Stewart John Bean

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Viewing 20 posts - 41 through 60 (of 99 total)
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  • in reply to: CG Dra: a VSS campaign #584394
    Stewart John Bean
    Participant

    Ken Menzies (AAVSO) has helped me upload images with the clear filter as CV into the AAVSO database. All fit with the existing results from other observers so I seem to have done it right. Stewart

    in reply to: ER Uma and RZ Lmi: Observations requested. #584393
    Stewart John Bean
    Participant

    Definitely in outburst and possibly this will trigger the superoutburst. The last superoutburst was recorded, at its brightest at 12.2 visual, by OJR (AAVSO) on 2459339. So we are ~50 days later right now. Could well brighten over the next day or two.

    Stewart 

    in reply to: ER Uma and RZ Lmi: Observations requested. #584386
    Stewart John Bean
    Participant

    ER Uma was at quite dim last night at 15.0 V mag. It is also approaching time for the next superoutburst as the last one started around JD 2459338. With a super outburst period of 55 +_ 5 days, this minimum may be the last before a normal outburst triggers the superoutburst. A few extra observations in the next 5 days could capture the event nicely.

    Thanks in advance.

    Stewart

    in reply to: CG Dra: a VSS campaign #584250
    Stewart John Bean
    Participant

    16.9 V mag on the early morning 20th May. Data is at AAVSO site. Stewart

    in reply to: IX Dra: observations requested #584200
    Stewart John Bean
    Participant

    IX Dra at 14.6 V mag last night (with distinct variations over 15 minutes) which is typical for superoutbursts. Timing is consistent with expectations as described in VSSC 187. Data is at the AAVSO site.

    IX Dra does seem fairly well behaved around its 60.5 days super cycle period.

    in reply to: IX Dra: observations requested #584188
    Stewart John Bean
    Participant

    Only 18.0 V filter last night ( New Mexico AAVSOnet) . Probably the minimum before the superoutburst.

    in reply to: ER Uma and RZ Lmi: Observations requested. #584184
    Stewart John Bean
    Participant

    They look good to me. Variation of about 0.15 mag is about right for superhumps, i think. So it all fits.

    Thanks , Stewart

    in reply to: ER Uma and RZ Lmi: Observations requested. #584180
    Stewart John Bean
    Participant

    Continues to look like a superoutburst. Stewart

    in reply to: ER Uma and RZ Lmi: Observations requested. #584174
    Stewart John Bean
    Participant

    V mag 12.4 and 12.88 would suggest a superoutburst has started about 53 days from the previous start.

    Jose Ripero Osorio (AAVSO) also reports 12.2 on May 4th.

    If anyone can collect time resolved photometry to record super humps that would be good.

    Stewart

     

    in reply to: ER Uma and RZ Lmi: Observations requested. #584166
    Stewart John Bean
    Participant

    ER Uma is expected to start a superoutburst shortly (due date May 5th) so if anyone can help with observations that would be great. ER Uma is a reasonably bright target when in outburst, at about V mag 13, and is high in the sky in the evenings during May. Yesterday it was down at Vmag 15 so that may have been the minimum before a rise to superoutburst.

    Stewart

    in reply to: IX Dra: observations requested #584156
    Stewart John Bean
    Participant

    According to the recent trend of 60 days between superoutbursts, IX Dra is due to start its next outburst on May 9th – give or take a few days. 

    Last night it was at V mag 16.7 and the day before at 17.8 (AAVSO BSM-NM). So it  may have one more normal outburst before the super starts. 

    All contributions welcome to try to capture the time of the next superoutburst.

    Stewart

    in reply to: SN 2021hpr #584078
    Stewart John Bean
    Participant

    Vphot estimates the SN to be at V mag 14.85

    in reply to: SN 2021hpr #584065
    Stewart John Bean
    Participant


    This is an image from 2021-04-09 09:00:20 obtained from New Mexico using iTel 021. 3 x 300 s exposure in V filter. 

    in reply to: ER Uma and RZ Lmi: Observations requested. #583952
    Stewart John Bean
    Participant

    James DeYoung (USA) has uploaded three days of results –  including superhumps  starting at JD 2459285.5. So the outburst seems to have started at JD 2459285 giving a superoutburst period of 55.3 days since the last. This compares to 54.7 days for the previous period. So 55 days seems a good number to use for the next outburst although there may be an increasing trend as shown in the graph.

    The next superoutburst may be around May 5th  give or take a week.

    in reply to: ER Uma and RZ Lmi: Observations requested. #583945
    Stewart John Bean
    Participant

    ER UMa was last reported to be at a low state at 14.8 visual from Hungary. So a superoutburst should happen soon, but, unlike IX Dra , each period varies by upto +_ 7 days from the last. Observations would be most welcome in the next week – howling gales permitting.

    The stream of AAVSOnet images I have relied upon for ER Uma, IX Dra and RZ Lmi ( all UGER stars) has paused for some reason.

    Thanks in advance

    Stewart

    in reply to: IX Dra: observations requested #583944
    Stewart John Bean
    Participant

    Nick, Excellent. I think your observation caught it on the rise to the outburst.  

    This fits with the recent average period between superoutbursts of 60.5 days.

    Stewart

    in reply to: IX Dra: observations requested #583938
    Stewart John Bean
    Participant

    Gary Poyner notes that Yutaka Maeda (Nagasaki, Japan)  has reported the following:

    DRA IX    2021 03 10.74591     146:c    Mdy.VSOLJ    outburst

    I also just had 14.7 Vmag at 2021/03/11 11:26:17  from itel T11. This compares with 14.5 Vmag for the two previous superoutbursts so most probably a superoutburst.

    If anyone has observations for the last few days they could help firm up on the time of the super-outburst’s start.

    Stewart

    in reply to: ER Uma and RZ Lmi: Observations requested. #583925
    Stewart John Bean
    Participant

    In the next two weeks ER Uma will probably start a new superoutburst. This is based upon a superoutburst period of 55+/-5 days.

    A graph of the superoutburst period against supercycle number is further up the thread – which shows this star “wanders” around 50 or 55 days for the super cycle period. 

    ER Uma is a good target in the spring. Observations are encouraged.

    Stewart

    in reply to: IX Dra: observations requested #583910
    Stewart John Bean
    Participant

    IX Dra is approaching its March superoutburst. Based upon the current superoutburst period of around 60.5 days ( as described in VSSC 187) March 11 seems to be a likely start date. Yesterday IX Dra was at 17.4 V mag (AAVSOnet New Mexico) having risen from its quiescence low brightness of 18.0. It is possible there will be one more normal outburst and then the superoutburst as the time between outbursts is usually 5-6 days.

    IX Dra is really a morning star at present, but is about 40 deg above the horizon at midnight in the UK.

    Observations would be welcome over the next two weeks in order to determine the start of the superoutburst within a day.

    Thanks in advance

    Stewart Bean

    in reply to: ER Uma and RZ Lmi: Observations requested. #583730
    Stewart John Bean
    Participant

    ER Uma probably in superoutburst at mag 12.6 V at 2021/01/17 04:44:36.

Viewing 20 posts - 41 through 60 (of 99 total)