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Re: (cba:news) (cba:chat) MAXI J1820 = ASASSN-18ey URGENT (Joe Patterson) [2018-03-31T11:32:27Z]


Still dark on the West Coast, and later in AU/NZ, when the HST will still be observing.  Of course, simultaneous observations are pure gold.  "Contemporaneous" (close in time) observations are mighty good too.  We don't know much about periods in this star, but short integrations are preferred if you have experience with them.  There is merit in both unfiltered observation (better S/N) and filtered (so it can be put on a flux versus wavelength curve).

joe




On 3/31/2018 7:18 AM, Geoff Stone wrote:

I just took a few shots and am seeing 11.9 - 12.12

Geoff


On 3/31/2018 3:57 AM, Joe Ulowetz wrote:
My conditions weren't great tonight, but I measured between 11.9 and 12.3 from 2458208.82 - 208.87

-Joe U.

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On Sat, Mar 31, 2018 at 5:25 AM, Michael Richmond <mwrsps@xxxxxxx <mailto:mwrsps@xxxxxxx>> wrote:


      I've been making measurements of the object over the
    past three hours: JD 2458208.78 - 208.90.  During this period,
    the variable has been pretty steady at V = 12.1-12.0, with
    short-term fluctuations.

                  MWR

    ________________________________________
    From: cba-news [cba-news-bounces@xxxxxxxxxxx
    <mailto:cba-news-bounces@xxxxxxxxxxx>] on behalf of Joe Patterson
    [jop@xxxxxxxxxxxxxxxxxx <mailto:jop@xxxxxxxxxxxxxxxxxx>]
    Sent: Saturday, March 31, 2018 5:57 AM
    To: cba-news@xxxxxxxxxxx <mailto:cba-news@xxxxxxxxxxx>;
    cba-chat@xxxxxxxxxxx <mailto:cba-chat@xxxxxxxxxxx>
    Subject: (cba:news) MAXI J1820 = ASASSN-18ey URGENT

    Hi CBAers,

    Can you immediately send any data - just a snapshot magnitude
    would be
    great - you have gathered on this star in the last two days?  And
    if you
    don't have any, can you immediately get one.  Just one magnitude
    would
    be great!  The HST observation window is imminent, and the
    brightness is
    critical to pass the test for observation (a go/no-go).

    joe p

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