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Sh 2-4

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(Redirected fromRCW 121)

Emission nebula

Sharpless 2-4
Emission nebula
H II region
As seen by theDESI Legacy Survey
Observation data:epoch
Right ascension	17^h 19^m 48.5^s
Declination	−39° 20′ 19″^[1]
Distance	8,800 ly (2,700 pc)
Apparent magnitude (V)	14.95^[2]
Apparent dimensions (V)	5'
Constellation	Scorpius

Designations	RCW 121, ESO 333-3,IRAS 17149-3916,Haro 3-6, PN H 2-6^[3]
See also:Lists of nebulae

Sh 2-4 is anemission nebula in the constellationScorpius. It is part of theSharpless Catalog assembled byStewart Sharpless.^[4] It was originally misidentified as aplanetary nebula. The incorrect planetary designation PN H 2-6 can still be used as an identifier. It may be associated with the star cluster Havlen-Moffat 1.^[1]

Visibility

[edit]

The nebula is bright, and visible with longer exposure. The nebula mostly emits red light, making viewing through ahydrogen-alpha filter effective.^[5]

Structure

[edit]

Havlen-Moffat 1 is known to be a source of ionization within Sh 2-4. The nebula contains twoWolf-Rayet stars, designated WR 87 and WR 89.^[6] Contained within the nebula is the infrared cluster [DBS2003] 118.^[7]

References

[edit]

^^a ^b"The Sharpless Observing Atlas"(PDF).
^"Sharpless (Sh2) - Astrobasics". 13 September 2022.
^"RCW 121".
^"CCD Images of the Sharpless Catalog".
^"SH2-4 (Sharpless 4)".
^"RCW 121".
^Dutra, C. M.; Bica, E.; Soares, J.; Barbuy, B. (2003)."New infrared star clusters in the southern Milky Way with 2MASS".Astronomy and Astrophysics.400 (2): 533.arXiv:astro-ph/0301221.Bibcode:2003A&A...400..533D.doi:10.1051/0004-6361:20030005.

v t e RCW Catalogue
RCW 1 RCW 2 RCW 3 RCW 4 RCW 5 RCW 6 RCW 7 RCW 8 RCW 9 RCW 10 RCW 11 RCW 12 RCW 13 RCW 14 RCW 15 RCW 16 RCW 17 RCW 18 RCW 19 RCW 20 RCW 21 RCW 22 RCW 23 RCW 24 RCW 25 RCW 26 RCW 27 RCW 28 RCW 29 RCW 30 RCW 31 RCW 32 RCW 33 RCW 34 RCW 35 RCW 36 RCW 37 RCW 38 RCW 39 RCW 40 RCW 41 RCW 42 RCW 43 RCW 44 RCW 45 RCW 46 RCW 47 RCW 48 RCW 49 RCW 50 RCW 51 RCW 52 RCW 53 RCW 54 RCW 55 RCW 56 RCW 57 RCW 58 RCW 59 RCW 60 RCW 61 RCW 62 RCW 63 RCW 64 RCW 65 RCW 66 RCW 67 RCW 68 RCW 69 RCW 70 RCW 71 RCW 72 RCW 73 RCW 74 RCW 75 RCW 76 RCW 77 RCW 78 RCW 79 RCW 80 RCW 81 RCW 82 RCW 83 RCW 84 RCW 85 RCW 86 RCW 87 RCW 88 RCW 89 RCW 90 RCW 91 RCW 92 RCW 93 RCW 94 RCW 95 RCW 96 RCW 97 RCW 98 RCW 99 RCW 100 RCW 101 RCW 102 RCW 103 RCW 104 RCW 105 RCW 106 RCW 107 RCW 108 RCW 109 RCW 110 RCW 111 RCW 112 RCW 113 RCW 114 RCW 115 RCW 116 RCW 117 RCW 118 RCW 119 RCW 120 RCW 121 RCW 122 RCW 123 RCW 124 RCW 125 RCW 126 RCW 127 RCW 128 RCW 129 RCW 130 RCW 131 RCW 132 RCW 133 RCW 134 RCW 135 RCW 136 RCW 137 RCW 138 RCW 139 RCW 140 RCW 141 RCW 142 RCW 143 RCW 144 RCW 145 RCW 146 RCW 147 RCW 148 RCW 149 RCW 150 RCW 151 RCW 152 RCW 153 RCW 154 RCW 155 RCW 156 RCW 157 RCW 158 RCW 159 RCW 160 RCW 161 RCW 162 RCW 163 RCW 164 RCW 165 RCW 166 RCW 167 RCW 168 RCW 169 RCW 170 RCW 171 RCW 172 RCW 173 RCW 174 RCW 175 RCW 176 RCW 177 RCW 178 RCW 179 RCW 180 RCW 181 RCW 182
See also:Emission nebula H I region H II region

