Sat, 12/16/2017 - 11:44
hi everybody
4 days ago i was photograpohing phaethon 3200 in perseus.in one of my pics after imposing my pics in www.worldwidetelescope.org i noticed a bright star that was not in map in this site.
it is star UCAC4-678-027043 (RA:04 14 11 DEC:+45 27 30)
It has been from mag 14.5 but in my picture it is almost 10.5 in attached pics you can see it.
this star is not in variable stars list in perseus in aavso.
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Michel
I'll try tonight.
Michel
thanks
I was looking to the area but I saw nothing brillant than 11.6. However I was not 100% sure about the checked position because of the difference between Precession epoch 2000.0 and now.
Michel
I used the plate solver in AstroArt.
The V magnitude of UCAC4-678-027043 is greater than 11.3
snapshot no 2 is correct..its mag is 14.8.
in my new photo its mag is same 14.8.
i think it has faded out (after outburst?)to initial magnitude.
these are my 2 pictures from star location and brightness.first night was 2017,12.12 and second 12.16
Hello,
I took the liberty of downloading your .fits file from astrometry.net. I measured the position of your transient to be 04h14m11.07s +45d27m37.55s (J2000), with an uncertainty of +/- 0.45 arcsec (the average residual of the five bright UCAC4 stars in the field of view). This position is offset with respect to the UCAC4 star that you identified by 8.2 arcsec. Given the comparatively low uncertainty on the measured position, I don't think that your transient is that UCAC4 star. Moreover, Vizier does not contain any objects near the position that I measured, so if it were an outburst of a variable star, there are no known candidate progenitors. I also looked at the full ASAS-SN light curve for the star that you identified, and I saw no obvious variability.
However, MPChecker shows that (3200) Phaethon was very close to the position of your transient around 2017 12 12.87 UT. Its predicted V magnitude was 10.9, so it would have been about as bright as your transient. Its exact equatorial coordinates would depend on the exact time of observation and on your location on Earth. Furthermore, Phaethon was speeding along at over 17 arcmin per hour that night, so its position was changing very rapidly. Thus, it makes sense that it would be gone in subsequent images of this field.
Are you certain that this isn't Phaethon?
Best,
Colin
hi
YES.yes you are right.today i cheked my pictures that i captured that night.
really that night i was attemping to capture phaethon3200 it was successfull of course .when i compare my pictures(with phaethon in it)today i noticed that your suggestion is OK.
thanks