The following list is a very small subset of the results of a search for asteroid-deepsky appulses for 2020, presenting only the highlights for the year based on close approaches of brighter asteroids to brighter DSOs. For the complete set visit http://www.minorplanet.info/ObsGuides/Appulses/DSOAppulses.htm
For any event not covered, the Minor Planet Center’s web site at https://www.minorplanetcenter.net/cgi-bin/checkmp.cgi allows you to enter the location of a suspected asteroid or supernova and check if there are any known targets in the area.
The table gives the following data:
| Date/Time | Universal Date (MM DD) and Time of closest approach |
| #/Name | The number and name of the asteroid |
| RA/Dec | The J2000 position of the asteroid |
| AM | The approximate visual magnitude of the asteroid |
| Sep/PA | The separation in arcseconds and the position angle from the DSO to the asteroid |
| DSO | The DSO name or catalog designation |
| DM | The approximate total magnitude of the DSO |
| DT | DSO Type: OC = Open Cluster; GC = Globular Cluster; G = Galaxy |
| SE/ME | The elongation in degrees from the sun and moon, respectively |
| MP | The phase of the moon: 0 = New, 1.0 = Full. Positive = waxing; Negative = waning |
| Date | UT | # | Name | RA | Dec | AM | Sep | PA | DSO | DM | DT | SE | ME | MP | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 01 | 24 | 06:59 | 238 | Hypatia | 06:34.80 | + 05 | 17.1 | 12.5 | 398 | 207 | NGC 2252 | 7.7 | OC | 150 | 154 | 0.00 |
| 01 | 25 | 21:41 | 83 | Beatrix | 09:05.63 | + 25 | 23.0 | 11.6 | 190 | 198 | NGC 2750 | 11.9 | G | 170 | 173 | 0.01 |
| 02 | 18 | 11:32 | 124 | Alkeste | 11:32.69 | + 00 | 56.2 | 11.9 | 560 | 28 | NGC 3720 | 12.9 | G | 156 | 97 | -0.24 |
| 02 | 18 | 19:16 | 124 | Alkeste | 11:32.50 | + 00 | 57.8 | 11.9 | 591 | 27 | NGC 3719 | 13.0 | G | 156 | 101 | -0.21 |
| 02 | 19 | 17:45 | 241 | Germania | 10:14.24 | + 03 | 30.1 | 12.3 | 130 | 18 | NGC 3169 | 10.2 | G | 172 | 132 | -0.14 |
| 02 | 20 | 03:38 | 241 | Germania | 10:13.91 | + 03 | 31.6 | 12.3 | 351 | 17 | NGC 3166 | 10.4 | G | 172 | 137 | -0.11 |
| 02 | 25 | 07:45 | 71 | Niobe | 12:05.66 | −27 | 54.2 | 10.8 | 154 | 315 | IC 2995 | 12.2 | G | 136 | 145 | 0.03 |
| 03 | 16 | 16:37 | 511 | Davida | 07:25.65 | + 29 | 26.2 | 11.0 | 173 | 167 | NGC 2371 | 13.0 | PN | 112 | 160 | −0.47 |