RCW Catalogue

RCW 1
RCW 2
RCW 3
RCW 4
RCW 5
RCW 6
RCW 7
RCW 8
RCW 9
RCW 10
RCW 11
RCW 12
RCW 13
RCW 14
RCW 15
RCW 16
RCW 17
RCW 18
RCW 19
RCW 20
RCW 21
RCW 22
RCW 23
RCW 24
RCW 25
RCW 26
RCW 27
RCW 28
RCW 29
RCW 30
RCW 31
RCW 32
RCW 33
RCW 34
RCW 35
RCW 36
RCW 37
RCW 38
RCW 39
RCW 40
RCW 41
RCW 42
RCW 43
RCW 44
RCW 45
RCW 46
RCW 47
RCW 48
RCW 49
RCW 50
RCW 51
RCW 52
RCW 53
RCW 54
RCW 55
RCW 56
RCW 57
RCW 58
RCW 59
RCW 60
RCW 61
RCW 62
RCW 63
RCW 64
RCW 65
RCW 66
RCW 67
RCW 68
RCW 69
RCW 70
RCW 71
RCW 72
RCW 73
RCW 74
RCW 75
RCW 76
RCW 77
RCW 78
RCW 79
RCW 80
RCW 81
RCW 82
RCW 83
RCW 84
RCW 85
RCW 86
RCW 87
RCW 88
RCW 89
RCW 90
RCW 91
RCW 92
RCW 93
RCW 94
RCW 95
RCW 96
RCW 97
RCW 98
RCW 99
RCW 100
RCW 101
RCW 102
RCW 103
RCW 104
RCW 105
RCW 106
RCW 107
RCW 108
RCW 109
RCW 110
RCW 111
RCW 112
RCW 113
RCW 114
RCW 115
RCW 116
RCW 117
RCW 118
RCW 119
RCW 120
RCW 121
RCW 122
RCW 123
RCW 124
RCW 125
RCW 126
RCW 127
RCW 128
RCW 129
RCW 130
RCW 131
RCW 132
RCW 133
RCW 134
RCW 135
RCW 136
RCW 137
RCW 138
RCW 139
RCW 140
RCW 141
RCW 142
RCW 143
RCW 144
RCW 145
RCW 146
RCW 147
RCW 148
RCW 149
RCW 150
RCW 151
RCW 152
RCW 153
RCW 154
RCW 155
RCW 156
RCW 157
RCW 158
RCW 159
RCW 160
RCW 161
RCW 162
RCW 163
RCW 164
RCW 165
RCW 166
RCW 167
RCW 168
RCW 169
RCW 170
RCW 171
RCW 172
RCW 173
RCW 174
RCW 175
RCW 176
RCW 177
RCW 178
RCW 179
RCW 180
RCW 181
RCW 182

