Variable
Star Bulletin
Each issue is available in PDF.
No.121 2023 Jul.
PDF
SDSS J183131.63+420220.2: AM CVn star showing ER UMa-type behavior and long standstill
Taichi Kato
No.120 2023 Jul.
PDF
ASASSN-22ak: La Belle au bois dormant in a hydrogen-depleted dwarf nova?
Taichi Kato, Franz-Josef Hambsch, Berto Monard and Rod Stubbings
No.119 2023 May
PDF
Long-lasting high state of the high-field polar AR UMa
Taichi Kato
No.118 2023 May
PDF
Low state in the post-nova V1315 Aql
Taichi Kato
No.117 2023 May
PDF
Double outbursts in V544 Her and ASASSN-19yt
Taichi Kato
No.116 2023 May
PDF
The 2022 active state of the AM CVn star NSV 1440
Taichi Kato, Rod Stubbings
No.115 2023 Apr.
PDF supplementary data
Eclipse observations of V838 Her (Nova Her 1991) during nova eruption
Taichi Kato
No.114 2023 Apr.
PDF
SDSS J094002.56+274942.0: an SU UMa star with an orbital period of3.92 hours and an apparently unevolved secondary
Taichi Kato, Tonny Vanmunster
No.113 2023 Apr.
PDF
MASTER OT J055845.55+391533.4: SU UMa star with a dip and long rebrightening
Taichi Kato, Hiroshi Itoh, Tonny Vanmunster, Seiichiro Kiyota, Katsuaki
Kubodera,Pavol A. Dubovsky, Igor Kudzej, Tomáš Medulka, Filipp D.
Romanov and David J. Lane
No.112 2023 Apr.
PDF
CM Mic and other ER UMa stars showing standstills
Taichi Kato and Naoto Kojiguchi
No.111 2023 Feb.
PDF
MGAB-V240: 23-min AM CVn star showing both 12-d supercycle and standstills
Taichi Kato
No.110 2023 Feb.
PDF
On the orbital period of the dwarf nova CW Mon
Taichi Kato and Franz-Josef Hambsch
No.109 2023 Feb.
PDF
ASASSN-15cm: an SU UMa star with an orbital period of 5.0 hours
Taichi Kato
No.108 2023 Feb.
PDF
Visual,CCD and DSLR minima of eclipsing binaries during 2022
Kazuo Nagai
No.107 2023 Feb.
PDF
Genuine standstill in the AM CVn star CR Boo
Taichi Kato, Yutaka Maeda, Masayuki Moriyama
No.106 2023 Feb.
PDF
SU UMa-type supercycle in the IW And-type dwarf nova BO Cet above the period gap
Taichi Kato
No.105 2023 Jan.
PDF
LS And: WZ Sge-type outburst first time since the 1971 discovery
Taichi Kato
No.104 2023 Jan.
PDF
Very low state in PY Per in 2022
Taichi Kato
No.103 2022 Oct.
PDF
The TESS light curves of three short period Algol-type systems; X Tri is a real pulsator
Shin-ya Narusawa and Kazuo Nagai
No.102 2022 May PDF
Analysis of TESS observations of V844 Her during the 2020 superoutburst
Taichi Kato
No.101 2022 May PDF
Negative superhumps in the eclipsing Z Cam + VY Scl star ES Dra
Taichi Kato
No.100 2022 Apr. PDF
Z Cam star PY Per in SU UMa state?
Taichi Kato
No.99 2022 Apr.
PDF
Gaia19bxc: possible polar below the period minimum
Taichi Kato
No.98 2022 Apr.
PDF
Romanov V48: unusual intermediate polar in the period gap
Taichi Kato and Filipp D. Romanov
No.97 2022 Mar.
PDF
Gaia22ayj: outburst from a deeply eclipsing 9.36-min binary?
Taichi Kato
No.96 2022 Mar.
PDF
WFI J161953.3+031909: eclipsing ER UMa-type and Z Cam-type starin the period gap
Taichi Kato
No.95 2022 Mar.
PDF
V476 Cyg (Nova Cyg 1920) is currently a dwarf nova ― first such an object in the period gap?
Taichi Kato
No.94 2022 Mar.
PDF
Long-lasting standstill and fading episode in the IW And star V507 Cyg
Taichi Kato and Masayuki Moriyama
No.93 2022 Mar.
PDF
On the identity of Tsesevich’s “YY Dra”
Taichi Kato and Elena P. Pavlenko
No.92 2022 Feb.
