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Latest Details
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| Name |
BD+56 2647 |
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| AAVSO UID |
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| Constellation |
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| J2000.0 |
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| B1950.0 |
21 46 14.00 +56 57 22.0 |
| Proper motion |
| RA: -6.987 +/- 1.137 mas/y | Dec: -4.346 +/- 0.673 mas/y | Source: Gaia DR1 |
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| Galactic coord. |
100.005 +2.729 |
Other names
(Internal only)
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2MASS J21475113+5711201 |
ASASSN-V J214751.00+571119.4 |
GSC 03976-01677 |
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TYC 3976-1677-1 |
UCAC4 736-080234 |
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| Variability type |
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DSCT |
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| Spectral type |
-- |
| Mag. range |
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10.57 - 10.61 Rc |
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| Discoverer |
Giuseppe Marino |
| Epoch |
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| Outburst |
-- |
| Period |
0.16728 d (4.015 h) |
| Rise/eclipse dur. |
-- |
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Remarks
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Some references may be clicked to view in new window. Roll over index number to view submission details.
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1 |
Marino, Giuseppe
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The observations were performed with the support of Gruppo Astrofili Catanesi at the private observatory of Giuseppe Giardina. |
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2 |
Marino, Giuseppe
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Light curves and their amplitude are given for both the variable star (BD+56 2647) and its optical companion (2MASS J21475113+5711201) not well resolved on the original images. |
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3 |
Marino, Giuseppe
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The amplitude of variation changed from 0.04 mag. (6 Dec. 2013) to 0.01 mag. (17 Dec. 2013).
The variable has an optical companion (2MASS J21475157+5711227, V= 13.7:; sep. 4.3") not well resolved on the CCD exposures. However, the stability of this companion was accurately checked by properly positioning the photometric apertures. Claudia Russo, Dosithea Aiello, Xiomara Arena, Caterina Burgio, Brendon Dzema, Ilenia Privitera and Enrica Torrisi (Liceo Linguistico S. Orsola - Catania - ITALY) co-workers. |
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References
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There are currently no additional references filed for this star.
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External Links
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Location
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Catalog Data
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Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
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2MASS
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J = 9.35 | H = 9.11 | K = 9.03 | J - K = 0.32 |
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AllWISE
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W1 = 8.83 | W2 = 8.84 | W3 = 8.85 | W4 = 8.38 | W1 - W2 = -0.01 | W3 - W4 = 0.47 |
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APASS-DR9
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B = 11.53 | V = 10.79 | g' = 11.17 | r' = 10.63 | i' = 10.31 | B - V = 0.74 |
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Images
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Please review Digitized Sky Survey Acknowledgment and Copyright.
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Supporting Documents
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2 |
Light curves for each night
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Marino, Giuseppe
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2013-12-19 23:46 UTC |
Differential photometry obtained using 1 comparison star very near the variable (2MASS J21475189+5711375). A check star was also used. R_c magnitudes at the max. and min. were determined via ensemble photometry using 3 comparison stars. The R_c magnitude of the comparison stars were deduced from APASS by mean the formulae given by Munari, JAAVSO, 40, 582 (2012). |
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Phase light curve
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Marino, Giuseppe
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2013-12-19 23:46 UTC |
Phased light curve.
Ephemeris:
HJD(Max) = 2456633.297095 + 0.167280d E |
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Revision History
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Currently approved revision is checked. Click revision number to view details of that revision.
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