HO Telescopii

HO Telescopii

A visual band light curve for HO Telescopii, adapted from Sürgit et al. (2017)[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Telescopium
Right ascension 19h 51m 58.93159s[2]
Declination −46° 51′ 42.4354″[2]
Apparent magnitude (V) 8.22[3] (Max)
Characteristics
Spectral type A7III(m)[4]
Variable type Algol[5]
Astrometry
Radial velocity (Rv)−5.91±0.09[6] km/s
Proper motion (μ) RA: +1.814[2] mas/yr
Dec.: −33.369[2] mas/yr
Parallax (π)3.5831 ± 0.0796 mas[2]
Distance910 ± 20 ly
(279 ± 6 pc)
Orbit[6]
Period (P)1.613097 d
Semi-major axis (a)≥0.019±0.0001 AU
Eccentricity (e)0.00[7]
Inclination (i)82.7±0.5[8]°
Periastron epoch (T)2,451,875.06581±0.00027 HJD
Semi-amplitude (K1)
(primary)		131.11±0.18 km/s
Semi-amplitude (K2)
(secondary)		142.35±0.18 km/s
Details
A
Mass1.88±0.04[1] M☉
Radius2.28±0.15[1] R☉
Age1.1[1] Gyr
B
Mass1.73±0.04[1] M☉
Radius2.08±0.16[1] R☉
Other designations
HO Tel, CD−47°13121, HD 187418, HIP 97756, SAO 229902[9]
Database references
SIMBADdata

HO Telescopii is an eclipsing binary star system located in the southern constellation of Telescopium. The maximum apparent visual magnitude of 8.22[3] is too faint to be visible to the naked eye. The system is located at a distance of approximately 910 light years based on parallax.[2] The combined stellar classification of the system is A7III(m),[4] matching an evolved A-type star[10] that is possibly metallic-lined. The system is around 1.1[1] billion years old and consists of two stars of similar mass and size.[1]

The variability of this system was discovered by W. Strohmeier, R. Knigge, and H. Ott in 1965.[11][12] It is a detached binary system with both components filling three-fourths of their respective Roche lobes.[1] Their orbital period is 1.613097[6] days with a circularized orbit,[7] and the orbital plane is inclined by 83° to the line of sight from the Earth; close to edge-on.[8] As a consequence, they form an Algol-like eclipsing binary with a magnitude decrease of 0.51 during the primary eclipse and 0.45 during the secondary eclipse.[3]

  1. ^ a b c d e f g h i Cite error: The named reference Sürgit_et_al_2017 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Avvakumova_et_al_2013 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Sürgit2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Khaliullin_Khaliullina_2010 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Grygar_Horak_1980 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Spoelstra_Van_Houten_1972 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Sistero_Candellero_1979 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Strohmeier_et_al_1965 was invoked but never defined (see the help page).