PDF
Analysis of the IW And star ASAS J071404+7004.3
Taichi Kato, Kiyoshi Kasai, Elena P. Pavlenko, Nikolaj V. Pit, Aleksei
A. Sosnovskij,
Hiroshi Itoh, Hidehiko Akazawa, Stephen M. Brincat, Leonid E. Keir,
Sergei N. Udovichenko,
Yusuke Tampo, Naoto Kojiguchi, Masaaki Shibata, Yasuyuki Wakamatsu,
Tamás Tordai,
Tonny Vanmunster and Charles Galdies
No.91 2022 Feb.
PDF
Visual, DSLR and CCD minima of eclipsing binaries during 2021
Kazuo Nagai
No.90 2022 Feb.
PDF
Emerging ordinary superhumps as the standard candle for WZ Sge stars
Taichi Kato
No.89 2022 Jan.
PDF
Evolution of short-period
cataclysmic variables: implications from eclipse modeling and stage A
superhump method (with New Year’s gift)
Taichi Kato
No.88 2021 Dec.
PDF
Orbital period of the IW And-type star ST Cha
Taichi Kato
No.87 2021 Dec.
PDF
Study of the low-amplitude Z Cam star IX Vel
Taichi Kato
No.86 2021 Nov.
PDF
A code for two-dimensional
frequency analysis using the Least Absolute Shrinkage and Selection
Operator (Lasso) for multidisciplinary use
Taichi Kato
No.85 2021 Nov.
PDF
Periodic modulations during a long outburst in V363 Lyr
Taichi Kato
No.84 2021 Nov.
PDF
ASASSN-19ax: SU UMa-type dwarf nova with a long superhump period and post-superoutburst rebrightenings
Taichi Kato, Hiroshi
Itoh, Seiichiro Kiyota, Tonny Vanmunster, Tamás Tordai,
Yusuke Tampo, Naoto
Kojiguchi, Masaaki Shibata, Junpei Ito, Roger D. Pickard, Sjoerd Dufoer
No.83 2021 Oct.
PDF
On the nature of embedded precursors in long outbursts of
SS Cyg stars as inferred from observations of the IW And star ST Cha
Taichi Kato and Franz-Josef Hambsch
No.82 2021 Oct.
PDF
Algol-type system RZ Cas: Times of primary minima by different methods
Shin-ya Narusawa and Kazuo Nagai
No.81 2021 Sep.
PDF
Orbital and spin periods of the candidate white dwarf pulsar
ASASSN-V J205543.90+240033.5
Taichi Kato,
Franz-Josef Hambsch, Elena P. Pavlenko, Aleksei A. Sosnovskij
No.80 2021 Aug.
PDF
ASASSN-V J205543.90+240033.5: another white dwarf pulsar?
Taichi Kato
No.79 2021 Aug.
PDF Reviced on Nov.15, 2021
MP Gem: VY Scl-type star, finally
Taichi Kato
No.78 2021 Jul.
PDF
MGAB-V859 and ZTF18abgjsdg: ER UMa-type dwarf novae showing standstills
Taichi Kato and Naoto Kojiguchi
No.77 2021 Jul.
PDF
ZTF J185139.81+171430.3 = ZTF18abnbzvx: the second white dwarf pulsar?
Taichi Kato and Naoto Kojiguchi
No.76 2021 Jul.
PDF
V606 Aql (Nova Aquilae 1899) is now a dwarf nova
Taichi Kato and Naoto Kojiguchi
No.75 2021 Jul.
PDF
On the superhumps and mass ratio of CzeV404
Taichi Kato
No.74 2021 Jul.
PDF
Optical Variability Correlated with X-ray Spectral Transition
in the Black-Hole Transient ASASSN-18ey = MAXI J1820+070
Keito Niijima, Mariko
Kimura, Yasuyuki Wakamatsu, Taichi Kato, Daisaku Nogami, Keisuke Isogai
Naoto Kojiguchi,
Ryuhei Ohnishi, Megumi Shidatsu, Geoffrey Stone, Franz-Josef Hambsch,
Taḿas Tordai, Michael Richmond, Tonny Vanmunster, Gordon Myers, Stephen M. Brincat,
Pavol A. Dubovsky,
Tomas Medulka, Igor Kudzej, Stefan Parimucha, Colin Littlefield,
Berto Monard, Joseph
Ulowetz, Elena P. Pavlenko, Oksana I. Antonyuk, Aleksei A. Sosnovskij,
Aleksei V. Baklanov,
Kirill A. Antoniuk, Nikolai V. Pit. Sergei P. Belan, Julia V. Babina,
Aleksandr S. Sklyanov,
Anna M. Zaostrozhnykh, Andrew V. Simon, Lewis M. Cook, Ian Miller,
Hiroshi Itoh, Domenico
Licchelli, Shawn Dvorak, Richard Sabo, Yenal Ögmen, Donn R. Starkey,
Peter Nelson, Enrique
de Miguel, Charles Galdies, Kenneth Menzies, Seiichiro Kiyota,
Arto Oksanen, Roger D.
