Fwd: Big Centaur occultation of a bright star (night 30/April - 01/May)

[Felipe Braga Ribas]

Dear colleagues,

the big centaur object 1998BU48 will occult a bright star tomorrow night (30/April to 01/May). The star has visual magnitude G = 9.8 and the event may last ~13 seconds. The bad news is that its orbit is not well known, so the prediction error bar is very large. 

So, if you can give it a try at this event we may have a good surprise.

More information can be found in the attached map and in this link:

http://lesia.obspm.fr/lucky-star/occ.php?p=16436

Please let us know if we can be of any help, and let us know too if you do observe.

Felipe.

[Felipe Braga Ribas]

Segue mensagem do Alexandre Amorim sobre a variabilidade da estrela. Vejam que a magnitude G se refere àquela dada pelo Gaia, que é similar a magnitude visual.

Att

---------- Forwarded message ---------
De: Alexandre Amorim <cost...@yahoo.com>
Date: ter, 30 de abr de 2019 às 14:21
Subject: Re: Fwd: Big Centaur occultation of a bright star (night 30/April - 01/May)
To: <felipe...@gmail.com>

Prezados colegas,

Localizei visualmente a estrela na noite de 29-30 de abril e notei que sua magnitude visual é em torno de 11,5 (usando comps do catálogo Tycho-2).

Outras identificações da estrela são:

GSC 868-37

ASAS 115517+1123.9

Na base de dados do ASAS3, a magnitude V da estrela é 11,4 e sua curva de luz sugere uma variação em cerca de 0,3 magnitudes.
http://www.astrouw.edu.pl/cgi-asas/asas_variable/115517+1123.9,asas3,0,0,500,0,0


-
  Conheça de antemão os eventos celestes do ano
 "Anuário Astronômico Catarinense 2019"
      http://www.geocities.ws/costeira1

--------------------------------------------
Em seg, 29/4/19, Felipe Braga Ribas <felipe...@gmail.com> escreveu:

 Assunto: Fwd: Big Centaur occultation of a bright star (night 30/April - 01/May)
 Para: "ocultacoes" <ocult...@googlegroups.com>
 Data: Segunda-feira, 29 de Abril de 2019, 12:39

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[Felipe Braga Ribas]

Dear colleagues,

this campaign had a very good repercussion and you were numerous to reply, observe and send a report. For sure the brightness of the star was the main cause of the good response, but this shows the power of our group!

For now, no one has reported a positive observation but I have no news from North America. I think that Rodrigo Leiva does have.

Rodrigo was anyone successful in the USA or Central America?

Cheers,

Felipe.