NGC 5859 and NGC 5857 (UGC 9728 and UGC 9724) Galaxies in Bootes

NGC 5859 is located at: RA 15 hours 07 minutes 34 seconds, Dec +19 degrees 34 minutes 57 seconds

Size: 2.8' x 0.8' and 1.2' x 0.6' Magnitude: 13.3 blue and 13.9 blue Class: SB(s)bc and SB(s)b

North is up

West to the right


 14.5" f5 Newtonian reflector


 ST-8XME, self-guided, binned 1x1, temp -15c & -20c, camera control MaxIm DL 4.56


Lumicon Red filter, 630 minutes (63 x 10 minute subs), 06/19/2021/2017; seeing 2.1-3.9 FWHM per CCDStack

Processing: CCDStack 2.94.6355.18107, Photoshop CS5.1

 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)

Notes: Finished imaging these two on the other side of the meridian ...
Posting this for now, as I may not get back to this duo this season. We are experiencing a lot of early evening fog the past few weeks, and I have moved on to other objects (see NGC 6654) after the moon began to interfere with this field. This field needs way more exposure (I wanted 48 or more subs), as only 60 minutes makes for a noisy image ... NGC 5859 is the larger galaxy.

From the NGC / IC Project:

Steve's Notes


NGC 5857 = UGC 9724 = MCG +03-39-004 = CGCG 106-005 = LGG 394-002 = PGC 53995; 15 07 27.5 +19 35 58; V = 13.1;  Size 1.2'x0.6';  Surf Br = 12.6;  PA = 137d

17.5" (4/4/92): fairly faint, fairly small, elongated 2:1 NW-SE, bright core.  Forms a striking close duo with NGC 5859 2.1' ESE with identical position angles.

WH discovered NGC 5857 = H II-751 = h1905, along with NGC 5859, on 27 Apr 1788 (sweep 834) and recorded "Two, the 1st [NGC 5857] cF, cS.  The 2nd pF, pL, both lE."  The next night he observed the pair again (sweep 835) and noted "both E from np to sf, but nearer the parallel."  JH logged and sketch (fig. 77) "a double nebula; pos of the individuals, centre from centre, 20 np; 2' dist." 

A series of observations were made at Birr Castle of the pair.  On 28 Apr 1848, LdR noted "[I] think the distance between the 2 neb greater than h's drawing."  On 11 Apr 1850 George Stoney remarked "the two nebulae not in a line and a faint connection suspected."  On 17 Apr 1855, R.J. Mitchell recorded "these two nebulae are not in a line, but run parallel to one another in the direction of the major axis, dist between them considerable, but faint neby suspected connecting them. On 9 May 1861, Samuel Hunter commented "bright brightest parts of both are elongated and *not* parallel to each other nor in the same straight line, but as shown [sketch included in the LdR 1861 publication]."


NGC 5859 17.5" (4/4/92): moderately bright and large, very elongated 7:2 NW-SE, brighter along the major axis. Larger and brighter though similar position angle to companion NGC 5857 2.1' WNW.