BL Lacertae
Also known as BL Lac
BL Lacertae is a BL Lac in the constellation Lacerta.
Prototype of the blazars
Facts
| Type | BL Lac |
|---|---|
| Constellation | Lacerta |
| Position (J2000) | 22h 02m 43s, +42° 16′ |
| Brightness | magnitude 14.72 (smaller is brighter; the faintest stars the eye sees are about 6) |
| Size on the sky | 0′ (the full Moon is about 31′) |
| Redshift | z = 0.0655 |
| Studied in | 2,426 scientific papers (SIMBAD) |
When and how to see it
BL Lacertae is highest in the sky at midnight in August. From India (about 20° N) it climbs to about 68° above the horizon; from 50° N, to about 82°. To see it you need a large telescope or long-exposure photos.
Heights are worked out for India and for 50° N. Set your location in Settings to see them for where you are.
For tonight's best time from your own town, the darkness and the Moon, open it on the map and see its "Tonight from your location" card.
Data: SIMBAD (CDS, Strasbourg; the site's weekly copy) · Data sources & credits