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Name
  RZ Cas  
AAVSO UID
000-BBF-490 (66855 observations)  
Constellation
Cassiopeia Sequence
J2000.0
02 48 55.50 +69 38 03.0  (42.23125 +69.63417) Search nearby
B1950.0 02 44 22.79 +69 25 34.2
Galactic coord. 132.886 +9.066
Other names

(Internal only)
AAVSO 0239+69 AN 77.1906 BD+69 179
HD 17138 HIP 13133 HR 815
SAO 12445    
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Variability type
EA/SD
Spectral type A2.8V
Mag. range
6.18 - 7.72 V
Discoverer --
Epoch
25 Feb 1977 (HJD 2443200.3063) Ephemeris
Outburst --
Period 1.195247 d
Rise/eclipse dur. 17%  (4.88 h)
Remarks
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1 Otero, Sebastian Alberto DSCT period 0.01557771 d. Period and epoch in the table are from TESS 2024 data and show a period increase (BAA-VSS Circular #203).
2 Otero, Sebastian Alberto DSCT period and amplitude are variable P= 0.016 d., amplitude 0.02 mag.
3 GCVS Team Min II 6.26. The light curve shape var; d var (0.000P <= d <= 0.009P). P var, variations are irregular. Mean elements based on visual and photographic observations: Min I = 2416886.8806 + 1.195253065d*E (JD2416800 - 26700) [A. de Sitter, BAN 7, 119, 1933.], Min I = 2432820.7853 + 1.1952517d*E (JD2426700 - 34000) [R.Szafraniec, AAB 2, 86, 1953.]. From photoelectric observations: Min I = 2432115.5827 + 1.1952472d*E (JD2429870 - 30400); Min I = 2432085.7011 + 1.195259d*E (JD2432000 - 32460); Min I = 2434349.5130 + 1.1952525d*E (JD2432450 - 34420); Min I = 2434703.3035 + 1.195238d*E (JD2434420 - 34705); Min I = 2435934.4087 + 1.1952499d*E (JD2434705 - 35950); Min I = 2438829.2818 + 1.195243d*E (JD2436800 - 39100); Min I = 2440182.3089 + 1.195259d*E (JD2439380 - 40200); Min I = 2441333.3257 + 1.195244d*E (JD2440500 - 41350); Min I = 2442327.7798 + 1.1952521d*E (JD2441550 - 42350); since JD2442850 - see Table.
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References
Click reference title/citation to view in new window. Roll over index number to view submission details.
1 C. Lloyd, 2018, Autumn Eclipsing Binaries BAA-VSS Circular #177, 2018
2 Lloyd, C., 2025, The period behaviour of the bright Algol binary RZ Cas --
3 Samus, N. N.; Kazarovets, E. V.; Durlevich, O. V.; et al., 2017, General
Catalogue of Variable Stars: Version GCVS 5.1 (November 2019)		 2017ARep...61...80S
4 Bob Nelson's O-C files, 2016 --
5 J.Mattei, E.Mayer, M.Baldwin, Sky and Tel 60, N4, 285, 1980. --
6 S.Gaposchkin, HA 115, N15, 1950. 1956CoKon..41...18H
7 CALEB - Catalog and AtLas of Eclipsing Binaries --
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Supporting Documents
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Revision History
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5 Otero, Sebastian Alberto 2025-03-17 20:20 UTC Period and epoch from BAA-VSS Circular #203.
4 Otero, Sebastian Alberto 2020-05-23 03:31 UTC Period, epoch and eclipse duration from the GCVS (November 2019 version).
3 Otero, Sebastian Alberto 2019-03-01 11:55 UTC Type, spectral type and elements from BAA-VSS Circular #177.
2 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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