COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 980 Konkoly Observatory Budapest 1975 March 20 PHOTOGRAPHIC PHOTOMETRY OF BD +60deg2289, A NEW BRIGHT ECLIPSING BINARY During a variable star search in a field of 6 x 6 square degrees centered on mu Cep the star BD +60deg2289 was discovered to be a new variable. Its light curve was derived by means of photographic photometry of 101 patrol plates, which have been obtained mainly between May 1969 and July 1971 with the astrograph of Hoher List Observatory (F/5; F= 1500 mm). The photometry was carried out with a Becker iris photometer using 5 suitable nearby standard stars, which have been calibrated with a UBV - sequence in the southern part of the field. This sequence itself had been derived by means of photographic transfer of a photoelectric UBV -sequence in the nearby cluster NGC 7128 (Hoag, A.A. et al. 1961, Publ. US Naval Obs. Vol. 17 part 7). The results of the photometry are given in the Table. The mean error turned out to be epsilon=+-0m.06. Using the 7 Minima fainter than 10m.3 the best period was found by least squares fit. The Figure shows the light curve of BD +60deg2289 plotted over phase using the derived light elements Min = JD 2441130.51 + 2d.10438.E +-1 +-2 [FIGURE 1] The light curve shows that the variable is an eclipsing binary of type "EB" with Max = 9m.8 Min I = 10m.5 Min II = 9m.9 The scatter of the measurements, which is larger than expected from the above estimates of the error, may be due to a faint unresolved nearby star, disturbing slightly the photographic image of the variable. But it seems more probable, that this large scatter comes from an intrinsic property of the binary itself. This question, however, has to be answered by means of photoelectric investigation. Acknowledgements: This work was supported partly by Landesamt fur Forschung, Dusseldorf, and Deutsche Forschungsgemeinschaft (Az.Schm 167/12). F. GIESEKING Astronomische Institute der Universitat Bonn Observatorium Hoher List JD_Hel 2400000+ m_pg JD_Hel 2400000+ m_pg 39388.3774 9m.86 40565.4283 9m.90 39389.4225 9.80 40714.4922 9.81 39390.3545 9.85 40720.5475 9.84 39391.3663 9.85 40732.5136 9.92 39531.2749 9.91 40739.4409 9.92 39533.2679 10.46 40739.5089 9.89 39534.2763 9.80 40740.4590 9.90 40289.3012 9.85 40740.5500 9.88 40368.5448 9.85 40741.4680 9.92 40381.5210 9.86 40746.5280 9.90 40382.5269 9.74 40749.4620 10.12 40383.5370 10.13 40749.5260 10.25 40418.9670 9.75 40774.4590 9.91 40422.5456 9.81 40775.4563 9.82 40425.5506 10.45 40776.4458 9.87 40426.5507 9.86 40777.4987 9.84 40437.5330 9.67 40780.5467 9.90 40439.4845 9.76 40781.4579 9.85 40439.5776 9.74 40795.5605 9.98 40440.4297 9.86 40797.4648 9.90 40440.5213 9.79 40798.5572 9.81 40441.4131 9.70 40804.4658 10.08 40441.5013 9.69 40916.2948 9.89 40442.5152 9.86 40917.3677 9.86 40443.4381 9.93 40981.3246 9.97 40443.5430 9.85 41070.5608 10.00 40444.5264 10.33 41071.5601 10.51 40445.4167 9.89 41075.5595 10.01 40447.4084 9.85 41098.4976 9.94 40447.5022 9.82 41104.5131 9.91 40464.3867 9.76 41125.4750 9.89 40466.3930 9.82 41125.5243 9.86 40467.5285 10.09 41126.5015 9.93 40475.4390 9.79 41127.5126 9.89 40476.4169 9.84 41130.5065 10.44 40477.5238 9.80 41133.5026 9.92 40485.4941 9.84 41134.5151 9.98 40499.3290 9.99 41136.5318 9.96 40499.5137 9.85 41146.4461 9.98 40500.4082 9.75 41148.4885 9.98 40501.4026 9.97 41149.4907 10.58 40504.3720 9.83 41150.4323 9.98 40508.4004 9.77 41151.5262 10.54 40510.3650 9.77 41153.4429 9.92 40514.3810 9.76 41154.4291 9.85 40514.5143 9.69 41159.5091 9.85 40515.5567 9.73 41161.4474 9.87 40531.3008 9.72 41161.5259 9.84 40531.5265 9.79 41162.4551 9.32 40532.3480 9.79 41164.5123 9.75 40557.4230 9.80