Arp 240

Short description: Pair of interacting galaxies in the constellation Virgo

Arp 240

Arp 240. The two galaxies are NGC 5257 (right) and NGC 5258 (left).

Observation data (J2000 epoch)
Constellation| Virgo
Right ascension| Right: 13h 39m 52.3s[1]
Left: 13h 39m 57.7s[2]
Declination| Right: +00° 50′ 22″[1]
Left: +00° 49′ 51″[2]
Redshift| Right: 6798 ± 9 km/s[1]
Left: 6757 ± 1 km/s[2]
Distance| Right: 345.1 Mly
(105.8 Mpc)[3]
Left: 342.1 Mly
(104.9 Mpc)[3]
Apparent magnitude (V)| 12.9 / 12.9[1][2]
Characteristics
Type| Right: SAB(s)b pec[1]
Left: SA(s)b pec[2]
Apparent size (V)| Right: 1.8′ × 0.9′[1]Left: 1.7′ × 1.1′[1]
Notable features| Interacting galaxies
Other designations
Right: NGC 5257, UGC 8641, PGC 48330, VV 55b[1]
Left: NGC 5258, UGC 8645, PGC 48338, VV 55a[1]

The location of Arp 240 (circled in red)

Arp 240 is a pair of interacting spiral galaxies located in the constellation Virgo. The two galaxies are listed together as Arp 240 in the Atlas of Peculiar Galaxies.[4] The galaxy on the right is known as NGC 5257, while the galaxy on the left is known as NGC 5258. Both galaxies are distorted by the gravitational interaction, and both are connected by a tidal bridge, as can be seen in images of these galaxies.

One supernova has been observed in NGC 5258: SN 2020dko (type Ia, mag. 19).[5]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "NASA/IPAC Extragalactic Database". Results for NGC 5257. http://nedwww.ipac.caltech.edu/.
2. ↑ 2.0 2.1 2.2 2.3 2.4 "NASA/IPAC Extragalactic Database". Results for NGC 5258. http://nedwww.ipac.caltech.edu/.
3. ↑ 3.0 3.1 Mould, Jeremy R. (2000). "The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant". The Astrophysical Journal 529 (2): 786–794. doi:10.1086/308304. Bibcode: 2000ApJ...529..786M.
4. ↑ H. Arp (1966). "Atlas of Peculiar Galaxies". Astrophysical Journal Supplement 14: 1–20. doi:10.1086/190147. Bibcode: 1966ApJS...14....1A.
5. ↑ Transient Name Server entry for SN 2020dko. Retrieved 25 March 2023.

## External links

* v
* t
* e

Virgo constellation

Stars
(list)|

| Bayer|

* α (Spica)
* β (Zavijava)
* γ (Porrima)
* δ (Minelauva)
* ε (Vindemiatrix)
* ζ (Heze)
* η (Zaniah)
* θ
* ι (Syrma)
* κ (Kang)
* λ (Khambalia)
* μ
* ν
* ξ
* ο
* π
* ρ
* σ
* τ
* υ
* φ (Elgafar)
* χ
* ψ
* ω

|

Flamsteed|

* 4 (A1)
* 6 (A2)
* 7 (b)
* 10
* 11
* 12
* 13
* 14
* 16 (c)
* 17
* 20
* 21 (q)
* 25 (f)
* 27
* 28
* 31 (d1)
* 32 (d2)
* 33
* 34
* 35
* 37
* 38
* 39
* 41
* 44 (k)
* 46
* 48
* 49
* 50
* 53
* 54
* 55
* 56
* 57
* 58
* 59 (e)
* 61
* 62
* 63
* 64
* 65
* 66
* 68 (i)
* 69
* 70
* 71
* 72
* 73
* 74 (l)
* 75
* 76 (h)
* 77
* 78 (o)
* 80
* 81
* 82 (m)
* 83
* 84
* 85
* 86
* 87
* 88
* 89
* 90 (p)
* 92
* 94
* 95
* 96
* 97
* 103
* 104
* 106
* 108
* 109
* 110
* 1 Ser (M)
* 2 Ser

