ADS 1359

ADS 1359 is a quadruple star system in the constellation Cassiopeia. It is composed of two sun like stars in an eclipsing binary with a 2.5-day period, which is in turn orbited by an A-type main-sequence star with a 185-year orbital period. There is also HD 236848 which is a distant proper motion companion.

ADS 1359
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension  01h 44m 17.964s[1]
Declination +57° 32′ 11.81″[1]
Apparent magnitude (V) 6.18[2]
Characteristics
Spectral type G1-2V[3]/G1-2V[3]/A3[4]/G5[5]
U−B color index 0.05[2]
B−V color index 0.13[2]
Variable type Algol[6]
Astrometry
Radial velocity (Rv)7.11±0.30[3] km/s
Proper motion (μ) RA: 46.52±0.52[1] mas/yr
Dec.: 19.17±0.50[1] mas/yr
Parallax (π)17.6 ± 1.5[3] mas
Distance190 ± 20 ly
(57 ± 5 pc)
Orbit[3]
PrimaryADS 1359 A
CompanionADS 1359 B
Period (P)184.9±2.7 yr
Semi-major axis (a)0.911±0.065″
Eccentricity (e)0.794±0.050
Inclination (i)133.3±2.6°
Longitude of the node (Ω)125.4±4.3°
Periastron epoch (T)2021.8±2.1
Argument of periastron (ω)
(secondary)		269.5±8.5°
Orbit[3]
PrimaryADS 1359 Ba
CompanionADS 1359 Bb
Period (P)2.587332±0.000002 d
Semi-major axis (a)9.96±0.06 R⊙
Inclination (i)84.7±2.2°
Semi-amplitude (K1)
(primary)		97.1±0.9 km/s
Semi-amplitude (K2)
(secondary)		97.0±1.6 km/s
Details[3]
ADS 1359 A
Temperature8522±38 K
Rotational velocity (v sin i)84.55±1.42 km/s
ADS 1359 Ba
Mass0.99±0.03 M☉
Radius1.05±0.05 R☉
Temperature5933±131 K
Rotational velocity (v sin i)32.17±2.32 km/s
ADS 1359 Bb
Mass0.99±0.04 M☉
Radius1.05±0.05 R☉
Temperature5693±161 K
Rotational velocity (v sin i)49.10±7.46 km/s
Other designations
BU 870, V773 Cassiopeiae, BD+56°330, HD 10543, HIP 8115, HR 499, WDS J01443+5732[7]
Database references
SIMBADdata

Visual binary

The visual binary was discovered by Sherburne Wesley Burnham at Dearborn Observatory in Chicago in 1880.[8] A first preliminary orbit was calculated in 1971 by astronomer Georgije Popović using observations from 1880 to 1967.[9] Improved orbits were calculated in 1995,[10] 2009[11] and 2017.[3] The two stars were separated by 1.0″ when they were discovered, but only 0.50″ in 2010. The orbit has a high eccentricity and the separation of the two stars varies between about 0.2″ and 1.6″.[3]

Eclipsing binary

ADS 1359 was discovered by the Hipparcos spacecraft to be a detached eclipsing binary and given the variable star designation V773 Cassiopeiae.[12] The derived period of variability was 1.29 days,[6] exactly half the orbital period of the inner pair since each orbit produces two almost-identical eclipses.[3] The eclipsing stars are the inner pair of the system. The two stars combined are still about eight times fainter than the third star and so the eclipses decrease the overall brightness of V773 Cas by less than 0.1 magnitudes.[3]

HD 236848

The Washington Double Star Catalog lists a 16th magnitude companion as component C and a 10th magnitude companion as component D. Component D is HD 236848 and it shares the same space motion and distance as the inner three stars.[11]

gollark: If we don't tell the computer about them, it's fine.
gollark: Don't tell anyone or they might notice.
gollark: Also, there's an unprocessed application.
gollark: I am ABSTAINING, bee.
gollark: So just me, more or less than 22.7%, or 22.7%, of the time.

References
  1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  2. Guetter, H. H.; Hewitt, A. V. (1984). "Photoelectric UBV photometry for 317 PZT and VZT stars". Publications of the Astronomical Society of the Pacific. 96: 441–443. Bibcode:1984PASP...96..441G. doi:10.1086/131362.
  3. Zasche, P.; et al. (2017). "V773 Cas, QS Aql, and BR Ind: Eclipsing Binaries as Parts of Multiple Systems". The Astronomical Journal. 153 (1). 36. arXiv:1701.02537. Bibcode:2017AJ....153...36Z. doi:10.3847/1538-3881/153/1/36.
  4. Appenzeller, Immo (1967). "MK Spectral Types for 185 Bright Stars". Publications of the Astronomical Society of the Pacific. 79 (467): 102–109. Bibcode:1967PASP...79..102A. doi:10.1086/128449.
  5. Halbwachs, J. L. (1986). "Common proper motion stars in the AGK 3". Astronomy and Astrophysics Supplement Series. 66: 131–148. Bibcode:1986A&AS...66..131H.
  6. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  7. "V773 Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-24.
  8. Burnham, Sherburne Wesley (1883). "Double-star Observations made in 1879 and 1880 with the 18½ inch Refractor of the Dearborn Observatory, Chicago, US". Memoirs of the Royal Astronomical Society. 47: 167–202. Bibcode:1883MmRAS..47..167B.
  9. Popović, G. M. (1971). "The orbits of four visual double stars. (ADS 1359, 2377, 9126 and 16873)" (PDF). Bulletin de l'Observatoire Astronomique de Belgrade. 29 (125): 31–36. Bibcode:1971BOBeo..29...31P.
  10. Popović, G. M.; Pavlovic, R. (1995). "Orbital elements of 13 double stars". Bulletin Astronomique de Belgrade. 151: 45–74. Bibcode:1995BABel.151...45P.
  11. Hartkopf, William I.; Mason, Brian D. (2009). "Speckle Interferometry at Mount Wilson Observatory: Observations Obtained in 2006–2007 and 35 New Orbits". The Astronomical Journal. 138 (3): 813–826. Bibcode:2009AJ....138..813H. doi:10.1088/0004-6256/138/3/813.
  12. Kazarovets, E. V.; et al. (1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars. 4659: 1. Bibcode:1999IBVS.4659....1K.
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