Equuleus
| Constellation | |
|
|
| Abbreviation | Equ |
|---|---|
| Genitive | Equulei |
| Pronunciation | /ᵻˈkwuːliəs/ Equúleus, genitive /ᵻˈkwuːliaɪ/ |
| Symbolism | the pony |
| Right ascension | 21 |
| Declination | +10 |
| Family | Heavenly Waters |
| Quadrant | NQ4 |
| Area | 72 sq. deg. (87th) |
| Main stars | 3 |
|
Bayer/Flamsteed stars |
10 |
| Stars with planets | 2 |
| Stars brighter than 3.00m | None |
| Stars within 10.00 pc (32.62 ly) | None |
| Brightest star | α Equ (Kitalpha) (3.92m) |
| Nearest star |
HD 200779 (48.41 ly, 14.84 pc) |
| Messier objects | None |
| Meteor showers | None |
| Bordering constellations |
Aquarius Delphinus Pegasus |
|
Visible at latitudes between +90° and −80°. Best visible at 21:00 (9 p.m.) during the month of September. |
|
Equuleus /ᵻˈkwuːliəs/ is a constellation. Its name is Latin for 'little horse', a foal. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is the second smallest of the modern constellations (after Crux), spanning only 72 square degrees. It is also very faint, having no stars brighter than the fourth magnitude.
The brightest star in Equuleus is Alpha Equulei, traditionally called Kitalpha, a yellow star magnitude 3.9, 186 light-years from Earth. Its traditional name means "the section of the horse".
There are few variable stars in Equuleus. Only around 25 are known, most of which are faint. Gamma Equulei is an alpha CVn star, ranging between magnitudes 4.58 and 4.77 over a period of around 12½ minutes. It is a white star 115 light-years from Earth, and has an optical companion of magnitude 6.1, 6 Equulei. It is divisible in binoculars.R Equulei is a Mira variable that ranges between magnitudes 8.0 and 15.7 over nearly 261 days.
Equuleus contains some double stars of interest. γ Equ consists of a primary star with a magnitude around 4.7 (slightly variable) and a secondary star of magnitude 11.6, separated by 2 arcseconds. Epsilon Equulei is a triple star also designated 1 Equulei. The system, 197 light-years away, has a primary of magnitude 5.4 that is itself a binary star; its components are of magnitude 6.0 and 6.3 and have a period of 101 years. The secondary is of magnitude 7.4 and is visible in small telescopes. The components of the primary are becoming closer together and will not be divisible in amateur telescopes beginning in 2015.δ Equ is a binary star with an orbital period of 5.7 years, which at one time was the shortest known orbital period for an optical binary. The two components of the system are never more than 0.35 arcseconds apart.
...
Wikipedia