[vsnet-alert 4010] V1159 Ori slightly reduced activity?

[Taichi Kato <tkato>]

V1159 Ori slightly reduced activity?

  The ER UMa-type dwarf nova (SU UMa star with an exceptionally short
supercycle length) V1159 Ori may have somewhat reduced its outburst
activity in this season.  Since 1999 Dec. 4, the system has not shown
a superoutburst, which is expected in early January.  The outburst cycle
length (of normal outbursts) may have also slightly lengthened, while
the superoutburst duration seems to have been shortened.
  Observers are strongly urged to keep the present good coverage of this
object, and other ER UMa stars (ER UMa, RZ LMi, DI UMa).  The supercycle
of RZ LMi may have been slightly changed as inferred from recent reports.

  V1159 Ori recent observations:

  YYYYMMDD(UT)   mag  observer
  19991204.646  <137  (T. Watanabe)
  19991205.076   142  (G. Poyner)
  19991205.663   148  (R. Stubbings)
  19991206.500   148  (R. Stubbings)
  19991207.580   136  (T. Watanabe)
  19991207.694  <138  (H. Maehara)
  19991207.906   139  (E. Muyllaert)
  19991207.980   138  (J. Ripero)
  19991208.062   139  (G. Poyner)
  19991209.545   147  (R. Stubbings)
  19991209.887  <136  (E. Muyllaert)
  19991210.485   147  (R. Stubbings)
  19991211.680  <138  (H. Maehara)
  19991212.635  <139  (T. Watanabe)
  19991212.994  <136  (H. McGee)
  19991213.644  <138  (H. Maehara)
  19991213.669  <137  (T. Watanabe)
  19991214.012  <146  (G. Poyner)
  19991214.666  <147  (R. Stubbings)
  19991214.885   140: (E. Muyllaert)
  19991215.599   139  (T. Watanabe)
  19991215.875  <136  (E. Muyllaert)
  19991216.674  <139  (T. Watanabe)
  19991217.485  <137  (R. Stubbings)
  19991219.503   138  (R. Stubbings)
  19991219.988  <145  (G. Poyner)
  19991220.513  <137  (R. Stubbings)
  19991220.617  <134  (T. Watanabe)
  19991222.631  <132  (H. Maehara)
  19991224.613  <133  (T. Watanabe)
  19991225.474  <132  (T. Watanabe)
  19991225.637  <138  (H. Maehara)
  19991226.547  <132  (H. Maehara)
  19991226.647  <134  (T. Watanabe)
  19991228.233   136: (M. Simonsen)
  19991228.874  <136  (E. Muyllaert)
  19991228.910  <136  (H. McGee)
  19991229.607  <135  (T. Watanabe)
  19991229.930  <136  (E. Muyllaert)
  19991231.242   150: (G. Hanson)
  19991231.662  <146  (R. Stubbings)
  20000101.499   148  (R. Stubbings)
  20000101.941   134  (J. Ripero)
  20000102.491   137  (R. Stubbings)
  20000102.960   135  (J. Ripero)
  20000103.200   142  (L. E. Shaw)
  20000103.599   146  (R. Stubbings)
  20000103.687  <132  (H. Maehara)
  20000103.994   143  (G. Poyner)
  20000104.219   147: (G. Hanson)
  20000104.517   148  (R. Stubbings)
  20000104.519  <132  (H. Maehara)
  20000104.897  <136  (E. Muyllaert)
  20000104.958  <146  (G. Poyner)
  20000105.214   150: (G. Hanson)
  20000105.597   148  (R. Stubbings)
  20000105.853  <136  (E. Muyllaert)
  20000106.187   148: (G. Hanson)
  20000106.506   148  (R. Stubbings)
  20000106.853  <136  (P. A. Dubovsky)
  20000106.926  <136  (E. Muyllaert)
  20000106.946  <136  (H. McGee)
  20000107.488   136  (R. Stubbings)
  20000107.599   138  (T. Watanabe)
  20000108.194   138  (G. Hanson)
  20000108.333   135: (M. Simonsen)
  20000108.498   140  (R. Stubbings)
  20000108.892  <136  (H. McGee)
  20000108.983   142  (G. Poyner)
  20000109.291   146: (G. Hanson)
  20000109.485  <146  (R. Stubbings)
  20000109.969   149  (G. Poyner)
  20000110.492   148  (R. Stubbings)
  20000111.244  <136  (M. Simonsen)
  20000111.544   149  (R. Stubbings)
  20000112.478   144  (R. Stubbings)
  20000112.578   139  (R. Stubbings)

Regards,
Taichi Kato

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