YZ Cassiopeiae

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YZ Cas
Observation data Epoch J2000 Equinox J2000
Constellation	Cassiopeia
Right ascension	00^h 45^m 39.0777^s^[1]
Declination	+74° 59′ 17.063″^[1]
Apparent magnitude (V)	5.6/6.0^[2]
Characteristics
Spectral type	A2IV^[1]
B−V color index	0.067^[3]
Variable type	Algol variable
Astrometry

Radial velocity (R_v)	+8.9±0.9^[1] km/s
Proper motion (μ)	RA: -14.93^[1] mas/yr Dec.: -21.86^[1] mas/yr
Parallax (π)	11.24 ± 0.55^[1] mas
Distance	290 ± 10 ly (89 ± 4 pc)

Orbit^[1]^[4]
Companion	TYC 4307-2168-1
Period (P)	86580^[4] yr
Other designations
21 Cassiopeiae, HR 192, BD+74 27, HD 4161, SAO 4216, HIP 3572, GC 891, ADS 624 A, CCDM J00457+7459^[1]

YZ Cassiopeiae (21 Cas) is a star system 89 parsecs (290 light years) away from Earth, in the constellation Cassiopeia.^[1] It comprises three stars: an eclipsing Algol-type binary and a visually fainter star about 3000 AU distant.^[4]

The primary star in the YZ Cassiopeiae system is a white subgiant (main sequence) star of spectral type A1m^[3] and 2.31 solar masses^[4] with a less massive main sequence dwarf star of type F2V^[3] and 1.35 solar masses.^[4] The apparent magnitude of the eclipsing binary varies from 5.65 to 6.05^[3] with a period of 4.4672 days.^[4] Combined, they appear to have a spectral type of A2IV.^[4]

The binary has a dimmer (magnitude 9.7 according to Norton,^[2] or 10.5 by SIMBAD) companion of 0.8 solar mass^[4] orbiting with a period of about 86580 years.^[4]

References

↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 "SIMBAD query result: V* YZ Cas -- Eclipsing binary of Algol type". Centre de Données astronomiques de Strasbourg. Retrieved 2008-09-05.
↑ 2.0 2.1 Norton, Arthur P. (1973). Norton's Star Atlas. p. 118. ISBN 0-85248-900-5.
↑ 3.0 3.1 3.2 3.3 Jerzy M. Kreiner, Chun-Hwey Kim, Il-Seong Nha. YZ CAS: Atlas of O-C Diagrams of Eclipsing Binary Stars
↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Tokovinin 1997-1999. J/A+AS/124/75. Multiple star catalogue (MSC)

Coordinates: 00^h 45^m 39.0777^s, +74° 59′ 17.063″

v t e Stars of Cassiopeia

Bayer	α (Schedar) β (Caph) γ (Tsih) δ (Ruchbah) ε (Segin) ζ η (Achird) θ ι κ λ μ ν ξ ο π ρ σ τ υ¹ υ² φ χ ψ ω

Flamsteed	1 2 4 6 9 10 12 13 16 21 23 31 32 35 38 40 42 43 44 47 48 49 50 51 52 53 54 55

Variable	R S T U V W X Y RS RV RW RX RY RZ SU SW SX SY SZ TU TV TW TX TY TZ UU UV VW VX VY WW WY WZ XY ZZ AB AO AQ AR BM BP BY CC CE CF CG CH CW CY DL DN DO HT IR IT OX PV PZ V373 V376 V436 V459 V465 V482 V486 V487 V509 V523 V526 V540 V551 V559 V567 V623 V627 V628 V633 V635 V636 V638 V639 V640 V649 V650 V705 V709 V723 V742 V746 V755 V761 V762 V773 V801 V805 V819 V987 V1022

HR	60 62 96 112 113 124 129 135 144 146 164 177 181 196 200 207 212 233 237 241 244 250 256 260 261 266 273 278 287 292 297 298 316 318 326 342 375 381 391 398 428 439 461 482 488 502 561 567 579 626 743 747 791 839 860 861 922 932 1080 8761 8778 8803 8832 8853 8881 8886 8894 8981 8985 8990 9000 9010 9019 9020 9028 9063 9079 9083 9085 9094

HD	108 371 1142 1601 2665 5459 5927 7924 9811 15558 15570 15629 17156 17505 17520 19439 219415 222748 240210

Gliese	Gliese 22 Gliese 52 Gliese 82

Other	BD+60 2522 1E 2259+586 IRAS 00338+6312 IRAS 23304+6147 LS I +61 303 MWC 1080 OH 127.8-0.0 PSR B2319+60 PSR B2334+61 PSR J0205+6449 RNO 1B RX J0146.9+6121 Tycho G 4U 0142+61 W3 IRS 5 WR 1 WR 3

List

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