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  BZ Tuc  
000-BFN-946 (55 observations)  
Tucana Sequence
00 41 43.43 -73 43 23.6  (10.43096 -73.72322) Search nearby
B1950.0 00 39 50.53 -73 59 49.9
Proper motion
RA: 3.849 +/- 4.711 mas/yDec: -2.067 +/- 1.847 mas/ySource: Gaia DR1
Galactic coord. 303.868 -43.387
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
2MASS J00414344-7343239 ASAS J004145-7343.4 GSC 09141-06735
HV 821 RMC 1 SMC V0233
SON 4792 TYC 9141-6735-1  
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Variability type
Spectral type F8-G1I
Mag. range
11.65 - 12.35 V
Discoverer --
05 Sep 1941 (HJD 2430242.8) Ephemeris
Outburst --
Period 127.447 d
Rise/eclipse dur. 52%
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1 Otero, Sebastian Alberto Remark in IBVS 4437: "Such variability in light curve shape suggests that BZ Tuc cannot be a classical Cepheid. Likewise, it cannot be a type II Cepheid because of its very long period. Possibly BZ Tuc is an RV Tauri variable or alternatively a semiregular variable of the UU Herculis class." However, the ASAS-3 light curve shows the light curve is very regular (not semiregular), the elements are valid at least since 1941 and there is no trace of different minima depth to justify the RV classification. The star is confirmed as a high mass cepheid (Ultra Long Period (ULP) Cepheid) in 2009ApJ...695..874B.
2 GCVS Team P var. Max = 2429849.448 + 127.78d*E (JD2410000 - 35100) [C.Payne-Gaposchkin, S.Gaposchkin, Smith Contr 9, 1966.]; Max = 2441193.541 +127.27d*E (JD2435100 - 43500) [A.M. van Genderen, AsAp Suppl 52, C.Hoffmeister, GuL 2, 345, 1936., A.Briede, Perem. Zvezdy 6, N5, 281, 1949.]; since JD 2443500 - see Table.
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1 Using Ultra Long Period Cepheids to Extend the Cosmic Distance Ladder to
100 Mpc and Beyond
2 G.Pojmanski, Acta Astronomica 52, 397, 2002. 2002AcA....52..397P
3 IBVS #4437 1997IBVS.4437....1B
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = 10.07H = 9.60K = 9.49J - K = 0.58
AllWISE W1 = 9.53W2 = 9.57W3 = 9.62W1 - W2 = -0.04
APASS-DR9 B = 13.29V = 12.16g' = 12.61r' = 11.77i' = 11.46B - V = 1.13
Please review Digitized Sky Survey Acknowledgment and Copyright.
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Revision History
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4 Otero, Sebastian Alberto 2012-05-09 20:53 UTC Reference added.
3 Otero, Sebastian Alberto 2012-05-09 20:51 UTC Elements and range from IBVS 4437 and ASAS-3 data. Rise duration from ASAS-3 data.
2 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.