(cba:news) (cba:chat) MAXI J1820 = ASASSN-18ey URGENT

[Joe Patterson]

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 at rit.edu 
>> <mailto:mwrsps at rit.edu>> 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 at cbastro.org
>>     <mailto:cba-news-bounces at cbastro.org>] on behalf of Joe Patterson
>>     [jop at astro.columbia.edu <mailto:jop at astro.columbia.edu>]
>>     Sent: Saturday, March 31, 2018 5:57 AM
>>     To: cba-news at cbastro.org <mailto:cba-news at cbastro.org>;
>>     cba-chat at cbastro.org <mailto:cba-chat at cbastro.org>
>>     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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