The RASC's Deep Sky Challenge Objects list

Object Descriptions


No. Object Con Type R.A. Dec m_v Size U # min.A
1 NGC 7822 Cep E/RN 00:03.6 +68:37 - 60x30 15 30 2 IC 59 Cas E/RN 00:56.7 +61:04 - 10x5 36 20-25 3 NGC 609 Cas OC 01:37.2 +64:33 11.0 3.0 16 25-30 4 IC 1795 Cas EN 02:24.7 +61:54 - 27x13 17 20 5 Maffei 1 Cas G-E3 02:36.3 +59:39 ~14 5x3 38 30 6 NGC 1049 For GC 02:39.7 -34:29 11.0 0.6 354 25-30 7 NGC 1275 Per G-Pec 03:19.8 +41:31 11.6 2.6x1.9 63 20-25 8 NGC 1432/35 Tau RN 03:46.1 +23:47 30x30 132 10-15 9 IC 342 Cam G-SBc 03:46.8 +68:06 ~12 17x17 18 20-30 10 NGC 1499 Per EN 04:00.7 +36:37 145x40 95 8-12.5 RFT 11 NGC 1554/5 Tau RN 04:21.8 +19:32 var 133 20? 12 IC 405 Aur E/RN 05:16.2 +34:16 30x19 97 20 13 IC 434/B 33 Ori E/DN 05:40.9 -02:28 60x10 226 15-20 dark sky! 14 Sh 2-276 Ori EN 05:48 +01 600x30! 226 10-15 RFT 15 Abell 12 Ori PN 06:02.4 +09:39 ~13 37" 181 25-30 16 IC 443 Gem SNR 06:16.9 +22:47 50x40 137 25-30 17 J 900 Gem PN 06:25.9 +17:47 12.2 8" 137 20 18 IC 2177 Mon E/RN 07:05.1 -10:42 120x40 273 20-30 19 PK 205+14.1 Gem PN 07:29.0 +13:15 ~13 ~700 184 20-25 20 NGC 2419 Lyn GC 07:38.1 +38:53 10.4 4.1 100 15-20 21 PK 164+31.1 Lyn PN 07:57.8 +53:25 ~14 6'40" 43 25 22 Leo I Leo G-E3 10:08.4 +12:18 9.8 10.7x8.3 189 30 23 Abell 1367 Leo G's 11:44.0 +19:57 13-16 ~60 147 30-40 24 NGC 3172 UMi G-? 11:50.2 +89:07 13.6 0.7x0.7 2 25 25 NGC 4236 Dra G-SBb 12:16.7 +69:28 9.6 18.6x6.9 25 20-25 26 Mrk 205 Dra Quasar 12:21.6 +75:18 14.5 stellar 9 30 27 3C 273 Vir Quasar 12:29.1 +02:03 12-13 stellar 238 25-30 28 NGC 4676 Com G's 12:46.2 +30:44 14.1p ~ 2x1 108 25 29 Abell 1656 Com G's 13:00.1 +27:58 12-16 ~60 149 25-30 30 NGC 5053 Com GC 13:16.4 +17:42 9.8 10.5 150 10-20 31 NGC 5897 Lib GC 15:17.4 -21:01 8.6 12.6 334 15-20 32 Abell 2065 CrB G's 15:22.7 +27:43 ~16 ~30 154 50 in superb sky! 33 NGC 6027 Ser G's 15:59.2 +20:45 ~15 ~ 2x1 155 40 34 B 72 Oph DN 17:23.5 -23:38 30 338 8-12.5 RFT 35 NGC 6791 Lyr OC 19:20.7 +37:51 9.5 16 118 20-25 36 PK 64+5.1 Cyg PN 19:34.8 +30:31 9.6 8" 118 20 37 M 1-92 Cyg RN 19:36.3 +29:33 11.0 12"x6" 118 25-30 38 NGC 6822 Sgr G-Irr 19:44.9 -14:48 ~11 10.2x9.5 297 10-15 39 IC 4997 Sge PN 20:20.2 +16:45 10.9 2" 163 20 40 IC 1318 Cyg EN 20:26.2 +40:30 large 84 8-15 RFT 41 PK 80-6.1 Cyg PN? 21:02.3 +36:42 13.5 16" 121 25 42 IC 1396 Cep EN 21:39.1 +57:30 170x140 57 10-12.5 RFT 43 IC 5146 Cyg E/RN 21:53.5 +47:16 12x12 86 20-25 44 NGC 7317-20 Peg G's 22:36.1 +33:57 13-14 ea.~1 123 25-30 45 Jones 1 Peg PN 23:35.9 +30:28 12.1 5'32" 124 25-30