| 03 | 16 | 16:37 | 511 | Davida | 07:25.65 | + 29 | 26.2 | 11.0 | 173 | 167 | NGC 2372 | 13.0 | PN | 112 | 160 | −0.47 |
| 03 | 18 | 13:52 | 99 | Dike | 12:22.61 | + 15 | 34.2 | 12.5 | 73 | 8 | NGC 4312 | 11.7 | G | 164 | 115 | −0.28 |
| 03 | 21 | 17:04 | 674 | Rachele | 11:33.18 | + 24 | 19.3 | 11.3 | 460 | 182 | NGC 3728 | 13.0 | G | 154 | 161 | −0.06 |
| 03 | 23 | 13:34 | 89 | Julia | 13:28.97 | −33 | 00.6 | 11.3 | 573 | 350 | NGC 5161 | 11.2 | G | 143 | 133 | −0.01 |
| 03 | 29 | 13:02 | 485 | Genua | 10:42.10 | + 00 | 24.5 | 11.9 | 205 | 243 | NGC 3340 | 13.0 | G | 152 | 96 | 0.23 |
| 04 | 15 | 03:53 | 38 | Leda | 13:13.17 | −19 | 35.4 | 12.1 | 287 | 204 | NGC 5022 | 12.9 | G | 169 | 93 | −0.48 |
| 04 | 15 | 13:18 | 38 | Leda | 13:12.83 | −19 | 33.2 | 12.1 | 148 | 204 | NGC 5018 | 10.8 | G | 169 | 98 | −0.44 |
| 04 | 16 | 02:08 | 704 | Interamnia | 11:07.42 | −19 | 26.4 | 11.6 | 139 | 46 | NGC 3528 | 13.0 | G | 143 | 128 | −0.39 |
| 04 | 16 | 06:08 | 5 | Astraea | 08:19.48 | + 20 | 39.7 | 10.9 | 584 | 7 | NGC 2558 | 12.9 | G | 96 | 170 | −0.37 |
| 04 | 16 | 06:26 | 6 | Hebe | 13:12.80 | + 12 | 42.6 | 10.0 | 436 | 24 | NGC 5020 | 11.7 | G | 156 | 120 | −0.37 |
| 04 | 20 | 13:01 | 5 | Astraea | 08:25.38 | + 20 | 28.5 | 11.0 | 512 | 8 | NGC 2582 | 13.0 | G | 93 | 121 | −0.06 |
| 04 | 24 | 05:28 | 92 | Undina | 14:22.50 | + 00 | 18.8 | 11.5 | 325 | 16 | NGC 5584 | 11.4 | G | 167 | 164 | 0.01 |
| 04 | 25 | 01:23 | 52768 | 1998 OR2 | 09:42.43 | + 00 | 23.1 | 11.5 | 349 | 57 | NGC 2967 | 11.6 | G | 112 | 90 | 0.04 |
| 04 | 25 | 07:27 | 674 | Rachele | 11:14.06 | + 22 | 08.4 | 12.0 | 476 | 102 | UGC 6253 | 12. 0 | G | 124 | 101 | 0.05 |
| 04 | 27 | 16:42 | 129 | Antigone | 19:42.69 | −10 | 16.6 | 11.2 | 25 | 348 | NGC 6814 | 11.2 | G | 102 | 152 | 0.19 |
| 04 | 29 | 17:06 | 261 | Prymno | 15:21.49 | −13 | 13.0 | 12.1 | 487 | 191 | NGC 5915 | 12.3 | G | 167 | 116 | 0.38 |
| 04 | 30 | 01:20 | 52768 | 1998 OR2 | 10:55.40 | −26 | 04.0 | 10.8 | 300 | 53 | NGC 3463 | 12.9 | G | 129 | 63 | 0.42 |
| 05 | 22 | 12:55 | 404 | Arsinoe | 14:40.91 | + 03 | 25.7 | 11.7 | 167 | 144 | NGC 5718 | 12.9 | G | 150 | 153 | 0.00 |
| 06 | 13 | 16:32 | 6 | Hebe | 12:51.43 | + 12 | 00.4 | 10.9 | 574 | 241 | NGC 4746 | 12.6 | G | 104 | 166 | -0.46 |
| 06 | 17 | 11:25 | 349 | Dembowska | 14:45.00 | -21 | 02.0 | 10.7 | 486 | 190 | NGC 5743 | 13.0 | G | 139 | 171 | -0.14 |