Variable|

* R
* S
* W
* RS
* RT
* SS
* ST
* SW
* TW
* TY
* UU
* UV
* UW
* UY
* XX
* AG
* AH
* AL
* AW
* AX
* AZ
* BB
* BF
* BH
* BK
* CE
* CS
* CU
* CX
* DK
* DL
* DM
* DT
* EP
* EQ
* ET
* FF
* FG
* FO
* FS
* FT
* FW
* GL
* GK
* GR
* HS
* HT
* HU
* HV
* HW
* IM
* IN
* IP
* IQ
* IS
* IV
* LN
* NN
* NY
* OU
* PP
* PX
* QS
* QZ

HR|

* 4478
* 4484
* 4510
* 4533
* 4544
* 4580
* 4587
* 4591
* 4598
* 4613
* 4657
* 4722
* 4741
* 4770
* 4772
* 4805
* 4837
* 4856
* 4877
* 4896
* 4901
* 4935
* 4957 (g)
* 4959
* 4960
* 4986
* 5013
* 5014
* 5031
* 5033
* 5037
* 5053
* 5059
* 5078
* 5086
* 5106 (y)
* 5114
* 5178
* 5183
* 5205
* 5233
* 5258
* 5272
* 5275
* 5276
* 5277
* 5283
* 5307
* 5317
* 5322
* 5332
* 5341
* 5342
* 5344
* 5353
* 5368
* 5384
* 5392
* 5418
* 5424
* 5496
* 5536
* 5584
* 5631

HD|

* 102195
* 102329
* 104078
* 104755
* 106038
* 106252
* 106270
* 106515
* 107148
* 107794
* 109271
* 112495
* 114783
* 116429
* 122577
* 124973
* 125490
* 125612
* 126614
* 128563
* 130322
* 133600

Other|

* EC 14012-1446
* G 64-12
* HAT-P-26
* K2-19
* PG 1159-035
* PG 1323-086
* PG 1325+101
* PSR B1257+12 (Lich)
* Ross 128
* SDSS J121209.31+013627.7
* SDSS J1229+1122
* ULAS J133553.45+113005.2
* WASP-16
* WASP-24
* WASP-37
* WASP-39 (Malmok)
* WASP-40/HAT-P-27
* WD 1145+017
* Wolf 424
* Wolf 485A
* Wolf 489

Star
clusters|

| Open|

* NGC 5634

|

Globular|

* HVGC-1
* Koposov I

Nebulae|

| Planetary|

* Abell 36

|

Galaxies|

| Messier|

* 49
* 58
* 59
* 60
* 61
* 84
* 86
* 87
* 89
* 90
* 104 (Sombrero Galaxy)

