 | –23 21 | 15.5 | Scd | 1.5 | 35 | 1504
NGC 1347 | 03 29.7 | –22 17 | 13.9 | SBc | 1.4 | 35 | 1624
ESO 548-28 | 03 30.6 | –17 56 | 14.0 | S0 | 1.3 | 35 | 1360
ESO 548-29 | 03 30.8 | –21 03 | 14.3 | SBbc | 1.1 | 30 | 1175
NGC 1353 | 03 32.1 | –20 49 | 12.4 | SBb | 3.5 | 85 | 1390
ESO 548-32 | 03 32.3 | –17 43 | 15.8 | SBm | 1.6 | 40 | 1815
ESO 548-33 | 03 32.5 | –18 57 | 14.5 | S0 | 1.3 | 35 | 1552
ESO 548-34 | 03 33.0 | –21 05 | 14.6 | SBc | 1.1 | 30 | 1610
ESO 482-05 | 03 33.0 | –24 08 | 15.2 | SBcd | 2.1 | 50 | 1783
NGC 1357 | 03 33.2 | –13 39 | 12.4 | Sab | 3.2 | 85 | 2018
IC 1952 | 03 33.4 | –23 43 | 13.5 | SBbc | 2.5 | 60 | 1683
IC 1953 | 03 33.7 | –21 29 | 12.7 | SBc | 2.6 | 65 | 1733
NGC 1359 | 03 33.8 | –19 29 | 13.0 | SBm | 2.1 | 55 | 1833
NGC 1362 | 03 33.9 | –20 17 | 14.2 | S0 | 1.2 | 30 | 1085
ESO 548-44 | 03 34.3 | –19 25 | 14.2 | S0 | 1.3 | 35 | 1561
ESO 548-47 | 03 34.7 | –19 02 | 14.1 | S0 | 2.5 | 60 | 1472
NGC 1367 | 03 35.0 | –24 56 | 11.6 | SBa | 5.6 | 140 | 1344
NGC 1370 | 03 35.2 | –20 22 | 13.9 | E | 1.5 | 35 | 933
IC 1962 | 03 35.6 | –21 18 | 14.8 | SBd | 2.5 | 60 | 1670
ESO 482-11 | 03 36.3 | –25 36 | 14.7 | Sbc | 1.4 | 35 | 1469
NGC 1377 | 03 36.7 | –20 54 | 13.8 | S0 | 1.7 | 45 | 1645
NGC 1385 | 03 37.5 | –24 30 | 11.5 | SBc | 3.7 | 90 | 1373
NGC 1383 | 03 37.7 | –18 20 | 13.8 | S0 | 1.7 | 40 | 1828
ESO 482-17 | 03 37.7 | –22 55 | 14.9 | Sab | 1.3 | 30 | 1330
NGC 1390 | 03 37.9 | –19 00 | 14.9 | SBa | 1.3 | 35 | 1078
NGC 1395 | 03 38.5 | –23 02 | 10.7 | E | 5.6 | 140 | 1577
NGC 1398 | 03 38.9 | –26 20 | 10.5 | SB(r)ab | 7.1 | 135 | 1289
NGC 1403 | 03 39.2 | –22 23 | 14.1 | E | 1.3 | 30 | 1751
NGC 1401 | 03 39.4 | –22 43 | 13.7 | S0 | 1.9 | 50 | 1406
NGC 1400 | 03 39.5 | –18 41 | 12.3 | E | 2.3 | 60 | 415
ESO 548-63 | 03 39.6 | –20 01 | 15.1 | Sbc | 1.4 | 35 | 1846
ESO 548-65 | 03 40.0 | –19 22 | 15.3 | Sa | 1.4 | 35 | 1102
IC 343 | 03 40.1 | –18 27 | 14.3 | S0 | 1.4 | 35 | 1730
NGC 1407 | 03 40.2 | –18 35 | 10.9 | E | 5.1 | 125 | 1650
ESO 548-68 | 03 40.3 | –18 56 | 14.3 | E | 1.3 | 35 | 1636
NGC 1412 | 03 40.5 | –26 52 | 14.7 | S0 | 1.4 | 35 | 1675
ESO 548-70 | 03 40.7 | –22 17 | 15.4 | SBcd | 1.6 | 40 | 1615
ESO 482-32 | 03 40.7 | –26 47 | 15.9 | Irr | 1.2 | 30 | 1621
NGC 1415 | 03 40.9 | –22 34 | 12.8 | Sa | 3.3 | 80 | 1451
NGC 1414 | 03 41.0 | –21 43 | 14.6 | SBbc | 1.6 | 40 | 1464
ESO 482-35 | 03 41.2 | –23 50 | 14.2 | SBab | 1.8 | 45 | 1756
NGC 1422 | 03 41.5 | –21 41 | 14.2 | SBab | 2.3 | 55 | 1514
IC 346 | 03 41.7 | –18 16 | 13.9 | S0 | 1.9 | 45 | 1830
ESO 548-79 | 03 41.9 | –18 54 | 14.8 | Sa | 1.1 | 30 | 1914
ESO 548-82 | 03 42.7 | –17 30 | 15.4 | Sbc | 1.1 | 30 | 1590
NGC 1426 | 03 42.8 | –22 06 | 12.7 | E | 2.5 | 60 | 1296
ESO 549-02 | 03 43.0 | –19 01 | 14.9 | SBm | 1.3 | 30 | 988
ESO 549-06 | 03 43.6 | –21 14 | 15.7 | Irr | 1.3 | 30 | 1490
NGC 1439 | 03 44.8 | –21 55 | 12.4 | E | 2.6 | 65 | 1577
NGC 1440 | 03 45.0 | –18 16 | 12.9 | S0 | 2.2 | 55 | 1403
NGC 1438 | 03 45.3 | –23 00 | 13.3 | SBa | 2.0 | 50 | 1438
NGC 1452 | 03 45.4 | –18 38 | 12.9 | Sa | 2.3 | 60 | 1619
ESO 549-18 | 03 48.2 | –21 28 | 13.3 | SBc | 2.5 | 60 | 1473
ESO 482-46 | 03 49.7 | –27 00 | 13.7 | Sc | 3.5 | 90 | 1422
ESO 482-49 | 03 52.4 | –23 03 | 15.3 | Sc | 1.1 | 30 | 1377
NGC 1482 | 03 54.6 | –20 30 | 13.3 | S0 | 2.2 | 55 | 1753

