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Name
  AG Peg  
AAVSO UID
000-BCP-436 (44223 observations)  
Constellation
Pegasus Sequence
J2000.0
21 51 01.98 +12 37 32.1  (327.75825 +12.62558) Search nearby
B1950.0 21 48 36.23 +12 23 27.3
Proper motion
RA: -1.280 +/- 0.068 mas/yDec: -1.496 +/- 0.066 mas/ySource: Gaia DR1
Galactic coord. 69.278 -30.887
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
1RXS J215102.8+123745 AAVSO 2146+12 ASAS J215102+1237.5
ASASSN-V J215101.96+123733.3 BD+11 4673 HD 207757
HIP 107848 MWC 379 SAO 107436
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Variability type
ZAND+R
Spectral type WN6+M3III
Mag. range
6.0 - 9.4 V
Discoverer Knut Lundmark (1921)
Epoch
31 Jul 1945 (HJD 2431667.5) Ephemeris
Outburst 1870
Period 816.5 d
Rise/eclipse dur. --
Remarks
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1 2013arXiv1312.6063G Pulsation period 55d.
2 GCVS Team SB2 (Porb = 820d [J.B.Hutchings, A.P.Cowley, R.O. Redman, ApJ 201, 404, 1975.]). Maximum of brightness was in 1870, then the very slow light decrease was observed that was superimposed since 1935 by periodical light oscillations with A = 0.4m V and P = Porb: Min = 2428250 + 827.d*E ( JD2428000-43000) [R.Luthardt, IBVS N2495, 1984.]. After JD2442300 the period probably has changed: Min = 2442370 + 760d*E [R.Luthardt, IBVS N2495, 1984.]. In 1962 - 1979 the range of brightness was 7.95m - 8.55m V; M - m = 0.50P. Light minima correspond to the epochs of inferior conjunction of M 3 III component. Spectrum var: Beq (1893 - 1919); since 1922 the spectrum is symbiotic one, the M star spectrum being more noticeable. Surrounded by a radio nebula with 1" half-power diameter.
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References
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1 Tomov, T. V.; Stoyanov, K. A.; Zamanov, R. K., 2016, AG Pegasi - now a
classical symbiotic star in outburst?		 2016MNRAS.tmp.1131T
2 M. Gromadzki, J. Mikolajewska, I. Soszynski, 2013, arXiv:1312.6063
[astro-ph.SR]		 2013arXiv1312.6063G
3 A. Skopal, S. Shugarov, M. Vanko, P. Dubovsky, S. P. Peneva, E. Semkov, M.
Wolf, 2012, arXiv:1203.4932v1 [astro-ph.SR]		 2012arXiv1203.4932S
4 M. Wiecek, M. Mikolajewski, T. Tomov, M. Cikala, C. Galan, A. Majcher, E.
Swierczynski, P. Wychudzki, P. Rozanski, S. Frackowiak, J.L. Janowski, D.
Graczyk, 2010, arXiv:1003.0608v1 [astro-ph.SR]		 2010arXiv1003.0608W
5 G.Pojmanski, Acta Astronomica 52, 397, 2002. 2002AcA....52..397P
6 J.B.Hutchings, A.P.Cowley, R.O. Redman, ApJ 201, 404, 1975. 1975ApJ...201..404H
7 P.W.Merrill, Sky and Tel 18, N9, 490, 1959. --
8 Guthnick, P.; et al., 1925, Benennung von neu entdeckten veränderlichen
Sternen		 1925AN....224..129G
External Links
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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 = 5.00H = 4.37K = 3.85J - K = 1.15
AllWISE W1 = 3.82W2 = 3.56W3 = 3.62W4 = 3.08W1 - W2 = 0.27W3 - W4 = 0.53
APASS-DR9 B = 10.23V = 8.78g' = 9.57r' = 8.09i' = 7.16B - V = 1.45
SDSS-DR12 u = 10.82g = 9.76r = 8.17i = 11.43z = 7.95u - g = 1.06r - i = -3.26
Images
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Supporting Documents
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Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
7 Fernig, Leo 2023-07-05 21:44 UTC Discoverer updated from 1925AN....224..129G page 146.
6 Otero, Sebastian Alberto 2015-06-24 20:12 UTC Type from 2013arXiv1312.6063G.
5 Admin, VSX 2013-12-27 05:50 UTC Update from [2013arXiv1312.6063G].
4 Admin, VSX 2012-03-24 01:31 UTC Update from [2012arXiv1203.4932S].
3 Admin, VSX 2010-03-05 02:43 UTC Update from [2010arXiv1003.0608W].
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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