|

NGC|

* 3776
* 3817
* 3818
* 3833
* 3843
* 3848
* 3849
* 3852
* 3863
* 3876
* 3907
* 3907B
* 3914
* 3915
* 3952
* 3976
* 3976A
* 3979
* 4006
* 4012
* 4029
* 4030
* 4043
* 4044
* 4045
* 4045A
* 4058
* 4063
* 4067
* 4073
* 4075
* 4077
* 4079
* 4082
* 4083
* 4107
* 4116
* 4119
* 4123
* 4129
* 4139
* 4164
* 4165
* 4168
* 4176
* 4178
* 4179
* 4180
* 4191
* 4193
* 4197
* 4200
* 4201
* 4202
* 4206
* 4207
* 4215
* 4216
* 4223
* 4224
* 4233
* 4234
* 4235
* 4240
* 4241
* 4246
* 4247
* 4249
* 4252
* 4255
* 4257
* 4259
* 4260
* 4261
* 4264
* 4266
* 4267
* 4268
* 4269
* 4270
* 4273
* 4276
* 4277
* 4279
* 4281
* 4282
* 4285
* 4287
* 4289
* 4292
* 4292A
* 4294
* 4296
* 4297
* 4299
* 4300
* 4301
* 4305
* 4306
* 4307
* 4309
* 4309A
* 4313
* 4316
* 4318
* 4320
* 4324
* 4326
* 4330
* 4333
* 4334
* 4339
* 4341
* 4342
* 4343
* 4348
* 4351
* 4352
* 4353
* 4356
* 4360
* 4365
* 4366
* 4368
* 4370
* 4371
* 4376
* 4378
* 4380
* 4385
* 4387
* 4388
* 4390
* 4402
* 4403
* 4404
* 4410
* 4411
* 4412
* 4413
* 4415
* 4416
* 4417
* 4418
* 4420
* 4422
* 4423
* 4424
* 4425
* 4428
* 4429
* 4430
* 4431
* 4432
* 4433
* 4434
* 4436
* 4440
* 4442
* 4445
* 4451
* 4452
* 4453
* 4454
* 4457
* 4458
* 4461
* 4464
* 4465
* 4466
* 4467
* 4469
* 4470
* 4476
* 4478
* 4480
* 4482
* 4483
* 4484
* 4486A
* 4486B
* 4487
* 4488
* 4491
* 4492
* 4493
* 4496
* 4496B
* 4497
* 4503
* 4504
* 4517
* 4517A
* 4518
* 4518B
* 4519
* 4519A
* 4520
* 4522
* 4526
* 4527
* 4528
* 4531
* 4532
* 4533
* 4535
* 4535A
* 4536
* 4538
* 4541
* 4543
* 4544
* 4546
* 4550
* 4551
* 4564
* 4567
* 4568
* 4570
* 4576
* 4577
* 4578
* 4580
* 4581
* 4584
* 4586
* 4587
* 4588
* 4592
* 4593
* 4596
* 4597
* 4598
* 4599
* 4600
* 4602
* 4604
* 4606
* 4607
* 4608
* 4612
* 4620
* 4623
* 4626
* 4628
* 4629
* 4630
* 4632
* 4636
* 4637
* 4638
* 4639
* 4640
* 4640B
* 4641
* 4642
* 4643
* 4747 ([[Arp 116]])
* 4653
* 4654
* 4658
* 4660
* 4663
* 4664
* 4666
* 4668
* 4671
* 4674
* 4678
* 4680
* 4682
* 4684
* 4688
* 4690
* 4691
* 4694
* 4697
* 4698
* 4699
* 4700
* 4701
* 4703
* 4705
* 4708
* 4713
* 4716
* 4717
* 4718
* 4720
* 4731
* 4731A
* 4733
* 4734
* 4739
* 4742
* 4746
* 4753
* 4754
* 4757
* 4759A
* 4760
* 4761
* 4762
* 4764
* 4765
* 4766
* 4770
* 4771
* 4772
* 4773
* 4775
* 4777
* 4778
* 4779
* 4780
* 4780A
* 4781
* 4784
* 4786
* 4790
* 4791
* 4795
* 4796
* 4799
* 4803
* 4808
* 4809
* 4810
* 4813
* 4818
* 4820
* 4822
* 4823
* 4825
* 4829
* 4830
* 4836
* 4838
* 4843
* 4845
* 4847
* 4855
* 4856
* 4862
* 4863
* 4866
* 4877
* 4878
* 4880
* 4885
* 4887
* 4888
* 4890
* 4897
* 4899
* 4900
* 4902
* 4904
* 4915
* 4918
* 4920
* 4924
* 4925
* 4928
* 4933
* 4933C
* 4939
* 4941
* 4942
* 4948
* 4948A
* 4951
* 4958
* 4969
* 4975
* 4981
* 4984
* 4989
* 4990
* 4991
* 4992
* 4995
* 4996
* 4997
* 4999
* 5006
* 5010
* 5013
* 5015
* 5017
* 5018
* 5019
* 5020
* 5022
* 5027
* 5028
* 5030
* 5031
* 5035
* 5036
* 5037
* 5038
* 5039
* 5044
* 5046
* 5047
* 5049
* 5050
* 5054
* 5058
* 5059
* 5060
* 5066
* 5068
* 5071
* 5072
* 5073
* 5075
* 5076
* 5077
* 5079
* 5080
* 5084
* 5087
* 5088
* 5094
* 5095
* 5097
* 5099
* 5104
* 5105
* 5106
* 5111
* 5115
* 5118
* 5119
* 5122
* 5125
* 5129
* 5130
* 5132
* 5133
* 5134
* 5136
* 5137
* 5146
* 5147
* 5148
* 5159
* 5165
* 5167
* 5170
* 5171
* 5174
* 5176
* 5177
* 5178
* 5179
* 5181
* 5183
* 5184
* 5185
* 5186
* 5191
* 5192
* 5196
* 5197
* 5202
* 5203
* 5207
* 5208
* 5209
* 5210
* 5211
* 5212
* 5213
* 5221
* 5222
* 5224
* 5226
* 5227
* 5230
* 5231
* 5232
* 5235
* 5241
* 5245
* 5246
* 5247
* 5252
* 5254
* 5261
* 5270
* 5285
* 5300
* 5306
* 5324
* 5327
* 5329
* 5331
* 5334
* 5335
* 5338
* 5339
* 5343
* 5345
* 5348
* 5356
* 5360
* 5363
* 5364
* 5366
* 5369
* 5373
* 5374
* 5382
* 5384
* 5386
* 5387
* 5392
* 5400
* 5420
* 5442
* 5468
* 5470
* 5472
* 5476
* 5478
* 5491A
* 5491B
* 5493
* 5496
* 5501
* 5506
* 5507
* 5510
* 5521
* 5534
* 5537
* 5549
* 5551
* 5552
* 5554
* 5555
* 5560
* 5563
* 5566
* 5569
* 5573
* 5574
* 5575
* 5576
* 5577
* 5584
* 5599
* 5604
* 5618
* 5619
* 5619C
* 5636
* 5638
* 5645
* 5652
* 5661
* 5668
* 5674
* 5679
* 5679A
* 5679C
* 5679D
* 5680
* 5690
* 5691
* 5692
* 5701
* 5705
* 5713
* 5718
* 5719
* 5725
* 5733
* 5738
* 5740
* 5746
* 5750
* 5765
* 5765B
* 5770
* 5774
* 5775
* 5776
* 5806
* 5811
* 5813
* 5814
* 5831
* 5838
* 5839
* 5845
* 5846
* 5846A
* 5847
* 5848
* 5850
* 5854
* 5855
* 5864
* 5865
* 5869