## See also

* List of galaxy clusters
* Coma Cluster
* Fornax Cluster
* Norma Cluster
* Virgo Cluster

## References

1. ↑ 1.0 1.1 1.2 1.3 "Eridanus Cluster". NASA/IPAC Extragalactic Database (NED). http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=ERIDANUS&extend=no.
2. ↑ 2.0 2.1 2.2 2.3 Omar, A.; Dwarakanath, K. S. (March 2005). "GMRT HI Observations of the Eridanus Group of Galaxies I". Journal of Astrophysics and Astronomy 26 (1): 1–33. doi:10.1007/BF02702451. Bibcode: 2005JApA...26....1O. http://www.ias.ac.in/jaa/mar2005/JAA416A.pdf. Retrieved 2012-02-25.
3. ↑ 3.0 3.1 3.2 Willmer, C. N. A.; Rocardi, P.; da Costa, L. Nicolaci; Pellegrini, P. S. (November 1989). "Studies of nearby poor clusters – The Eridanus group". Astronomical Journal 98 (Nov. 1989): 1531–1541. doi:10.1086/115236. ISSN 0004-6256. Bibcode: 1989AJ.....98.1531W. http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1989AJ.....98.1531W&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf. Retrieved 2012-02-25.
4. ↑ 4.0 4.1 atlasoftheuniverse.com
5. ↑ Chincarini, G.; Rood, H. J.; Welch, G. A. (March 1975). "A re-analysis of the dynamics of the nearby groups of galaxies". Monthly Notices of the Royal Astronomical Society 170 (Mar. 1975): 441–445. doi:10.1093/mnras/170.3.441. A&AA ID. AAA013.160.006. Bibcode: 1975MNRAS.170..441C.

