comet (188617) QN26

• by planetaryscience

  reported by @joinpep in the GZ forum here on 2010/04/02

  identified by me on 2014/07/24 as (188617) QN26

  Awaiting confirmation.

  Field date: 2003/03/30 15:00:00 UT

  No corresponding GZ ID*

  *The comet is on the edge of a field overlapped by another. As a result, the comet has no ID, and attempting to go too close to it on the navigate tool will result in it disappearing.

  Posted July 27, 2014 4:50 PM

• by c_cld in response to planetaryscience's comment.

  The identification of comet posted by @joinpep is

  30P/Reinmuth 1
  Classification: Jupiter-family Comet SPK-ID: 1000070

  shot on mjd_r =52615.50581902 i.e. 2002-12-7 12:8:22.76 at ra= 10:33:16.33 dec=+10:09:11.6

  see post http://www.galaxyzooforum.org/index.php?topic=279947.msg587050#msg587050

  and comet full picture in frame

  http://dr10.sdss3.org/sas/dr10/boss/photoObj/frames/301/3518/6/frame-irg-003518-6-0119.jpg

  

  Posted July 27, 2014 6:01 PM

• by ElisabethB moderator

  Thanks C_cld ! 😄

  Posted July 27, 2014 6:47 PM

• by planetaryscience

  I looked at the field above that that the comet was from and found it to be 2003 03 30, with (188617) 2005 QN26 in the exact location, with the exact direction of the comet. What is the source of your identification as 30P?

  On the observed date you report, the comet would have been magnitude 16, AKA about as bright as the star on the right, above the comet.

  Posted July 28, 2014 2:29 AM

• by c_cld in response to planetaryscience's comment.

  It is well known that the skyserver "explore page" shows only one run of possible many of the thumbnail spot.

  For http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=588017702384304374, it seems that you picked run 3836 rerun 41 camcol 1 field 66 mjd_r 5.2729158E4 2003-03-31 03:47:31.200 UTC without checking if the corresponding frame displayed the comet or not

  As you see below there is no comet in that frame http://skyservice.pha.jhu.edu/DR9/ImgCutout/getjpegcodec.aspx?R=3836&C=1&F=66&Z=50 (in bottom left corner)

  

  It follows that your identification (188617) QN26 is wrong. By the way this object is a very faint asteroid seen twice in SDSS as you could query the SDSS-MOC base ( http://www.astro.washington.edu/users/ivezic/sdssmoc/sdssmoc.html ) .

  What I report is object http://skyserver.sdss3.org/public/en/tools/explore/summary.aspx?id=0x112d0dbec0770094&spec=&apid= which ugriz is

  u g r i z
  16.89 15.36 14.78 14.47 14.27

  below your mag 16 😃

  Posted July 28, 2014 10:28 AM

• by JeanTate in response to planetaryscience's comment.

  To further illustrate, here is a version of the image in joinpep's GZF post, showing the Field boundaries (it's also a bit bigger):

  

  Posted July 28, 2014 1:18 PM

• by planetaryscience

  Well, I'm convinced. Thanks C_cld & JeanTate.

  Posted July 28, 2014 4:45 PM