Eta Aquilae

Starbox begin
name=η Aquilae Starbox image


caption = η Aquilae Starbox observe
epoch=J2000
ra=19^h 52^m 28.3679^s
dec= +01° 00′ 20.378″
appmag_v=3.88
constell=Aquila Starbox character
class=F6Iab
r-i = 0.47
v-r =
b-v = 0.89
u-b = 0.51
variable=Cepheid variable Starbox astrometry
radial_v=-14.8
prop_mo_ra=6.94
prop_mo_dec= -7.3
parallax=2.78
p_error=0.91
absmag_v=-3.90 Starbox detail
mass=7
radius=60
luminosity=3,400 | temperature=5,300–6,200
metal=?
rotation=0,01964857221 Year
age=?

Starbox catalog
names=Bazak, 55 Aquilae, HR 7570,
HD 187929, BD+00°4337,
FK5 746, HIP 97804,
SAO 125159, GC 27517, UBV 21297. Starbox reference
Simbad=HD+187929
ARICNS =

Eta Aquilae (η Aql / η Aquilae) is a star in the constellation Aquila. It was also part of the former constellation Antinous. In addition, this star carries the seldom used Hebrew name Bezek or "Bazak", meaning "lightning".

It is a Cepheid variable star, varying from apparent magnitude 3.6 to 4.4 with a period of 7.176641 days. Along with Delta Cephei, Zeta Geminorum and Beta Doradus, it is one of the most prominent naked eye Cepheids; that is, both the star itself and the variation in its brightness can be distinguished by the naked eye. Some other Cepheids such as Polaris are bright but have only a very small variation in brightness.

It is about 1200 light years from Earth. It is a yellow-white supergiant, and is about 3000 times more luminous than the Sun, with a diameter about 60 times that of the Sun.

Location

The star's location in the constellation of Aquila is shown in the following

References

*

External links

* [http://www.astro.uiuc.edu/~kaler/sow/etaaql.html Eta Aquilae]
* [http://www.alcyone.de/cgi-bin/search.pl?object=HR7570 HR 7570]
* [http://aladin.u-strasbg.fr/AladinPreview?-c=19+52+28.3679%2B01+00+20.378&ident=V*+eta+Aql&submit=Aladin+previewer Image Eta Aquilae]
* [http://www.alcyone.de/SIT/bsc/ Yale Bright Star Catalog; click on Aquila]