Coordinates:  03h 28m 13.8s, −20° 44′ 40″

* v
* t
* e

Eridanus constellation

Stars (list)|

| Bayer|

* α (Achernar)
* β (Cursa)
* γ (Zaurak)
* δ
* ε (Ran)
* ζ (Zibal)
* η (Azha)
* θ1 (Acamar)
* θ2
* ι
* κ
* λ
* μ
* ν
* ξ
* ο1 (Beid)
* ο2 (Keid)
* π
* ρ1
* ρ2
* ρ3
* τ1
* τ2 (Angetenar)
* τ3
* τ4
* τ5
* τ6
* τ7
* τ8
* τ9
* υ1
* υ2 (Theemin)
* υ3 (Beemim)
* υ4
* φ
* χ
* ψ
* ω

|

Flamsteed|

* 4
* 5
* 6 (p)
* 7
* 14
* 15
* 17 (v)
* 20
* 21
* 22
* 24
* 25
* 29
* 30
* 32 (w)
* 35
* 37
* 39 (A)
* 45
* 46
* 47
* 51 (c)
* 53 (Sceptrum)
* 54
* 55
* 56
* 58
* 59
* 60
* 62 (b)
* 63
* 64
* 66
* 68

Variable|

* R
* RT
* RX
* RZ
* SV
* TZ
* UX
* UY
* XZ
* YY
* AH
* AQ
* AS
* BV
* BW
* CC
* CP
* CW
* DL
* DO
* DU
* DZ
* EF
* EI
* EK
* EL
* EM
* EP
* EX
* GU
* GW
* GY
* GZ
* KT

HR|

* 506 (q1)
* 520 (q2)
* 573
* 701
* 789 (s)
* 807
* 814
* 826
* 827
* 853
* 859
* 862
* 875
* 892
* 895
* 912
* 913
* 929
* 935
* 953
* 955
* 957
* 968
* 983
* 997
* 1016
* 1024
* 1049
* 1050
* 1060
* 1062
* 1075
* 1076
* 1091
* 1098
* 1106 (y)
* 1108
* 1116
* 1117
* 1120
* 1125
* 1139
* 1143 (h)
* 1157
* 1182
* 1186
* 1187
* 1189 (f)
* 1190 (f)
* 1195 (g)
* 1206
* 1214 (i)
* 1219
* 1232
* 1235
* 1246
* 1249
* 1258
* 1263
* 1265
* 1267
* 1272
* 1274
* 1275
* 1293
* 1299
* 1332
* 1353
* 1359
* 1366
* 1367
* 1374
* 1384
* 1386
* 1410
* 1421
* 1431
* 1438
* 1439
* 1447
* 1450
* 1452
* 1461
* 1462
* 1476
* 1483
* 1487
* 1488
* 1495
* 1513
* 1521
* 1536
* 1545
* 1579
* 1595
* 1614
* 1625
* 1671

HD|

* 11965
* 12894
* 13808
* 18742
* 19210
* 19850
* 20356
* 22379
* 24098
* 24834
* 26584
* 26625
* 27660
* 28185
* 29163
* 30562
* 30856
* 30963

Gliese|

* Gliese 86
* GJ 180
* GJ 1062
* Gliese 3293

Other|

* 82 G. (e)
* DEN 0255−4700
* GD 50
* HIP 12961
* L 369-44
* LHS 1723
* LP 771-095
* 2MASS J04151954−0935066
* 2MASS J04390101−2353083
* WASP-22
* WASP-50
* WASP-78
* WASP-79

Former|

* WX (V1241 Tauri)