v t e Sharpless catalog
Sh 2-1 Sh 2-2 Sh 2-3 Sh 2-4 Sh 2-5 Sh 2-6 Sh 2-7 Sh 2-8 Sh 2-9 Sh 2-10 Sh 2-11 Sh 2-12 Sh 2-13 Sh 2-14 Sh 2-15 Sh 2-16 Sh 2-17 Sh 2-18 Sh 2-19 Sh 2-20 Sh 2-21 Sh 2-22 Sh 2-23 Sh 2-24 Sh 2-25 Sh 2-26 Sh 2-27 Sh 2-28 Sh 2-29 Sh 2-30 Sh 2-31 Sh 2-32 Sh 2-33 Sh 2-34 Sh 2-35 Sh 2-36 Sh 2-37 Sh 2-38 Sh 2-39 Sh 2-40 Sh 2-41 Sh 2-42 Sh 2-43 Sh 2-44 Sh 2-45 Sh 2-46 Sh 2-47 Sh 2-48 Sh 2-49 Sh 2-50 Sh 2-51 Sh 2-52 Sh 2-53 Sh 2-54 Sh 2-55 Sh 2-56 Sh 2-57 Sh 2-58 Sh 2-59 Sh 2-60 Sh 2-61 Sh 2-62 Sh 2-63 Sh 2-64 Sh 2-65 Sh 2-66 Sh 2-67 Sh 2-68 Sh 2-69 Sh 2-70 Sh 2-71 Sh 2-72 Sh 2-73 Sh 2-74 Sh 2-75 Sh 2-76 Sh 2-77 Sh 2-78 Sh 2-79 Sh 2-80 Sh 2-81 Sh 2-82 Sh 2-83 Sh 2-84 Sh 2-85 Sh 2-86 Sh 2-87 Sh 2-88 Sh 2-89 Sh 2-90 Sh 2-91 Sh 2-92 Sh 2-93 Sh 2-94 Sh 2-95 Sh 2-96 Sh 2-97 Sh 2-98 Sh 2-99 Sh 2-100 Sh 2-101 Sh 2-102 Sh 2-103 Sh 2-104 Sh 2-105 Sh 2-106 Sh 2-107 Sh 2-108 Sh 2-109 Sh 2-110 Sh 2-111 Sh 2-112 Sh 2-113 Sh 2-114 Sh 2-115 Sh 2-116 Sh 2-117 Sh 2-118 Sh 2-119 Sh 2-120 Sh 2-121 Sh 2-122 Sh 2-123 Sh 2-124 Sh 2-125 Sh 2-126 Sh 2-127 Sh 2-128 Sh 2-129 Sh 2-130 Sh 2-131 Sh 2-132 Sh 2-133 Sh 2-134 Sh 2-135 Sh 2-136 Sh 2-137 Sh 2-138 Sh 2-139 Sh 2-140 Sh 2-141 Sh 2-142 Sh 2-143 Sh 2-144 Sh 2-145 Sh 2-146 Sh 2-147 Sh 2-148 Sh 2-149 Sh 2-150 Sh 2-151 Sh 2-152 Sh 2-153 Sh 2-154 Sh 2-155 Sh 2-156 Sh 2-157 Sh 2-158 Sh 2-159 Sh 2-160 Sh 2-161 Sh 2-162 Sh 2-163 Sh 2-164 Sh 2-165 Sh 2-166 Sh 2-167 Sh 2-168 Sh 2-169 Sh 2-170 Sh 2-171 Sh 2-172 Sh 2-173 Sh 2-174 Sh 2-175 Sh 2-176 Sh 2-177 Sh 2-178 Sh 2-179 Sh 2-180 Sh 2-181 Sh 2-182 Sh 2-183 Sh 2-184 Sh 2-185 Sh 2-186 Sh 2-187 Sh 2-188 Sh 2-189 Sh 2-190 Sh 2-191 Sh 2-192 Sh 2-193 Sh 2-194 Sh 2-195 Sh 2-196 Sh 2-197 Sh 2-198 Sh 2-199 Sh 2-201 Sh 2-202 Sh 2-203 Sh 2-204 Sh 2-205 Sh 2-206 Sh 2-207 Sh 2-208 Sh 2-209 Sh 2-210 Sh 2-211 Sh 2-212 Sh 2-213 Sh 2-214 Sh 2-215 Sh 2-216 Sh 2-217 Sh 2-218 Sh 2-219 Sh 2-220 Sh 2-221 Sh 2-222 Sh 2-223 Sh 2-224 Sh 2-225 Sh 2-226 Sh 2-227 Sh 2-228 Sh 2-229 Sh 2-230 Sh 2-231 Sh 2-232 Sh 2-233 Sh 2-234 Sh 2-235 Sh 2-236 Sh 2-237 Sh 2-238 Sh 2-239 Sh 2-240 Sh 2-241 Sh 2-242 Sh 2-243 Sh 2-244 Sh 2-245 Sh 2-246 Sh 2-247 Sh 2-248 Sh 2-249 Sh 2-250 Sh 2-251 Sh 2-252 Sh 2-253 Sh 2-254 Sh 2-255 Sh 2-256 Sh 2-257 Sh 2-258 Sh 2-259 Sh 2-260 Sh 2-261 Sh 2-262 Sh 2-263 Sh 2-264 Sh 2-265 Sh 2-266 Sh 2-267 Sh 2-268 Sh 2-269 Sh 2-270 Sh 2-271 Sh 2-272 Sh 2-273 Sh 2-274 Sh 2-275 Sh 2-276 Sh 2-277 Sh 2-278 Sh 2-279 Sh 2-280 Sh 2-281 Sh 2-282 Sh 2-283 Sh 2-284 Sh 2-285 Sh 2-286 Sh 2-287 Sh 2-288 Sh 2-289 Sh 2-290 Sh 2-291 Sh 2-292 Sh 2-293 Sh 2-294 Sh 2-295 Sh 2-296 Sh 2-297 Sh 2-298 Sh 2-299 Sh 2-301 Sh 2-302 Sh 2-303 Sh 2-304 Sh 2-305 Sh 2-306 Sh 2-307 Sh 2-308 Sh 2-309 Sh 2-310 Sh 2-311 Sh 2-312 Sh 2-313
See also:Gum catalog Nebula RCW Catalogue Stewart Sharpless

