February 2023 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16969] CSS J091017.4-200812: AM CVn-type superoutburst
by Taichi Kato 21 Feb '23

21 Feb '23

CSS J091017.4-200812: AM CVn-type superoutburst Berto Monard has reported observations. Based on a single-night run, superhumps with a period of 0.0205(1) d and amplitude of 0.07 mag were detected.

1 0

[vsnet-campaign-dn 16967] BE Oct superoutburst
by Taichi Kato 20 Feb '23

20 Feb '23

BE Oct superoutburst YYYYMMDD(UT) mag observer 20230214.505 163 (Rod Stubbings) 20230218.453 156 (Rod Stubbings) 20230219.473 158 (Rod Stubbings)

1 0

[vsnet-campaign-dn 16966] V392 Hya standstill
by Taichi Kato 20 Feb '23

20 Feb '23

V392 Hya standstill YYYYMMDD(UT) mag observer 20230105.2652 15.041o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230105.2872 15.018o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230105.2899 15.030o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230105.2949 15.031o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230107.0476 14.727o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230107.0496 14.741o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230107.0528 14.739o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230107.0628 14.723o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230107.8663 148C (Masayuki Moriyama) 20230108.0163 14.748o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230108.0181 14.717o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230108.0210 14.724o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230108.0283 14.724o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230108.589 145 (Rod Stubbings) 20230109.2903 14.695o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230109.2934 14.696o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230109.2965 14.702o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230109.3021 14.710o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230113.3260 15.05C (Masao Funada) 20230113.581 148 (Rod Stubbings) 20230114.571 150 (Rod Stubbings) 20230120.574 148 (Rod Stubbings) 20230120.8603 150C (Masayuki Moriyama) 20230122.594 148 (Rod Stubbings) 20230127.274 15.18C (Gary Poyner) 20230127.2760 15.37cG (Masao Funada) 20230127.608 150 (Rod Stubbings) 20230131.556 148 (Rod Stubbings) 20230208.0624 15.09C (Masao Funada) 20230208.062 15.14C (Gary Poyner) 20230210.499 148 (Rod Stubbings) 20230213.533 149 (Rod Stubbings) 20230214.533 148 (Rod Stubbings) 20230217.176 15.04C (Gary Poyner) 20230217.1786 15.17cG (Masao Funada) 20230219.492 148 (Rod Stubbings)

1 0

[vsnet-campaign-dn 16965] MGAB-V300 outburst (suspected AM CVn)
by Taichi Kato 20 Feb '23

20 Feb '23

MGAB-V300 outburst (suspected AM CVn) YYYYMMDD(UT) mag observer 20230218.5603 15.430zr (ZTF Alert DC mag (Masci+ 2019)) 20230218.5627 15.369zr (ZTF Alert DC mag (Masci+ 2019)) 20230218.5652 15.425zr (ZTF Alert DC mag (Masci+ 2019))

1 0

[vsnet-campaign-dn 16964] Gaia23atn
by Taichi Kato 20 Feb '23

20 Feb '23

Gaia23atn Gaia23atn AT2023cgz 2023-02-17 23:48:25 343.95057 46.56566 14.67 unknown 2023-02-19 16:26:35 Transient on very faint PanSTARRS source http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23atn/ Not seen in outburst in the past ATLAS and ZTF data.

1 0

[vsnet-campaign-dn 16963] ASASSN-23ax: new SU UMa-type dwarf nova
by Taichi Kato 20 Feb '23

20 Feb '23

ASASSN-23ax: new SU UMa-type dwarf nova Josch Hambsch has reported observations. Superhumps with a period of 0.0545(2) d (allowing aliases) were detected (0.2 mag).

1 0

[vsnet-campaign-dn 16962] ASASSN-23af: oscillations during long rebrightening
by Taichi Kato 20 Feb '23

20 Feb '23

ASASSN-23af: oscillations during long rebrightening Josch Hambsch has reported further observations. At least three peaks (reaching 15 mag) have been detected during the long rebrightening.

1 0

[vsnet-campaign-dn 16961] CSSJ091017.4-200812 superoutburst (AM CVn)
by Taichi Kato 19 Feb '23

19 Feb '23

CSSJ091017.4-200812 superoutburst (AM CVn) The last recorded one in 2019. No superhump observations yet. YYYYMMDD(UT) mag observer 20230209.9779 19.079o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230210.6977 <163C (Masayuki Moriyama) 20230214.9575 14.685o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230214.9629 14.692o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230214.9667 14.671o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230214.9790 14.696o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1323 14.603c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1350 14.597c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1381 14.619c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1613 14.617c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230217.2965 14.846zr (ZTF Alert DC mag (Masci+ 2019))

1 0

[vsnet-campaign-dn 16960] Re: Yamamoto-san's object = CX137 = CXO GBSJ175553.2-281633 = OGLE-BLG-ELL-12042
by Taichi Kato 19 Feb '23

19 Feb '23

> My correct location data is below. > RA 17 55 53.29 > Dec -28 16 34.1 Sorry, I copied the location of CX137 by mistake.

1 0

[vsnet-campaign-dn 16959] Yamamoto-san's object = CX137 = CXO GBSJ175553.2-281633 = OGLE-BLG-ELL-12042
by Taichi Kato 19 Feb '23

19 Feb '23

Yamamoto-san's object = CX137 = CXO GBSJ175553.2-281633 = OGLE-BLG-ELL-12042 Itoh-san's refined astrometry: RA 17 55 53.262 DEC -28 16 33.96 The location agrees with that of CX137. This is an outburst from a 0.4-d binary with prominent ellipsoidal variations. CX137: 175553.262 -281633.96 (2000.0) Gaia_EDR3_4062657359687091584 plx=1.130(0.049) dismod=9.7 pmra=1.164(0.052) pmdec=-6.889(0.035) G=16.223 BP=16.755 RP=15.373 Yamamoto-san reported that it had brightened further in the ASAS-SN data. https://asas-sn.osu.edu/sky-patrol/coordinate/b4aa63c1-fb92-40c0-96d4-2989b… Itoh-san obtained a short time-resolved photometric run (around 12.7 mag). This object may be eclipsing and further observations are recommended.

2 1