Galaxies|

| NGC|

* 685
* 745
* 754
* 782
* 795
* 852
* 939
* 954
* 979
* 1081
* 1082
* 1083
* 1084
* 1089
* 1091
* 1092
* 1098
* 1099
* 1100
* 1102
* 1103
* 1108
* 1110
* 1114
* 1118
* 1119
* 1120
* 1121
* 1125
* 1126
* 1132
* 1133
* 1139
* 1140
* 1145
* 1148
* 1150
* 1151
* 1152
* 1154
* 1155
* 1157
* 1158
* 1162
* 1163
* 1172
* 1179
* 1180
* 1181
* 1182
* 1185
* 1187
* 1188
* 1189
* 1190
* 1191
* 1192
* 1195
* 1196
* 1199
* 1200
* 1202
* 1203
* 1204
* 1205
* 1206
* 1208
* 1209
* 1214
* 1215
* 1216
* 1221
* 1222
* 1223
* 1225
* 1228
* 1229
* 1230
* 1231
* 1232
* 1234
* 1238
* 1239
* 1241
* 1242
* 1247
* 1248
* 1253
* 1256
* 1258
* 1262
* 1263
* 1266
* 1269
* 1284
* 1285
* 1286
* 1287
* 1289
* 1290
* 1291
* 1295
* 1296
* 1297
* 1298
* 1299
* 1300
* 1301
* 1303
* 1304
* 1305
* 1307
* 1308
* 1309
* 1314
* 1315
* 1319
* 1320
* 1321
* 1322
* 1323
* 1324
* 1325
* 1328
* 1329
* 1331
* 1332
* 1337
* 1338
* 1345
* 1346
* 1347
* 1352
* 1353
* 1354
* 1355
* 1357
* 1358
* 1359
* 1361
* 1362
* 1363
* 1364
* 1368
* 1369
* 1370
* 1372
* 1376
* 1377
* 1383
* 1386
* 1388
* 1389
* 1390
* 1391
* 1393
* 1394
* 1395
* 1397
* 1400
* 1401
* 1402
* 1403
* 1404
* 1405
* 1407
* 1413
* 1414
* 1415
* 1416
* 1417
* 1418
* 1419
* 1421
* 1422
* 1423
* 1424
* 1426
* 1427A
* 1434
* 1436
* 1437
* 1438
* 1439
* 1440
* 1441
* 1442
* 1445
* 1447
* 1449
* 1450
* 1451
* 1452
* 1453
* 1455
* 1458
* 1460
* 1461
* 1464
* 1467
* 1468
* 1470
* 1471
* 1472
* 1475
* 1477
* 1478
* 1481
* 1482
* 1484
* 1486
* 1487
* 1489
* 1492
* 1504
* 1505
* 1507
* 1509
* 1516
* 1518
* 1519
* 1521
* 1524
* 1525
* 1531
* 1532
* 1537
* 1538
* 1540
* 1540
* 1547
* 1552
* 1561
* 1562
* 1563
* 1564
* 1565
* 1568
* 1575
* 1576
* 1577
* 1580
* 1583
* 1584
* 1586
* 1591
* 1592
* 1594
* 1597
* 1599
* 1600
* 1601
* 1603
* 1604
* 1606
* 1607
* 1609
* 1611
* 1612
* 1613
* 1614
* 1618
* 1620
* 1621
* 1622
* 1623
* 1625
* 1626
* 1627
* 1628
* 1630
* 1631
* 1632
* 1635
* 1636
* 1637
* 1638
* 1640
* 1643
* 1645
* 1646
* 1648
* 1650
* 1653
* 1654
* 1656
* 1657
* 1659
* 1665
* 1666
* 1667
* 1677
* 1681
* 1686
* 1689
* 1692
* 1694
* 1699
* 1700
* 1720
* 1721
* 1723
* 1725
* 1726
* 1728
* 1741
* 1752
* 1779
* 1797
* 1799

|

Other|

* Eridanus II
* ESO 198-13
* IC 2006
* LEDA 74886

Galaxy clusters|

* Abell 383
* Eridanus Cluster
* Eridanus Group
* MACS J0416.1-2403

Other|

* GRB 080913

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