NGC 3665 — S0 in Ursa Major
S0 in Ursa Major, 4.1 arcminutes across, its light 96 million years old. Measured by HyperLEDA, photographed by Pan-STARRS1. Recorded once.
About NGC 3665
What you are looking at
NGC 3665 is a lenticular galaxy: a disc galaxy that has largely used up the gas it needs to form new stars, so its disc is smooth and has no spiral arms. It is tilted about 50° to our line of sight, enough to show both the shape of its arms and the depth of its disc. From edge to edge its visible disc spans about 112,000 light-years, close to the width of the Milky Way.
What astronomers have recorded
SIMBAD, the reference database astronomers use, classes it as a member of a group of galaxies. One supernova has been recorded in it: SN 2002hl. It is cited in 369 scientific papers indexed by SIMBAD, and recorded there under 34 different catalogue designations.
When this light set out
The light that reaches us from NGC 3665 today set out about 96 million years ago, when dinosaurs were at their peak. The galaxy is moving away from us at about 1,991 km/s (4.5 million mph), carried by the expansion of the universe.
Finding it in the sky
NGC 3665 lies in Ursa Major. It is best placed on spring evenings: around 9:30 pm in April it stands about 89° high in the south, seen from the middle of the United States.
Its neighbours
At almost the same distance from us, and so its neighbours in space as well as on the sky: NGC 3658 (0.2° away on the sky, at least 410,000 light-years from it); UGC 6416 (0.5° away on the sky, at least 810,000 light-years from it); UGC 6433 (0.7° away on the sky, at least 1,200,000 light-years from it); NGC 3652 (1.1° away on the sky, at least 1,790,000 light-years from it), and 3 more.
By apparent size it is number 234 of the 12,657 galaxies on the Galaxy Origins register.
Measurements
| Catalogue | PGC 35064 |
|---|---|
| Morphological type | S0 |
| Angular diameter | 4.05′ |
| Right ascension | 11h24m43.7s |
| Declination | +38°45′46.0″ |
| Constellation | Ursa Major |
| Inclination | 50.3° |
| Light travel time | 96 million years |
| Bar | not recorded |
Check every figure above in the NASA/IPAC Extragalactic Database
What is sold
A print of this galaxy and the record of the calculation, once. When it sells it leaves the register and is not offered again. We assign no names and no ownership — nobody can sell you those.
At 4.1 arcminutes this is a Exceptional galaxy, which is the tier where a real photograph shows clear structure and dust lanes. The tier comes from the measured diameter, not from a price list.
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