NGC 7457 — E-S0 in Pegasus
E-S0 in Pegasus, 4.0 arcminutes across, its light 39 million years old. Measured by HyperLEDA, photographed by Pan-STARRS1. Recorded once.
About NGC 7457
What you are looking at
NGC 7457 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. From edge to edge its visible disc spans about 45,000 light-years (taking its redshift distance, which for a galaxy this near is approximate), about half the width of the Milky Way.
What astronomers have recorded
It is cited in 461 scientific papers indexed by SIMBAD, and recorded there under 12 different catalogue designations.
When this light set out
Its light has been travelling for about 39 million years. When it left, the planet had come through its hottest interval since the dinosaurs. The galaxy is moving away from us at about 813 km/s (1.8 million mph), carried by the expansion of the universe. For a galaxy this close, its own motion through space is a large share of that speed, so the distance worked out from it is approximate; distances measured from individual stars in it can differ.
Finding it in the sky
NGC 7457 lies in Pegasus. It is best placed on autumn evenings: around 9:30 pm in October it stands about 80° 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: UGC 12311 (0.1° away on the sky, at least 90,000 light-years from it); IC 1473 (2.2° away on the sky, at least 1,530,000 light-years from it); UGC 12212 (2.5° away on the sky, at least 1,700,000 light-years from it).
By apparent size it is number 248 of the 12,657 galaxies on the Galaxy Origins register.
Measurements
| Catalogue | PGC 70258 |
|---|---|
| Morphological type | E-S0 |
| Angular diameter | 3.95′ |
| Right ascension | 23h00m59.9s |
| Declination | +30°08′41.6″ |
| Constellation | Pegasus |
| Inclination | 73.4° |
| Light travel time | 39 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 4.0 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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