Hi Orestis & PGC,
Thanks Orestis for posting this selection of varied objects.
Just as an aide on the NGC 1888 (also Arp 123) & NGC 1889 pair of eg, here are some notes that may be of assistance as a guide. NGC 1888 is in the Arp catalogue and (photographically) has a distinctly warped disc probably as a result of interaction with NGC 1889 that has a very similar R.V and therefore presumably a very likely similar distance. It is probably that peculiarity that brought to to Halton Arp's attention.
25cm x86 in 1996 suburban location (NGC 1888 only):
"Mag 19 Size 2.9'. Very LSB patch appearing just slightly off round in PA 30??. Rising only very slightly to centre. A.V very necessary. Lots of scattered mag 11 *s in the field. "L" shaped asterism to the S + another mag 11 * very slightly to centre."
46cm x185 in 2005 rural sky:
x185 27' TF
NGC 1888 & 1889 are in a pair.
NGC 1888 Arp 123 Multi-Galaxy Sys
* RA: 05h 22m 34.5s Dec: -11° 30' 02"
Mag: 12.8 (B) S.B.: 13.1 B-V: +0.92 Size: 3.5'x1.0' Class: SB(s)c pec
P.A.: 149 Inclination: ---R.V.: +2547 Source: RC3 *
NGC 1889 Multi-Galaxy Sys
*RA: 05h 22m 35.5s Dec: -11° 29' 47"
Mag: 14.1 S.B.: --- B-V: --- Size: 0.6'x0.6'Class: E+ pec:
P.A.: 158 Inclination: --- R.V.: +2482Source: RC3 *
NGC 1889 & 1888 are in a close pair. NGC 1888 is the major partner of this pair. It is a nice elongated edge on type spiral, maybe 2' x 10" in PA 150. It shows a pretty easily seen brightening to the axis near centre but no readily apparent core or nucleus. Just N of the nucleus -- just adjacent and appended is NGC 1889 which at first glance could be mistaken for a faint star, but it does have a very small, perhaps 15" diameter halo that rises sharply to the centre where there is a faint *ar nucleus.
And most importantly (Da-da-da daaaa) , well done to Mr PGC (§AB) on his 1000th post (immediately above this post). Excellent contribution !!
Best,
Les D