TW Piscis Austrini

Starbox begin
name= [http://cdsweb.u-strasbg.fr/cgi-bin/bibobj?2005A%26A...444..573D&HD+216803 TW Piscis Austrini] Starbox observe
epoch=J2000
ra=22^h 56^m 24.1^s
dec=-31° 33′ 56″
appmag_v=6.48
constell=Piscis Austrinus Starbox character
class=K4-5 Ve
b-v=1.10
u-b=1.02
variable=BY Draconis Starbox astrometry
radial_v=+6
prop_mo_ra=330.53
prop_mo_dec=-159.85
parallax=130.94
p_error=0.92
absmag_v=7.07 Starbox detail
mass=0.81
radius=0.76-0.85
luminosity=0.12
temperature=?
metal=?
rotation=?
age=2 × 10⁸ Starbox catalog
names=TW PsA, Gl 879, HR 8721, CD -32°17321, HD 216803, LTT 9283, GCTP 5562.00, SAO 214197, CP(D)-32 6550, HIP 113283.

TW Piscis Austrini is a dwarf star in the constellation Piscis Austrinus. It lies relatively close to the Sun, at an estimated distance of 24.9 light years.

The TW in the name is astronomical nomenclature for a variable star. This is a flare star of the type known as a BY Draconis variable. It varies slightly in apparent magnitude, ranging from 6.44 to 6.49 over a ten day period. While smaller than the Sun, it is relatively large for a flare star. Most flare stars are red M-type dwarfs.

TW Piscis Austrini lies within a light year of the much-brighter star Fomalhaut, and the two may be travelling companions that share a common motion through space.

External links

* [http://www.ari.uni-heidelberg.de/aricns/cnspages/4c01875.htm ARICNS entry]
* [http://www.solstation.com/stars/tw-psa.htm TW Piscis Austrini] at SolStation.
* [http://www.alcyone.de/SIT/BYDra/SIT003196.htm Alcyone ephemeris]