Pickard, Alexandra M. Zubareva, Klaus Wenze and Denis Denisenko
No.73 2021 Feb.
PDF
New Times of Minima of Algol type Systems XZ And, AB Cas and β Per
Shin-ya Narusawa and Hidehiko Akazawa
No.72 2021 Feb.
PDF
Multisite photometry of Algol-type binary system RZ Cas
Shin-ya Narusawa,
Hidehiko Akazawa, Kikuichi Arai, Mitugu Fujii, Fredy Doncel Invernizzi,
Masayuki Ioroi, Yoshiharu Ito, Koichi Morikawa and Nobuo Ohkura
No.71 2021 Feb.
PDF
The flat bottom of the primary minimum of Algol-type system BR Cyg
Shin-ya Narusawa
No.70 2021 Feb.
PDF
Reassess RZ Cas light curves at primary minima during 1995-1996
Shin-ya Narusawa, Kikuichi Arai, Mitugu Fijii, Kazuo Nagai and Takeshi Yasuda
No.69 2021 Feb.
PDF
Visual, DSLR and CCD minima of eclipsing binaries during 2020
Kazuo Nagai
No.68 2020 Dec.
PDF
Photometric observations of nine Algol systems
Shin-ya Narusawa and Yasuhisa Nakamura
No.67 2020 Feb.
PDF
Visual, DSLR and CCD minima of eclipsing binaries during 2019
Kazuo Nagai
No.66
2019 Jan.
PDF
Visual, DSLR and CCD minima of eclipsing binaries during 2018
Kazuo Nagai
No.65
2018 Oct.
PDF
CCD and DSLR maxima of RR Lyrase stars in 2016 and 2017
-Joint publication: GEOS circular RR 58-
Kenji Hirosawa and J.F. Le Borgne
No.64
2018 Jan.
PDF
Visual, DSLR and CCD minima of eclipsing binaries during 2017
Kazuo Nagai
No.63
2017 Feb.
PDF
Visual, DSLR and CCD minima of eclipsing binaries during 2016
Kazuo Nagai
No.62
2016 Feb.
PDF
CCD and DSLR maxima of RR Lyrase stars in 2015
Kenji Hirosawa
No.61
2016 Feb.
PDF
Visual, DSLR and CCD minima of eclipsing binaries during 2015
Kazuo Nagai
No.60 2016 Jan.
PDF
New light elements for four Eclipsing Binaries, CW Ori, OT Lac, CR Per and V610 Cyg
Kiyoshi Kasai and Kazuo Nagai
No.59
2015 Jan.
PDF
Visual, DSLR and CCD minima of eclipsing binaries during 2014
Kazuo Nagai
No.58
2015 Jan.
PDF
CCD and DSLR maxima of RR Lyrase stars in 2014
Kenji Hirosawa
No.57
2014 Feb.
PDF
CCD and DSLR maxima of RR Lyrase stars in 2013
Kenji Hirosawa
No.56
2014 Feb.
PDF
Visual and CCD minima of eclipsing binaries during 2013
Kazuo Nagai
Errata for No.55 (2013 Jul.) PDF
No.55
2013 Feb.
PDF
Visual and CCD minima of eclipsing binaries during 2012
Kazuo Nagai
No.54 2013 Feb.
PDF
CCD and DSLR maxima of RR Lyrase stars in 2012
Kenji Hirosawa
No.53
2012 Jan.
PDF
Visual and CCD minima of eclipsing binaries during 2011
Kazuo Nagai
No.52 2012 Jan.
PDF (Rev. 1.1 2012 Jan. 24. Some duplicated entries were deleted.)
Visual and CCD maxima of RR Lyrase stars in 2003 -2011
Kenji Hirosawa
No.51
2011 Feb.
PDF
Visual and CCD minima of eclipsing binaries during 2010
Kazuo Nagai
No.50 2010 Feb.
PDF
Visual and CCD minima of eclipsing binaries during 2009
Kazuo Nagai
No.49 2009 Apr.
PDF
Rebrightening Phenomenon in Classical Novae
Taichi kato, Kazuhiro Nakajima, Hiroyuki Maehara and Seiichiro Kiyota
No.48 2009 Apr.
PDF
Visual and CCD minima of eclipsing binaries during 2008
Kazuo Nagai
No.47 2008 Oct.
