Galaxy Zoo Talk

Three binary systems?

  • RichardHB by RichardHB

    Hello,
    I was observing galaxies and by surprise found this beautiful image.

    Binary systems?

    1. (http://skyserver.sdss.org/dr9/en/tools/chart/navi.asp?ra=181.54413062&dec=-0.05476124)

    Posted

  • NGC3314 by NGC3314 scientist

    The strong colors in each pair suggested an asteroid (since they move slightly in the time between the SDSS telescope sweeping across them in different filters). Indeed, this is a wild coincidence of three asteroids (if I have this right, numbers 30591, 33506, and 63628) - they are not there on the Pan-STARRS images from much later. If you have the date of observation (from the FITS header or image-tag data), you can check for known asteroids near a position using http://cgi.minorplanetcenter.net/cgi-bin/checkmp.cgi

    Posted

  • RichardHB by RichardHB in response to NGC3314's comment.

    Hello.

    Thanks for the info. Checking the link you shared me. I found the following objects nearby:

    ----------- 2016 SO23
    (450717) -- 2007 DC35
    (82799) --2001 QF26
    (240968) --2006 JY3

    Thanks a lot

    Posted

  • c_cld by c_cld

    Asteroids in group on 1999-03-22 07:10:18.252 UTC (from Field table entry mjd_r 51259.29882236)

    GM23 1237648721231413460

    https://ssd.jpl.nasa.gov/sbfind.cgi?

    Current Settings

Observation Time [change] : 

1999-03-22 07:10 UT

Observer Location [change] : 

Apache Point-Sloan Digital Sky Survey [645] ( 254°10'45.9''E, 32°46'49.8''N, 2791.2 m )

Search Region [change] : 

Center at (R.A.=12:06:10, Dec.=-00 03 17), Width=(0:01 x 0 01) dms

Observer Constraints [change] : 

Mag. Limit=19.5, Require Mag. Param's.=yes, Two-Pass=yes, Max. Output=10

Number of objects found: 3

*****************  SBFIND v2.7-linF95     *****************

Observation Date = 1999-Mar-22 07:09:59 (2451259.798611 UT)

 Location = Apache Pt.-Sloan Digital Sky Survey

Center R.A., Dec. = 12:06:10, -00 03'17" (Apparent)

 Offsets (+/-) = 00:01:00, +00 01'00" 

  Magnitude Limit = 19.5

  Magnitude Req. =  true 

 Requested Group =  all asteroids and comets

                                    Apparent                  Dist. from Center
                                    R.A.        Dec.       R.A.  Dec.  Norm  Vmag
  IAU# Object Name              hh:mm:ss.ss +dd mm'ss.s"    (s)   (")   (")
------ -----------------------  ------------------------  -----------------  -----
 30591 2001 QG10                12:06:08.03 -00 03'20.7"  -1.97 -3.74 29.75  18.2 
 33506 1999 GM23                12:06:10.06 -00 02'58.1"   .061  18.9 18.88  16.7 
 63628 2001 QN80                12:06:08.77 -00 03'04.9"  -1.23  12.1 22.14  18.7

    Posted

  • c_cld by c_cld

    30591 2001 QG10

    33506 1999 GM23

    63628 2001 QN80

    Posted

  • RichardHB by RichardHB

    Thank you so much for sharing it.

    Interesting information. I will review it in detail. How do I find the date of the image?

    Thanks again.

    Posted

  • c_cld by c_cld

    http://www.galaxyzooforum.org/index.php?topic=272749.0

    Dating SDSS Images

    From the SkyServer Object Explorer page for the object in question, click on the “Field” link on the left under the “PhotoObj” heading. Scroll down to the “mjd_r” label (r waveband=green color) and note down the value in the right-hand field. This is in MJD format (Modified Julian Date). Now enter this value into the “Modified Julian Day (ddddd.ddd...)” field on the following web site and click the "convert button" to get your date.

    Link: A Date/Time Conversion Utility https://heasarc.gsfc.nasa.gov/cgi-bin/Tools/xTime/xTime.pl

    Posted