Remarks

  • No. Object Remarks
    1 NGC 7822 large, faint emission nebula; rated `eeF'; also look for E/R nebula Ced 214 (ass. with cluster Berkeley 59) 1 deg S
    2 IC 59 faint emission/reflection nebulosity paired with IC 63 close to gamma Cas; requires clean optics; rated as `pF'
    3 NGC 609 faint patch at low power; high power needed to resolve this rich cluster (also look for Trumpler 1 cluster 1 deg S)
    4 IC 1795 brightest part of a complex nebulosity that includes IC 1805 and IC 1848; use a nebula filter
    5 Maffei 1 heavily reddened galaxy; very faint; requires large aperture and black skies; nearby Maffei II probably invisible
    6 NGC 1049 Class V globular in dward `Fornax system' Local Group galaxy 630,000 ly away, galaxy itself invisible ?
    7 NGC 1275 Perseus A exploding galaxy; brightest member of Abell 426 gal. cl. 300 million ly away; see Webb vol. 5
    8 NGC 1432/35 Pleiades nebulosity (also includes IC 349); brightest around Merope; requires transparent sky and clean optics
    9 IC 342 large and diffuse face-on spiral; member of UMa-Cam cloud (Kemble's Cascade of stars also in this chart)
    10 NGC 1499 California Nebula; very large and faint; use a wide-field telescope or big binoculars plus H-Beat filter
    11 NGC 1554/5 Hind's Variable Nebula; small reflect. neb. around 9m-13m var. star T Tau; use high power; difficulty varies
    12 IC 405 Flaming Star Nebula; associated with runaway star AE Aurigae; see Burnham's Handbook page 285 (also look for IC 410)
    13 IC 434/B 33 B 33 is the Horsehead Nebula, a dark nebula superimposed on a very faint emission nebula IC 434; use H-Beta filter in dark sky!
    14 Sh 2-276 Barnard's Loop; SNR or interstellar bubble?; difficult to detect due to size; use filter and sweep with wide field
    15 Abell 12 also called PK 198 -6.1; faint; not plotted on Uranometria but is on NW edge of mu Orionis; OIII filter required
    16 IC 443 faint supernova remnant very close to eta Gem; use filter (also look for NGC 2174 and Sh 2-247 on this Chart)
    17 J 900 Jonckheere 900; bright starlike planetary; plotted as PK 194 +2.1 in Uranometria; use OIII filter & high power
    18 IC 2177 Eagle Nebula; large, faint; contains bright patches Gum 1 (-10d 28'), NGC 2327 (-11d 18') & Ced 90 (-12d 20')
    19 PK 205+14.1 Medusa Nebula or Abell 21; much larger than plotted in Uranometria; impressive in large aperture with OIII filter
    20 NGC 2419 at 200 000 light years away the most distant Milky Way globular for amateur telescopes; very small & faint; Class II
    21 PK 164+31.1 extremely faint with two small components; use OIII filter; sometimes confused with nearby NGC 2474-75
    22 Leo I dwarf elliptical; satellite of Milky Way; very low surface brightness; 0.3deg N of Regulus!; requires clean optics
    23 Abell 1367 cluster of some 30 or more galaxies within a 1deg field near 93 Leonis; see Webb Handbook Volume 5, page 139
    24 NGC 3172 `Polarissma Borealis' - closest galaxy to the North Celestial Pole; small, faint and otherwise unremarkable
    25 NGC 4236 very large, dim barred spiral; a diffuse glow (NGC 4395 on Chart 108 is a similar large diffuse face-on)
    26 Mrk 205 Markarian 205; a faint star on SW edge of NGC 4319; plotted as a radio source; centre of the red-shift controversy
    27 3C 273 at 2 to 3 billion light years away one of the most distant objects visible in amateur telescopes; magnitude variable
    28 NGC 4676 `The Mice' or VV 224 - two classic interacting galaxies; very faint; double nature detectable at high power
    29 Abell 1656 Coma Berenices galaxy cluster; very rich; 400 million light years away; brightest member NGC 4889; see Webb Volume 5
    30 NGC 5053 faint and very loose globular 1deg SE of M53; requires large aperture to resolve; difficult in hazy skies; Class XI
    31 NGC 5897 large, faint and loose globular; magnitude 10.9 in Atlas Coeli Catalogue; requires large aperture to resolve; Class XI
    32 Abell 2065 Corona Borealis galaxy cluster; perhaps the most difficult object for amateur telescopes; 1.5 billion light years away; requires superb sky!
    33 NGC 6027 Seyfert's Sextet (6027 A-F); compact group of 6 small and very faint galaxies; see Burnham's Handbook page 1793
    34 B 72 Barnard's dark S-Nebula or `The Snake'; opacity of 6/6; 1.5 deg NNE of theta Ophiuchi; area rich in dark nebulas
    35 NGC 6791 large, faint but very rich open cluster with 300 stars; a faint smear in smaller instruments; Type II 3 r
    36 PK 64+5.1 Campbell's Hydrogen Star; very bright but very starlike; also catalogued as star BD +30 3639
    37 M 1-92 Minkowski 92 or Footprint Nebula; bright, starlike reflection nebula; double at high magnification; associated star invisible
    38 NGC 6822 Barnard's Galaxy; member of the Local Group; large but very low surface brightness; requires transparent skies
    39 IC 4997 bright but starlike planetary; the challenge is to see the disk!; blink the field with and without a nebula filter
    40 IC 1318 complex of nebulosity around gamma Cygni; multitude of patches in rich starfield; use a very wide field plus filter
    41 PK 80-6.1 the `Egg Nebula'; a very small proto-planetary nebula; can owners of large telescopes detect polarization?
    42 IC 1396 extremely large and diffuse area of emission nebulosity; use nebula filter and very wide field optics in dark sky
    43 IC 5146 Cocoon Nebula; faint and diffuse; use H-Beta filter; at the end of the long filamentary dark nebula is Barnard 168
    44 NGC 7317-20 Stephan's Quintet; 0.5 deg SSW of NGC 7331; easy to pick out 3 or 4 (also look for `companions' to 7331)
    45 Jones 1 plotted as PK104 -29.1 (from Perek & Kohoutek catalogue) in Uranometria; large dim glow; OIII filter required