PDF
Visual and CCD minima of eclipsing binaries during 1900-1999
Kazuo Nagai
Errata for No.44 (2008 Feb.)
html
No.46 2008 Feb.
PDF
Visual and CCD minima of eclipsing binaries during 2007
Kazuo Nagai
Errata for No.39-44 (2007 Feb.)
html
No.45 2007 Feb.
PDF
Visual and CCD minima of eclipsing binaries during 2006
Kazuo Nagai
No.44 2006 Feb.
PDF
Visual and CCD minima of eclipsing binaries during 2005
Kazuo Nagai
No.43
2005 Feb.
PDF
Visual and CCD minima of eclipsing binaries during 2004
Kazuo Nagai
No.42 2004 Feb.
PDF
Visual and CCD minima of eclipsing binaries during 2003
Kazuo Nagai
No.41 2003 Oct.
PDF
First period determination of V1899 Sgr
Taichi Kato
UW Aqr is a variable star
Taichi Kato
ZZ Aqr is a semiregular variable resembling Z UMa
Taichi Kato
No.40 2003 Feb.
PDF
Visual and CCD minima of eclipsing binaries during 2002
Kazuo Nagai
No.39 2002 Jan.
PDF
Remarkable yellow
supergiant variable TmzV429
Taichi Kato and Kesao Takamizawa
Visual and CCD minima of eclipsing binaries during 2001
Kazuo Nagai
No.38 2001 Jan.
PDF
The overall lightcurve
of the second historical decline of BZ Cam
Tsutomu Watanabe
Visual and CCD minima of eclipsing binaries during 2000
Kazuo Nagai
No.37 2000 Mar.
PDF
Detection of the second
historical decline of BZ Cam
Tsutomu Watanabe
Visual and CCD minima of eclipsing binaries during 1999
Kazuo Nagai
No.35-36 2000 Jan.
PDF
Medium-term variability
of FY Per
Tsutomu Watanabe
Hiroyuki Maehara
Eclipse period of FN Sgr
Tsutomu Watanabe
Period revision of ES Del
Tsutomu Watanabe
No.34 1999 Sep.
PDF
Outburst of BF Eri
Tsutomu Watanabe
Outburst of TmzV34 (= RXJ0915.8+0900)
Tsutomu Watanabe
Outburst of Goranskij's variable near GM Sgr
Tsutomu Watanabe
Detection of the second historical decline of VY-Scl type variable LQ
Peg
Tsutomu Watanabe
No.33 1999 Apr.
PDF
Visual and CCD minima of
eclipsing binaries during 1998
Kazuo Nagai
Detection of an Eclipse during the 1987 Outburst of U Sco
Taichi Kato
No.32 1998 Oct.
PDF
Outburst of RX
J0575.0+6306
Tsutomu Watanabe
Light Curve of SBS1017+533
Tsutomu Watanabe
No.30-31 1998 Aug.
PDF
Outburst of Possible
Eclipsing Symbiotic Variable AS 289
Kesao Takamizawa
Minoru Wakuda
Taichi Kato
22 new variable stars discoverd from patrol films (new variable stars
series III)
Kesao Takamizawa
No.28-29 1998 Apr.
PDF fig.1
12 new variable stars
discoverd from patrol films (new variable stars series II)
Kesao Takamizawa
Visual and CCD minima of eclipsing binaries during 1997
Kazuo Nagai
No.26-27 1997 Dec.
PDF
9 NEW VARIABLE STARS
DISCOVERED FROM PATROL FILMS
Kesao Takamizawa
No.25 1997 Dec.
PDF
Least-Squares Strategy
for Analyzing Pogson's Step Method
Taichi Kato
Reanalysis of Photographic Observations of CY UMa in 1988
Taichi Kato
Prediscovery Photographic Observation of V4334 Sgr (Sakurai's Object)
Kesao Takamizawa
No.24 1997 Dec.
PDF
Resumption of Pulsation
of RU Cam around 1970: Evidence from the VSOLJ Database
Minoru Sato
Reanalysis of Ichinohe's Observations of RU Cam
Taichi Kato
No.23 1997 Oct.
PDF
Visual and CCD minima of eclipsing binaries
during 1995-96
No.22
1996
Sep.
PDF
CCD Observation of nova
Sgr 1994 no.2
Seiichiro Kiyota
CCD Observation of nova Aql 1995
Seiichiro Kiyota
CCD Observations of symbiotic nova discovered by M. Wakuda during
1994-1995
Seiichiro Kiyota
No.21
1995
Dec.
