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Name
  RR Lyr  
AAVSO UID
000-BCG-719 (45443 observations)  
Constellation
Lyra Sequence
J2000.0
19 25 27.91 +42 47 03.7  (291.36629 +42.78436) Search nearby
B1950.0 19 23 52.25 +42 41 11.6
Proper motion
RA: -109.577 +/- 0.060 mas/yDec: -195.867 +/- 0.063 mas/ySource: Gaia DR1
Galactic coord. 74.952 +12.304
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 1922+42 AN 34.1901 BD+42 3338
HD 182989 HIP 95497 HV 180
KIC 07198959 KIC 7198834 KIC 7198846
KIC 7198881 KIC 7198906 KIC 7198959
KIC 7199002 KIC 7199010 KIC 7199013
KIC 7199036 KIC 7199037 KIC 7199058
KIC 7199087 KIC 7199135 KIC 7199240
KIC 7280687 KID 07198959 SAO 48421
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Variability type
RRAB/BL
Spectral type A5.0-F7.0
Mag. range
7.17 - 8.14 V
Discoverer --
Epoch
27 Jul 2021 (HJD 2459422.522) Ephemeris
Outburst --
Period 0.566772 d  (13.6025 h)
Rise/eclipse dur. 16%  (2.18 h)
Remarks
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1 Otero, Sebastian Alberto Phase shift around 2008-2009. Elements HJD 2459422.522 + 0.566772 x E are valid between 2012 and 2024.
2 Otero, Sebastian Alberto Period in the table (0.566782 d.) is valid for 2016-2018.
3 2013arXiv1307.5820N Blazhko period of 39.20 days from Kepler data.
4 GCVS Team mu alpha = -0.11", mu delta = -0.19". [Fe/H] = -1.14; Delta(S) = 6. Blazhko effect of variable amplitude (practically to complete disappearance of Blazhko effect); Pi = 40.8d. Variations of Max light phase up to 0.14P; magnitude in Max var in the range up to 0.6m, that in Min var in the range up to 0.1m [G.W.Preston, J.Smak, B.Paczynski, ApJ Suppl 12, N104, 1965.].According to [L.Detre, B.Szeidl, "Variable Stars in the Globular Clusters and Related Systems", IAU Coll N21, Toronto, P. 31, 1973.], a cycle ~4 yr is present in Blazhko effect amplitude changes; at the end of the cycle the Blazhko effect phase changes abruptly by 0.25Pi. Magnetic field strength varies with the pulsational period [Yu.S.Romanov, S.N.Udovichenko, Soobshch. Spets. Astrofiz. Obs. Issue 32, 15, 19]. P var. Max = 2414856.480 + 0.56682069d*E (JD2414800 - 18800); Max = 2421854.052 + 0.56685169d*E (JD2418800 - 26500) [J.Hellerich, AN 227, 133, 1926.]; Max = 2426571.3828 + 0.56684333d*E (JD2426500 - 32500) [Yu.S.Romanov, Yu.T.Fedotov, A.I. Movchan, Astron. Tsirk. N1205, 4, 1982.]; Max = 2438215.9492 + 0.566830d*E (JD2438000 - 41000) [SAC N39, 1968.]; Max = 2438215.9492 + 0.56683313d*E (JD2441000 - 42900) [Yu.S.Romanov, Yu.T.Fedotov, A.I. Movchan, Astron. Tsirk. N1205, 4, 1982.]; since JD2442900 - see Table.
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References
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1 McQuillan, A.; Mazeh, T.; Aigrain, S., 2014, Rotation Periods of 34,030
Kepler Main-sequence Stars: The Full Autocorrelation Sample		 2014ApJS..211...24M
2 J.M. Nemec, J.G. Cohen, V. Ripepi et al., 2013, arXiv:1307.5820
[astro-ph.SR]		 2013arXiv1307.5820N
3 Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016) 2002AJ....123..473B
4 Yu.S.Romanov, Yu.T.Fedotov, A.I. Movchan, Astron. Tsirk. N1205, 4, 1982. 1982ATsir1205....4R
5 H.L.Giclas, R.Burnham, N.G.Thomas, Lowell Bull N120, 1963. --
6 Kepler data (MAST) --
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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 = 6.95H = 6.69K = 6.65J - K = 0.30
Images
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Supporting Documents
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Revision History
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7 Otero, Sebastian Alberto 2024-06-03 21:16 UTC Period and epoch from AAVSO data.
6 Otero, Sebastian Alberto 2023-08-09 15:07 UTC Period from AAVSO data.
5 Otero, Sebastian Alberto 2022-08-14 23:27 UTC Elements from AAVSO V data.
4 Otero, Sebastian Alberto 2018-07-31 03:54 UTC Period, epoch, rise duration and range from AAVSO V data.
3 Admin, VSX 2015-12-19 02:44 UTC Updated variability type to indicate Blazhko effect.
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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