Other|

* A1689-zD1
* Abell 1835 IR1916
* Arp 240 (NGC 5257 and NGC 5258)
* Arp 271 (NGC 5426 and NGC 5427)
* BR 1202-0725
* 3C 273
* 3C 279
* 3C 298
* 4C 04.42
* Eyes Galaxies
* GR 8
* IC 3258
* IC 3328
* IRAS 12212+0305
* IRAS 13197−1627
* M60-UCD1
* Markarian 50
* Markarian 1318
* PG 1216+069
* PG 1244+026
* PG 1254+047
* PG 1307+085
* PG 1416−129
* PG 1426+015
* PKS 1148-001
* PKS 1167+014
* PKS 1217+023
* PKS 1229−021
* PKS 1302−102
* PKS 1335−127
* PKS 1402+044
* PKS 1405−076
* QSO B1208+1011
* QSO B1243−072
* QSO B1246−057
* QSO B1331+170
* RXJ1242−11
* SMM J14011+0252
* UM 448
* UM 461
* UM 462

Galaxy
clusters|

* Abell 1644
* Abell 1650
* Abell 1651
* Abell 1689
* Abell 1750
* Abell 1835
* Abell 2029
* Abell 2147
* HCG 62
* MKW 4
* NGC 5044 group
* RX J1347.5−1145
* Virgo Cluster

Other|

* GRB 930131
* GRB 030328
* GRB 050408
* GRB 050801
* GRB 080310
* North Polar Spur
* SN 1960F
* SN 1981B
* SN 1990B
* SN 1990N
* SN 1991T
* SN 1991bg
* SN 1994D
* SN 1999br
* SN 2002cx
* SN 2007bi
* U1.11

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Original source: https://en.wikipedia.org/wiki/Arp 240. Read more

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