Q157804

Picture of the Day · NASA

NGC 3660 and Burçin's Galaxy

2026-05-26

The upper galaxy might be more photogenic, but the lower galaxy is more unusual. The galaxy up top is NGC 3660, a spiral galaxy similar to our own Milky Way galaxy in that it has several bright blue spiral arms and a central bar of stars, dust, and gas. Captured by chance in the featured deep and colorful image, surprisingly, is SN 2026cff, a supernova found just to the right of the central bar. Farther in the distance is the bottom galaxy, known informally as Burçin’s galaxy, but formally cataloged as LEDA 1000714. The center of this galaxy appears to be an old elliptical galaxy, but it is strangely surrounded by not one but two rings of stars. What created Burçin's galaxy is a mystery and remains a continuing topic of research, but it likely involves the accretion of one or more smaller galaxies.

via NASA APOD

Key facts

Discovered by

A. Schwassmann

Discovery site

Bergedorf

Discovery date

30 October 1918

Alternative designations

1918 ET

Observation arc

100.01 yr (36529 days)

Aphelion

3.1427 AU (470.14 Gm )

Perihelion

2.6457 AU (395.79 Gm)

Semi major axis

2.8942 AU (432.97 Gm)

Orbital period sidereal

4.92 yr (1798.4 d )

Mean anomaly

0.00772276 °

Mean motion

0° 12 0.648 / day

Inclination

11.783°

Longitude of ascending node

40.209°

Wikidata facts

Instance of

asteroid

Named after

Johann Georg Repsold

Followed by

Q157807

Follows

Q157788

Parent body

Sun

Minor-planet group

asteroid belt

Diameter

+65.752

Orbital period

+1799.050108832157

Image

906 Repsolda orbit on 01 Jan 2009.png