Galaxy Zoo Talk

Finally, I identified an asteroid

  • Budgieye by Budgieye moderator

    Using c_cld's post as a check, I finally got one. Finally..... I think I was using too small a search area for my previous searches.

    [ EDIT: it seems that I didn't get the same one that c_cld got. Oh well. Will try again]

    NASA: Small Body Identification http://ssd.jpl.nasa.gov/sbfind.cgi This tool provides a list of small-bodies only (asteroids and/or comets) which are likely contained in the specified field on the specified date/time.

    Asteroid description http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007 MB24

    Field of SDSS http://skyserver.sdss.org/dr8/en/tools/explore/ex_sql.asp?cmd=select+*+from+Field+where+fieldId=0x112d1026c0e60000&name=Field&tab=V

    Date of green image mjd_r 5.29091759E4 or 52909.1759

    Modified Julian Date converter http://pdc.ro.nu/mjd.cgi


    EDIT I have deleted the rest of this post because I got the date wrong.

    Posted

  • Budgieye by Budgieye moderator

    Trying to find the same as c-cld found. These asteroids are slippery objects!

    asteroid 22771 (1999 CU3) Classification: Apollo [NEO] mjd_r 5.29091759E4 2003-9-27:4:13:16.598


    EDIT: I have deleted the rest of the post because I got the date wrong.

    Posted

  • c_cld by c_cld

    Ephemeris / WWW_USER Pasadena, USA / Horizons


    Target body name: 22771 (1999 CU3) {source: JPL#359}

    Center body name: Earth (399) {source: DE431}

    Center-site name: Apache Pt.-Sloan Digital Sky Survey


    Start time : A.D. 2003-Sep-27 04:13:00.0000 UT

    Stop time : A.D. 2003-Sep-27 04:21:00.0000 UT

    Step-size : 2 minutes


    Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC APmag delta deldot S-O-T /r S-T-O


    $$SOE

    2003-Sep-27 04:13 23 00 37.60 +64 02 30.5 14.15 0.10565491478584 11.7733133 115.9952 /T 58.8321

    2003-Sep-27 04:15 23 00 38.00 +64 02 16.1 14.15 0.10566435899078 11.7753481 115.9996 /T 58.8275

    2003-Sep-27 04:17 23 00 38.39 +64 02 01.7 14.15 0.10567380482995 11.7773881 116.0039 /T 58.8229

    2003-Sep-27 04:19 23 00 38.79 +64 01 47.3 14.15 0.10568325230753 11.7794333 116.0083 /T 58.8184

    2003-Sep-27 04:21 23 00 39.18 +64 01 32.8 14.15 0.10569270142761 11.7814836 116.0126 /T 58.8138

    $$EOE


    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    rrrrrrHAAAAAA what the....

    2003-09-27 04:13 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.=23:00:37, Dec.=64 02 34 J2000), Width=(0:06 x 0 06) dms
    Observer Constraints [change] : Require Mag. Param's.=yes, Two-Pass=yes, Max. Output=20
    Number of objects found: 1

    ***************** SBFIND v2.7-linF95 2016-Apr-22 13:19:54 *****************

    Observation Date = 2003-Sep-27 04:12:59 (2452909.675694 UT)
    Location = Apache Pt.-Sloan Digital Sky Survey
    Center R.A., Dec. = 23:00:37, +64 02'34" (J2000)
    Offsets (+/-) = 00:06:00, +00 06'00"
    Magnitude Limit = (none)
    Magnitude Req. = true
    Requested Group = all asteroids and comets

                                J2000                     Dist. from Center
                                    R.A.        Dec.       R.A.  Dec.  Norm  Vmag
    

    IAU# Object Name hh:mm:ss.ss +dd mm'ss.s" (s) (") (")


       2015 CC14                22:56:29.35 +64 01'57.7"  -248. -36.3 3715.  21.6 
    
    • "Vmag" is the estimated visual magnitude (n.a. = not available).
      For comets, tailing "N"=nuclear and "T"=total magnitude.

    2015 CC14 Amor [NEO]

    http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015 CC14

    Seriously confused now, what is wrong with the query in the JPL SSD?


    @c_cld: would you be so kind to post the complete SQL query code for mjdtoGMT from field?