| 06 | 20 | 08:29 | 6 | Hebe | 12:53.41 | + 11 | 19.3 | 11.0 | 485 | 49 | NGC 4762 | 10.3 | G | 98 | 109 | -0.01 |
| 07 | 18 | 16:04 | 126 | Velleda | 20:24.95 | -24 | 40.9 | 11.9 | 445 | 344 | NGC 6907 | 11.2 | G | 172 | 148 | -0.05 |
| 07 | 20 | 13:15 | 753 | Tiflis | 22:02.75 | -32 | 05.8 | 12.4 | 413 | 123 | NGC 7173 | 12.0 | G | 150 | 150 | 0.00 |
| 07 | 22 | 09:59 | 751 | Faina | 21:55.90 | -34 | 52.7 | 12.1 | 433 | 121 | NGC 7154 | 12.4 | G | 152 | 163 | 0.04 |
| 08 | 18 | 17:49 | 737 | Arequipa | 23:53.50 | + 07 | 59.5 | 11.4 | 368 | 285 | NGC 7782 | 12.2 | G | 144 | 138 | 0.00 |
| 08 | 19 | 15:41 | 737 | Arequipa | 23:53.33 | + 07 | 52.3 | 11.4 | 62 | 284 | NGC 777 9 | 12.7 | G | 144 | 150 | 0.01 |
| 08 | 19 | 16:45 | 737 | Arequipa | 23:53.33 | + 07 | 51.9 | 11.4 | 24 | 105 | NGC 7778 | 12.7 | G | 145 | 151 | 0.01 |
| 09 | 11 | 07:02 | 102 | Miriam | 01:24.05 | + 12 | 55.4 | 11.9 | 56 | 128 | NGC 514 | 11.6 | G | 144 | 65 | -0.41 |
| 09 | 18 | 09:53 | 7 | Iris | 18:05.20 | -19 | 43.4 | 10.2 | 456 | 0 | NGC 6537 | 12.0 | PN | 96 | 82 | 0.02 |
| 09 | 21 | 18:53 | 185 | Eunike | 18:39.85 | −08 | 28.3 | 12.5 | 56 | 46 | Tr 34 | 8.6 | OC | 101 | 42 | 0.26 |
| 09 | 23 | 18:41 | 1 | Ceres | 22:32.16 | −25 | 18.1 | 8.0 | 293 | 354 | NGC 7294 | 12.5 | G | 146 | 64 | 0.47 |
| 10 | 15 | 05:54 | 471 | Papagena | 02:40.96 | −07 | 06.3 | 9.5 | 498 | 174 | NGC 1051 | 13.0 | G | 155 | 142 | −0.04 |
| 10 | 21 | 14:48 | 471 | Papagena | 02:35.60 | −07 | 11.0 | 9.5 | 183 | 180 | NGC 991 | 11.7 | G | 158 | 117 | 0.30 |
| 11 | 08 | 18:44 | 471 | Papagena | 02:18.72 | −06 | 29.7 | 9.5 | 335 | 19 | NGC 881 | 12.4 | G | 155 | 110 | −0.48 |
| 11 | 10 | 16:35 | 194 | Prokne | 01:49.06 | −15 | 03.0 | 11.1 | 245 | 168 | NGC 682 | 13.0 | G | 143 | 142 | −0.27 |
| 11 | 15 | 23:10 | 196 | Philomela | 08:22.90 | + 24 | 14.3 | 12.1 | 181 | 152 | NGC 2575 | 12.7 | G | 111 | 122 | 0.01 |
| 12 | 09 | 14:31 | 163 | Erigone | 06:08.39 | + 14 | 03.1 | 11.5 | 367 | 359 | NGC 2169 | 5.9 | OC | 163 | 97 | −0.32 |
| 12 | 12 | 10:14 | 29 | Amphitrite | 10:48.02 | +12 | 43.0 | 10.5 | 517 | 22 | M105 | 9.3 | G | 102 | 71 | −0.07 |
| 12 | 12 | 23:44 | 29 | Amphitrite | 10:48.38 | + 12 | 41.1 | 10.5 | 196 | 20 | NGC 3384 | 9.9 | G | 102 | 79 | −0.04 |
| 12 | 13 | 12:22 | 29 | Amphitrite | 10:48.69 | + 12 | 39.3 | 10.4 | 467 | 21 | NGC 3389 | 11.9 | G | 103 | 87 | −0.02 |