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V2527 Oph outburst 大物アウトバーストです。V2051 Oph よりも若干北側なので、V2051 Oph を観測 された方はほとんどそのまま観測可能と思います（食はなさそうなので、積分時間 は通常通りでよいと思います）。時期もよいし、後は天気に恵まれれば、という ところ。確実な成功が期待できます。 ＃実はこの天体歴史が長いもので、かつて「月刊天文」で書いていたころに紹介した ＃ことがあります。 V2527 Oph outburst!! As reported in [vsnet-outbust 5472], the (still poorly known) SU UMa-type dwarf nova V2527 Oph = 1E1719.1-1946 = 1RXS J172204.5-194913 is undergoing a very bright outburst! The current magnitude surpasses the past record, and the object is most likely undergoing a superoutburst! The outburst must be young, and the present outburst will provide *the best* opportunity to record the superhumps in this object first-ever in detail. The semi-accurate location of the object is reported to be 17:22:04.3 -19:49:08 (J2000.0). The object is an X-ray source selected from Einstein survey, and later spectroscopic observation cunfirmed its CV nature. The VSNET team has been monitoring the object upon knowing that this spectrum resembles that of a short-period (presumably SU UMa-type) dwarf nova. The spectrum suggests a dwarf nova with a low mass-transfer rate, just as in WZ Sge. CCD time-resolve observations (as long as possible, preferrably several hours per night) are strongly encouraged. Please use the usual SU UMa-type observing prescription. We are also happy to receive representative images (in FITS) for accurate astrometry and quiescence identidication. The reported quiescent magnitude is V=19.02. I will make more comments on this object later. Good luck with your observations! YYYYMMDD(UT) mag observer 20030311.758 <144 (Rod Stubbings) 20030315.726 <144 (Rod Stubbings) 20030331.647 <144 (Rod Stubbings) 20030402.614 <144 (Rod Stubbings) 20030404.642 <144 (Rod Stubbings) 20030405.681 <144 (Rod Stubbings) 20030406.716 <144 (Rod Stubbings) 20030409.651 <144 (Rod Stubbings) 20030413.762 <146 (Rod Stubbings) 20030424.573 <140 (Rod Stubbings) 20030425.601 <144 (Rod Stubbings) 20030426.608 <144 (Rod Stubbings) 20030428.576 <148 (Rod Stubbings) 20030429.596 <146 (Rod Stubbings) 20030502.614 138 (Rod Stubbings) Regards, Taichi Kato VSNET Collaboration team
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