Sharpless catalog

Sh 2-1
Sh 2-2
Sh 2-3
Sh 2-4
Sh 2-5
Sh 2-6
Sh 2-7
Sh 2-8
Sh 2-9
Sh 2-10
Sh 2-11
Sh 2-12
Sh 2-13
Sh 2-14
Sh 2-15
Sh 2-16
Sh 2-17
Sh 2-18
Sh 2-19
Sh 2-20
Sh 2-21
Sh 2-22
Sh 2-23
Sh 2-24
Sh 2-25
Sh 2-26
Sh 2-27
Sh 2-28
Sh 2-29
Sh 2-30
Sh 2-31
Sh 2-32
Sh 2-33
Sh 2-34
Sh 2-35
Sh 2-36
Sh 2-37
Sh 2-38
Sh 2-39
Sh 2-40
Sh 2-41
Sh 2-42
Sh 2-43
Sh 2-44
Sh 2-45
Sh 2-46
Sh 2-47
Sh 2-48
Sh 2-49
Sh 2-50
Sh 2-51
Sh 2-52
Sh 2-53
Sh 2-54
Sh 2-55
Sh 2-56
Sh 2-57
Sh 2-58
Sh 2-59
Sh 2-60
Sh 2-61
Sh 2-62
Sh 2-63
Sh 2-64
Sh 2-65
Sh 2-66
Sh 2-67
Sh 2-68
Sh 2-69
Sh 2-70
Sh 2-71
Sh 2-72
Sh 2-73
Sh 2-74
Sh 2-75
Sh 2-76
Sh 2-77
Sh 2-78
Sh 2-79
Sh 2-80
Sh 2-81
Sh 2-82
Sh 2-83
Sh 2-84
Sh 2-85
Sh 2-86
Sh 2-87
Sh 2-88
Sh 2-89
Sh 2-90
Sh 2-91
Sh 2-92
Sh 2-93
Sh 2-94
Sh 2-95
Sh 2-96
Sh 2-97
Sh 2-98
Sh 2-99
Sh 2-100
Sh 2-101
Sh 2-102
Sh 2-103
Sh 2-104
Sh 2-105
Sh 2-106
Sh 2-107
Sh 2-108
Sh 2-109
Sh 2-110
Sh 2-111
Sh 2-112
Sh 2-113
Sh 2-114
Sh 2-115
Sh 2-116
Sh 2-117
Sh 2-118
Sh 2-119
Sh 2-120
Sh 2-121
Sh 2-122
Sh 2-123
Sh 2-124
Sh 2-125
Sh 2-126
Sh 2-127
Sh 2-128
Sh 2-129
Sh 2-130
Sh 2-131
Sh 2-132
Sh 2-133
Sh 2-134
Sh 2-135
Sh 2-136
Sh 2-137
Sh 2-138
Sh 2-139
Sh 2-140
Sh 2-141
Sh 2-142
Sh 2-143
Sh 2-144
Sh 2-145
Sh 2-146
Sh 2-147
Sh 2-148
Sh 2-149
Sh 2-150
Sh 2-151
Sh 2-152
Sh 2-153
Sh 2-154
Sh 2-155
Sh 2-156
Sh 2-157
Sh 2-158
Sh 2-159
Sh 2-160
Sh 2-161
Sh 2-162
Sh 2-163
Sh 2-164
Sh 2-165
Sh 2-166
Sh 2-167
Sh 2-168
Sh 2-169
Sh 2-170
Sh 2-171
Sh 2-172
Sh 2-173
Sh 2-174
Sh 2-175
Sh 2-176
Sh 2-177
Sh 2-178
Sh 2-179
Sh 2-180
Sh 2-181
Sh 2-182
Sh 2-183
Sh 2-184
Sh 2-185
Sh 2-186
Sh 2-187
Sh 2-188
Sh 2-189
Sh 2-190
Sh 2-191
Sh 2-192
Sh 2-193
Sh 2-194
Sh 2-195
Sh 2-196
Sh 2-197
Sh 2-198
Sh 2-199
Sh 2-201
Sh 2-202
Sh 2-203
Sh 2-204
Sh 2-205
Sh 2-206
Sh 2-207
Sh 2-208
Sh 2-209
Sh 2-210
Sh 2-211
Sh 2-212
Sh 2-213
Sh 2-214
Sh 2-215
Sh 2-216
Sh 2-217
Sh 2-218
Sh 2-219
Sh 2-220
Sh 2-221
Sh 2-222
Sh 2-223
Sh 2-224
Sh 2-225
Sh 2-226
Sh 2-227
Sh 2-228
Sh 2-229
Sh 2-230
Sh 2-231
Sh 2-232
Sh 2-233
Sh 2-234
Sh 2-235
Sh 2-236
Sh 2-237
Sh 2-238
Sh 2-239
Sh 2-240
Sh 2-241
Sh 2-242
Sh 2-243
Sh 2-244
Sh 2-245
Sh 2-246
Sh 2-247
Sh 2-248
Sh 2-249
Sh 2-250
Sh 2-251
Sh 2-252
Sh 2-253
Sh 2-254
Sh 2-255
Sh 2-256
Sh 2-257
Sh 2-258
Sh 2-259
Sh 2-260
Sh 2-261
Sh 2-262
Sh 2-263
Sh 2-264
Sh 2-265
Sh 2-266
Sh 2-267
Sh 2-268
Sh 2-269
Sh 2-270
Sh 2-271
Sh 2-272
Sh 2-273
Sh 2-274
Sh 2-275
Sh 2-276
Sh 2-277
Sh 2-278
Sh 2-279
Sh 2-280
Sh 2-281
Sh 2-282
Sh 2-283
Sh 2-284
Sh 2-285
Sh 2-286
Sh 2-287
Sh 2-288
Sh 2-289
Sh 2-290
Sh 2-291
Sh 2-292
Sh 2-293
Sh 2-294
Sh 2-295
Sh 2-296
Sh 2-297
Sh 2-298
Sh 2-299
Sh 2-301
Sh 2-302
Sh 2-303
Sh 2-304
Sh 2-305
Sh 2-306
Sh 2-307
Sh 2-308
Sh 2-309
Sh 2-310
Sh 2-311
Sh 2-312
Sh 2-313

