NGC 4725 (One-Armed Spiral)

Telescope: Planewave 17" CDK reflector, 1940 mm FL
Camera: FLI-PL6303E, 3072 x 2048 pixels
Exposure: 8 x 3 minutes. Seeing 1.7" FWHM. Processed with PixInsight and Photoshop.
Location: Mayhill, New Mexico (Elevation 7380')
Image Center (J2000): RA 12h 50m 08s, Dec 25° 30' 11"

An intermediate barred spiral galaxy in Coma Berenices. An odd one-armed spiral galaxy with a sharply brighter nucleus. Its many H-II regions trace the spiral arm. The central bar, its unusual prominent ring and faint filaments nears its nucleus can all be seen in this image with limiting magnitude about 22. The smaller galaxy NGC 4712, 12' east, is more distant and gravitationally unrelated.
Raw data for this image can be downloaded.


NGC 4725 (One-Armed Spiral), An intermediate barred spiral galaxy in Coma Berenices. An odd one-armed spiral galaxy with a sharply brighter nucleus. Its many H-II regions trace the spiral arm. The central bar, its unusual prominent ring and faint filaments nears its nucleus can all be seen in this image with limiting magnitude about 22. The smaller galaxy NGC 4712, 12' east, is more distant and gravitationally unrelated.
, acquired with a remote telescope at Mayhill, New Mexico (Elevation 7380')

Object Label Identifier Notes
Galaxy G1 2MASX J12494247+2529032 m=18.1g
Galaxy G10 2MASX J12501080+2532575 m=17.5g
Galaxy G11 NGP9 F378-0075727 North Galactic Pole, 9 plate pairs, m=18.4
Galaxy G11 21.7g SDSS J124931.49+252632.6 m=21.7g
Galaxy G12 SDSS J125018.28+253146.3 mG=19.0
Galaxy G13 SDSS J124935.23+253105.9 m=19.6, Extended source
Galaxy G14 SDSS J124932.32+253110.1 mV=20.0
Galaxy G2 2MASX J12501710+2523376 m=17.6g
Galaxy G3 2MASX J12502359+2524076 m=17.2g
Galaxy G4 SDSS J124957.73+253349.9 m=19.39
Galaxy G5 2MASX J12504118+2538256 m=16.7g
Galaxy G6 SDSS J125035.47+252353.4 mV=20.3
Galaxy G8 SDSS J125033.75+252432.7
HII Region HII Regions 9 are marked.
Quasar Q1 SDSS J124941.89+252838.9 z=1.91, mG=19.3
Quasar Q2 z=2.27 SDSS J124945.63+253848.8 z=2.2797, mG=19.0

Click on the image to display the plate solved image with annotations. 4' across NGC 4725 is about 45,000 light years.


NGC 4725 with Makemake

NGC 4725 with Makemake

The arrowed object at bottom left is dwarf planet Makemake at 17th magnitude and about 52 AUís from Earth, outside of the orbit of Pluto. From the same image as above but cropped differently and a coordinate grid added. The image covers about 28' x 25'. The JPL HORIZONS site lists Makemakeís ephemeris as:

2016-May-28 00:00, RA=12 51 24.88, DEC=+25 50 07.2, apparent mag=17.04

Top left is galaxy KUG 1247+260, a companion galaxy at 16th mag.