Omicron Cassiopeiae

ο Cassiopeiae
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Cassiopeia
Right ascension	00^h44^m43.5^s
Declination	+48°17′04″
Apparent magnitude (V)	+4.48
Distance	910 ± 210 ly (278 ± 63 pc)
Spectral type	B5IIIe
Other designations
22 Cassiopeiae, HR 193, HD 4180, BD+47°183, FK5 25, HIP 3504, SAO 36620, GC 882, ADS 622, CCDM J00447+4817

Map of the Bayer-designated stars in Cassiopeia. Omicron Cassiopeiae is circled.

Omicron Cassiopeiae (ο Cas, ο Cassiopeiae) is a triple star system in the constellation Cassiopeia. It is approximately 910 light years from Earth.

The primary component, ο Cassiopeiae A, is a blue-white B-type giant with a mean apparent magnitude of +4.54. It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +4.50 to +4.62. The primary is a spectroscopic binary, and its close companion completes one orbit every 2.83 years. A more distant companion, ο Cassiopeiae B, lies 33.6 arcseconds away. It is an eleventh magnitude, yellow-white F-type main sequence dwarf.

Cassiopeia constellation

Stars (list)

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 23 31 32 35 38 40 42 43 44 47 48 49 50 51 52 53 54 55

Variable	R S T V RW RX RZ SU SX SZ TU TV TW TX TY TZ UU UV VX WW WZ XX XY YZ (21) ZZ AB AO AQ AR AZ BH BM BS BY CC CE CF CG CH CW DL DN DO HT IR IT IV IX OX PV PZ QQ QX V364 V368 V373 V376 V381 V425 V436 V459 V465 V482 V487 V509 V523 V526 V540 V547 V551 V559 V567 V592 V623 V627 V636 V638 V639 V640 V641 V649 V650 V664 V705 V709 V723 V742 V745 V746 V761 V762 V773 V801 V805 V812 V819 V987 V988 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 5459 5927 7924 9811 15558 15570 15629 17156 17505 17520 19439 219415 222748 240210 240237

Other	BD+60 2522 1E 2259+586 Gliese 82 Gliese 83.3 IGR J00234+6141 IGR J00291+5934 IRAS 00338+6312 IRAS 23304+6147 LkHα 198 LS I +61 303 MWC 419 MWC 1080 OH 127.8+0.0 PSR B2319+60 PSR B2334+61 PSR J0205+6449 RNO 1B RX J0146.9+6121 2S 0114+650 Tycho G 4U 0115+634 4U 0142+61 W3 IRS 5 WR 1 WR 3

Star clusters

Open	Messier 52 Messier 103 NGC 103 NGC 110 NGC 129 NGC 133 NGC 136 NGC 146 NGC 189 NGC 225 NGC 366 NGC 381 NGC 433 NGC 436 NGC 457 NGC 559 NGC 609 NGC 637 NGC 654 NGC 657 NGC 659 NGC 663 NGC 743 NGC 886 NGC 1027 NGC 7788 NGC 7789 NGC 7790 Trumpler 3

Molecular clouds

AFGL 437
IRAS 00338+6312
Westerhout 3

Nebulae

HII	Heart Nebula NGC 281 NGC 7635 Sh 2-152 S 201 W3A W3(OH) Westerhout 5

Planetary	IC 289 IC 1747 IC 1805 WeBo 1

SNR	Cassiopeia A CTB 1 CTB 109 HB 3 Hubble 12

Pulsar wind	3C 58

Galaxies

NGC	147 185 278 1343

Other	Andromeda VII 3C 20 3C 22 3C 33.1 3C 35 DW 0224+67 Dwingeloo 1 1ES 2344+514 IC 10 IERS B2352+495 Maffei 1 Maffei 2 QSO B0153+744

Other

GRB 041219A
SN 1181
SN 1572

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