PDF
Possible new MIRA type
variable in Sagittarius
Keiichiro Minoda
Reviced orbital period of IP Peg and possible existence of
superhump-like periodicity during outbursts
T. Kato, M. Iida, S. fujino, M. Yamada, N. makiguchi, K. hirosawa, M.
Ishii
No.20
1995
Aug.
PDF
Photographic Observation of NSV12245, 12376, 12656, 12883 & 13204 by Prof. Huruhata
Seiichi
Sakuma
No.19
1994
Oct.
PDF
Photographic observations of a symbiotic nova 1994 in Sagittarius before discovery
Minoru Wakuda, MInoru Yamamoto and Yukio Sakurai
Visual observation of PG 043+521: A new dwafr nova in the Palomer Green Survey
Makoto
IidaNo.18
1993
May
PDF
Summary of the database of VSOLJ. Part.3 (Ser-Vul, NSV star, Super nova & Var.star in Messier object)
Seiichi Sakuma
No.17
1993
May
PDF
Summary of the database of VSOLJ. Part.2 (Gem-Sct)
Seiichi Sakuma
No.16
1993
May
PDF
Summary of the database of VSOLJ. Part.1 (And-For)
Seiichi Sakuma
No.15
1992
Apr.
PDF
Seach for Mira variables from IRAS Catalogue of Point Sorce
Minari Iida
No.14
1992
Apr.
PDF
A possible new Mira type varoable in Delphinus
Yukio Sakurai
Some new variables in Monoceros
Minoru Wakuda
No.13
1991
May
PDF
Photometry of 32 Cyg and Gamma Per around 1990 Eclipse
T. Izutu, K. Kosaka, M.Magome and T.
Yamasaki
Visual obervations of NSV1020, NSV9887 and NSV14469
Makoto Iida
Faint state of PG0911-066
Taichi KatoNo.12
1990
Jul.
PDF
Late Prof. M. Huruhata's photographic observation of variable starts.
S. SakumaNo.11
1990
Jun. PDF
Revised elements for EH Canis Majoris
M. Koshiro
Possible cataclysmic variable in Cassiopea
M. Iida
Reviced elements for AD Draconis
S. SakumaNo.10
1989
Jun. PDF
AW Gem: A new SU Uma star
S. Fujino and M. Nakai, M. Iida, M. Moriyama, N. Makiguchi
and T. Kato
Recent behavior of CY UMa
M. Watababe, K.Hirosawa, T. Kato and H. NarumiNo.9
1989
Apr. PDF
Detection of superhumps in dwarf nova AQ Eridani
T. Kato, S. Fujino and M. Iida
A new ephemeris of AK Hya
Kazuaki Gimi snd Msami Koshiro
Observation of V362Cep
S. Kiyota
Prof. M. Huruhata in Memorium
No.8
1988
Nov. PDF
Observation of Wakuda's new MIra type variable in Canis Major
M. Yasuki
Suspected variable star near Z Mon by Dr. Ichinohe
S. Sakuma
No.7
1988
Aug. PDF
Photographic obervation of V718 tau
M. HurhataNo.6
1988
Apr. PDF
Recent ephemeris of algol
M. Kanai
Periodicity of GP CMa
M. Huruhata snd M. WakudaNo.5
1988
Feb. PDF
Photographic observations of eclipsing of AS 338
M. Wakuda
CY Ursae Majoris - A new SU UMa system with ultra short orbial period
T. Kato, S. fujino, M. iida, N. makuguchi and M. Koshiro
A possible new MIra type variable in Taurus
M. Huruhata
No.4
1987
Dec. PDF
Some new In variables in Orion nebula
M. Huruhata
Observations of eclipse IP Pegasi
M. Koshiro and S. Fujino
Viaual observations of minima of IP pegasi
M. Iida
Visual oberrvations of VZ Cam
S. Sakuma
No.3
1987
Oct. PDF
Photographic and visual observations of eclipses of EX Hydrae
S. Fujino, K. Fujino, M. Iida and T. Kato
Determination of superhump-period of T. Leonis
T. Kato and S. Fujino
Visual observations of NSV13991
K. Gomi
No.2
1987
Aug. PDF
Observations of the eclipse of IP Peg in 1985
S. Akita, S. Fujino and T. Kato
Obervations of eclipse of IP Peg in 1986
S. Fujino
A New red variable in Cygnus
M. Huruhata
Periodicity of V1152 Cygni
M. Huruhata
No.1
1987
Jun. PDF
Photographic observations of KR Aur in 1985/1986
S. Fujino, M. Huruhata, T. Saito amd M. Wakuda
Perio shortning of SS CMa
M. Koshiro
Visual obervations of PW Vul
M. Watanabe
VSOLJ
Return