Constellation of Scorpius

Stars

Bayer	α (Antares) β (Acrab) δ (Dschubba) ε (Larawag) ζ¹ ζ² η θ (Sargas) ι¹ ι² κ(Girtab) λ (Shaula) μ¹ (Xamidimura) μ² (Pipirima) ν (Jabbah) ξ ο π (Fang) ρ (Iklil) σ (Alniyat) τ (Paikauhale) υ (Lesath) χ ψ ω¹ ω² G (Fuyue) H (β Nor) N (α Nor) Q
Flamsteed	1 (b) 2 (A) 4 11 12 (c¹) 13 (c²) 16 18 22 (i) 25 27
Variable	T U AH AK AR BM V636 V728 V861 V884 V905 V913 V915 V918 V919 V921 V957 V973 V1033 V1036 V1040 V1073 (k) V1094 V1104 V1280 V1309
HR	5910 5969 6003 6017 6070 (d) 6094 6272 6298 (Shengong) 6628 6675 6682
HD	144941 145377 149274 150248 153950 (Rapeto) 155448 159868 162020
Other	Gliese 667 Gliese 682 EPIC 204278916 EPIC 204376071 GCRT J1745−3009 HIP 79431 (Sharjah) IGR J17091-3624 IRAS 17163−3907 K2-24 K2-33 LSS 4067 MOA-2008-BLG-310L OAO 1657-415 OGLE-2005-BLG-071L OGLE-2005-BLG-390L OGLE-2006-BLG-109L Oph 162225-240515 Pismis 24-1 PSR B1620−26 PSR J1614−2230 ROXs 12 1RXS J160929.1−210524 Scorpius X-1 Trumpler 27-1 UScoCTIO 108 VVV-WIT-07 WASP-17 (Dìwö) WR 86 WR 93b Wray 17-96

Exoplanets	HD 145377 b HD 153950 b (Trimobe) HD 159868 b HIP 78530 b HIP 79431 b (Barajeel) K2-24b c K2-33b K2-38b OGLE-2005-BLG-071Lb OGLE-2005-BLG-390Lb OGLE-2007-BLG-368Lb PSR B1620−26 b WASP-17b (Ditsö̀) V921 Scorpii b

Star
clusters

NGC	6124 6139 6144 6231 6242 6256 6281 6380 6388 6400 6441 6453 6480 6496
Other	Messier 4 Messier 6 Messier 7 Messier 80 Trumpler 27

Nebulae

NGC	6072 6153 6302 6334 6337 6357
Other	Sh 2-1 Sh 2-4 Sh 2-5 Sh 2-10 Sh 2-13 Sh 2-23

Galaxies

NGC	6000
Other	PKS 1622−297 TXS 1545−234