NGC 4145 — Scd in Canes Venatici
Scd in Canes Venatici, 4.6 arcminutes across, its light 49 million years old. Measured by HyperLEDA, photographed by Pan-STARRS1. Recorded once.
About NGC 4145
What you are looking at
NGC 4145 is a late-type spiral: a small central bulge and open, loosely wound arms full of young stars and star-forming gas. Its disc is steeply tilted, about 64° from face-on, so it appears as a long oval. From edge to edge its visible disc spans about 65,000 light-years (taking its redshift distance, which for a galaxy this near is approximate), about 67% of the Milky Way’s width.
What astronomers have recorded
SIMBAD, the reference database astronomers use, classes it as one of a pair of galaxies. It is cited in 170 scientific papers indexed by SIMBAD, and recorded there under 17 different catalogue designations.
When this light set out
What a telescope records of NGC 4145 is light that left it about 49 million years ago; on Earth, the planet had come through its hottest interval since the dinosaurs. The galaxy is moving away from us at about 1,011 km/s (2.3 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 4145 sits within the constellation Canes Venatici. It is best placed on spring evenings: around 9:30 pm in May it stands about 90° 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 7175 (0.2° away on the sky, at least 180,000 light-years from it); NGC 4151 (0.5° away on the sky, at least 410,000 light-years from it); UGC 7129 (1.9° away on the sky, at least 1,580,000 light-years from it); NGC 4143 (2.7° away on the sky, at least 2,250,000 light-years from it), and 3 more.
By apparent size it is number 155 of the 12,657 galaxies on the Galaxy Origins register.
Measurements
| Catalogue | PGC 38693 |
|---|---|
| Morphological type | Scd |
| Angular diameter | 4.62′ |
| Right ascension | 12h10m01.5s |
| Declination | +39°53′02.1″ |
| Constellation | Canes Venatici |
| Inclination | 64.3° |
| Light travel time | 49 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 4.6 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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