NGC 4688 — Sc in Virgo
Sc in Virgo, 3.7 arcminutes across, its light 47 million years old. Measured by HyperLEDA, photographed by Pan-STARRS1. Recorded once.
About NGC 4688
What you are looking at
NGC 4688 is a late-type spiral: a small central bulge and open, loosely wound arms full of young stars and star-forming gas. It faces us almost squarely, which shows its full structure at once. From edge to edge its visible disc spans about 51,000 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
SIMBAD, the reference database astronomers use, classes it as one of a pair of galaxies. One supernova has been recorded in it: SN 1966B. It is cited in 185 scientific papers indexed by SIMBAD, and recorded there under 22 different catalogue designations.
When this light set out
Its light has been travelling for about 47 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 986 km/s (2.2 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
In the sky, NGC 4688 sits within the constellation Virgo. It is best placed on spring evenings: around 9:30 pm in May it stands about 54° 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 4701 (1.0° away on the sky, at least 840,000 light-years from it); NGC 4713 (1.1° away on the sky, at least 920,000 light-years from it); NGC 4630 (1.4° away on the sky, at least 1,130,000 light-years from it); NGC 4765 (1.4° away on the sky, at least 1,130,000 light-years from it), and 13 more.
By apparent size it is number 287 of the 12,657 galaxies on the Galaxy Origins register.
Measurements
| Catalogue | PGC 43189 |
|---|---|
| Morphological type | Sc |
| Angular diameter | 3.72′ |
| Right ascension | 12h47m46.6s |
| Declination | +04°20′12.6″ |
| Constellation | Virgo |
| Inclination | 23.7° |
| Light travel time | 47 million years |
| Bar | yes, from the catalogue |
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 3.7 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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