NGC/IC Project Restoration Effort

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NGC1109

 

Basic Information


Location and Magnitude


Right Ascension: 2:47:43.5
Declination: +13:15:20
Constellation: ARI
Visual Magnitude: 14.4

Historic Information


Discoverer: Marth
Year of discovery: 1863
Discovery aperture: 48.0

Observational


Summary description: vF
Sub-type: C

Corwin's Notes

===== NGC 1109 (= IC 1846?), 1111, 1112, 1113, 1115, 1116, 1117, and 1127. Of these eight nebulae, all found on a single night in 1863 by Albert Marth with William Lassell's 48-inch reflector, only three -- N1115, 16, and 27 -- can be readily identified. All but one of the others can be force-fit to galaxies in area, but only by changing RA differences from galaxy to galaxy. The declinations are pretty good, assuming that the RA differences noted below are in fact leading us to the correct objects. All we have here to help decypher the field are Marth's positions -- five of them clearly wrong -- and descriptions -- all of them sparce. Here are my tentative conclusions, with Marth's data on the first line (my comments follow in parentheses), and the modern positions (for J2000.0) on the second: NGC RA (2000.0) Dec Description and comments 1109 02 49 39 +13 15.1 vF (Marth's RA 2.0 min off?) 02 47 43.6 +13 15 19 = IC 1846 = UGC 2265 = CGCG 440-008 1111 02 49 43 +13 14.0 F, vS, stell (Marth's RA 1.0 min off?) 02 48 39.4 +13 15 34 = IC 1850. Faint comp 0.4 arcmin s. 1112 02 50 00 +13 13.0 F, pS (Marth's RA 1.0 min off?) 02 49 00.4 +13 13 26 = IC 1852 = UGC 2293 = CGCG 440-015 1113 02 50 08 +13 18.0 vF (Marth's position on * 10). 02 50 05.1 +13 19 39 = * 15. 1115 02 50 25 +13 15.0 vF 02 50 25.4 +13 15 58 = CGCG 440-020 1116 02 50 35 +13 19.9 vF 02 50 35.7 +13 20 06 = UGC 2326 = CGCG 440-021 1117 02 50 43 +13 09.9 Close to a small * (RA 30 sec off? Is the comp 0.4 arcmin n the "small *"?) This may also be = IC 1855 (which see). 02 51 13.1 +13 11 07 = CGCG 440-022s = UGC 2337s 1127 02 52 51 +13 14.6 vF 02 52 51.9 +13 15 23 = CGCG 440-024 = UGC 2356 As I implied, the RA differences strike me as rather ad hoc if I have the correct objects, so these are tentative conclusions. Javelle went over this field in January 1896; there is at least one problem with his observations, too, perhaps more. See IC 1855 for that story.

Steve's Notes

===== NGC 1109 17.5" (1/9/99): faint, small, round, 25" diameter, weak concentration, very faint stellar nucleus with direct vision. Situated 2.5' ENE of a mag 11.5 star. The NGC identification of this galaxy is very uncertain due to poor positions in the group by Marth and UGC, MCG and CGCG identify this galaxy as IC 1846.