EE Pegasi

Ablue bandlight curve for EE Pegasi, plotted from data published by Ebbighausen (1971)[1]
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Pegasus
Right ascension	21h 40m 01.87850s[2]
Declination	+09° 11′ 05.1169″[2]
Apparent magnitude (V)	6.96[3](7.09 + 9.40)[4]
Characteristics
A
Spectral type	A3m[4]
B−Vcolor index	0.120±0.018[3]
B
Spectral type	F5V[4]
B−Vcolor index	0.44±0.05[4]
Astrometry
Radial velocity (Rv)	−22.6[5] km/s
Proper motion (μ)	RA: +41.237[2]mas/yr Dec.: +13.723[2]mas/yr
Parallax (π)	6.9143±0.0658 mas[2]
Distance	472 ± 4 ly (145 ± 1 pc)
Absolute magnitude (MV)	0.50[3]
Orbit[4]
Primary	AB
Companion	C
Period (P)	2,628 d
Eccentricity (e)	0.52±0.11
Inclination (i)	88.6[5]°
Periastronepoch (T)	2,443,120±24 JD
Argument of periastron (ω) (secondary)	−85±11°
Semi-amplitude (K1) (primary)	4.4±0.6 km/s
Details[4]
A
Mass	2.15±0.02 M☉
Radius	2.09±0.03 R☉
Luminosity	53.42[3] L☉
Surface gravity (log g)	4.13±0.01 cgs
Rotational velocity (v sin i)	40.0±1.0[6] km/s
Age	300 Myr
B
Mass	1.33±0.01 M☉
Radius	1.31±0.01 R☉
Surface gravity (log g)	4.33±0.01 cgs
Rotational velocity (v sin i)	26.0±2.0[6] km/s
Other designations
EE Peg,BD+08°4714,HD 206155,HIP 106981,SAO 126971[7]
Database references
SIMBAD	data

EE Pegasi is avariabletriple star system in the northernconstellationPegasus. It is too faint to be readily visible to the naked eye with a combinedapparent visual magnitude of 6.96.^[3] The system is located at a distance of approximately 472 light years from theSun based onParallax,^[2] but is drifting closer with aradial velocity of −23 km/s.^[5]

This system was found to be aneclipsing binary by German astronomerCuno Hoffmeister in 1935, and has since been the subject of multiple studies. The pair orbit each other closely with aperiod of 2.628 days.^[1][8] The magnitude 7.09 primary, component A, is anAm star with astellar classification of A3m. It has more than double the mass and radius of the Sun. The secondary companion, component B, is anF-type main-sequence star with a class of F5V and a visual magnitude of 9.40. A third component is a smaller orange orred dwarf that orbits the main pair every 4.01 years.^[4]

• A-type giants
• F-type main-sequence stars
• Triple star systems
• Algol variables
• Pegasus (constellation)
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Objects with variable star designations

• Articles with short description
• Short description matches Wikidata