    Thanks

    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    2003-09-27 04:13 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.=23:00:37.5, Dec.=64 02 33.86), Width=(0:30 x 0 30) dms
    Observer Constraints [change] : Require Mag. Param's.=yes, Two-Pass=yes, Max. Output=20
    Number of objects found: 4

    ***************** SBFIND v2.7-linF95 2016-Apr-22 14:33:33 *****************

    Observation Date = 2003-Sep-27 04:12:59 (2452909.675694 UT)
    Location = Apache Pt.-Sloan Digital Sky Survey
    Center R.A., Dec. = 23:00:38, +64 02'34" (Apparent)
    Offsets (+/-) = 00:30:00, +00 30'00"
    Magnitude Limit = (none)
    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) (") (")


       22771 1999 CU3       23:00:47.63 +64 03'45.1"   10.1  71.2 167.8  14.1 
       2007 LS19                23:23:44.17 +64 01'33.8"   1.E3 -60.1 2.1E4  23.5 
       2014 YH44                23:18:16.76 +64 21'27.1"   1.E3  1.E3 1.6E4  21.5 
       2015 CC14                22:56:39.28 +64 03'12.1"  -238.  38.3 3574.  21.6 
    

    So with a wider search area (00:30 00 30) i get an asteroid that is closer to the give date, time and RA dec as center than with a smaller search area....

    Nuts.

    Posted

  • Budgieye by Budgieye moderator

    Congratulations Ghost_Sheep_SWR '

    I must use the Gregorian calendar --- which I should have known!

    Calendar Conversion tool http://pdc.ro.nu/mjd.cgi

    2003 09 27 at 4:13


    c-cld's date and time

    5.29091759E4

    2003-9-27 4:13 16.598


    Ok, now I've got the date correct.


    SB Identification
    This tool provides a list of small-bodies only (asteroids and/or comets) which are likely contained in the specified field on the specified date/time.
    Current Settings

    Observation Time [change] : 2003-09-27 04:13 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.=23:00:37, Dec.=64 02 34), Width=(00:30:00 x 00 30 00) dms

    Observer Constraints [change] : Mag. Limit=20, Require Mag. Param's.=yes, Max. Output=20

    Number of objects found: 23 ( showing only first 20 )

    ***************** SBFIND v2.7-linF95 2016-Apr-23 01:06:27 *****************

    Observation Date = 2003-Sep-27 04:12:59 (2452909.675694 UT)

    Location = Apache Pt.-Sloan Digital Sky Survey

    Center R.A., Dec. = 23:00:37, +64 02'34" (Apparent)
    Offsets (+/-) = 00:30:00, +00 30'00"
    Magnitude Limit = 20.0
    Magnitude Req. = true
    Requested Group = all asteroids and comets

                                     Apparent        Dist. from Center         Est. Errors
                                  R.A.      Dec.      R.A.  Dec.  Norm  Vmag    R.A.  Dec.
    

    IAU# Object Name hh:mm:ss +dd mm'ss" (s) (") (") (s) (")


       20826 2000 UV13           01:04:47 +35 02'51"   7.E3 -1.E5 1.5E5  19.5  8332. 1.2E5
    
       22771 1999 CU3            22:00:57 +62 13'36"  -4.E3 -7.E3 5.4E4  14.0  2027. 3.0E4
    
       101430 1998 VE32          22:22:24 +61 12'51"  -2.E3 -1.E4 3.6E4  16.3  647.6 9714.
    
       137924 2000 BD19          11:28:19 +03 41'58"  -4.E4 -2.E5 6.6E5  18.3  6.2E4 9.3E5
    
       143637 2003 LP6           12:26:26 +13 36'02"  -4.E4 -2.E5 6.0E5  19.2  7.2E4 1.1E6
    
       225416 1999 YC           04:25:41 -41 37'45"   2.E4 -4.E5 4.8E5  19.4  3.3E4 5.0E5
    
       306517 1999 WY           23:26:14 +64 56'33"   2.E3  3.E3 2.3E4  16.3  1040. 1.6E4
    
       374158 2004 UL           22:51:59 -61 54'34"  -518. -5.E5 4.5E5  19.8  1.5E5 2.2E6
    
       1991 TB2                 12:43:34 -08 07'08"  -4.E4 -3.E5 6.1E5  17.9  3.8E4 5.7E5
    
       2012 WA25                00:02:54 +55 46'04"   4.E3 -3.E4 6.3E4  19.4  3095. 4.6E4
    
       1927 LA                  00:54:21 +05 38'36"   7.E3 -2.E5 2.3E5  17.1  2.4E5 3.6E6
    
       1939 RR                  18:22:16 -29 49'17"  -2.E4 -3.E5 4.2E5  17.3  1.3E5 2.0E6
    
       1942 RH                  21:57:36 -07 00'35"  -4.E3 -3.E5 2.6E5  16.2  9.4E4 1.4E6
    
       1981 EO47                01:40:17 +06 11'22"   1.E4 -2.E5 2.5E5  18.0  1.6E4 2.4E5
    
       2012 US136               12:16:18 -07 45'02"  -4.E4 -3.E5 6.3E5  16.6  2.0E5 2.9E6
    
       2013 LH25                07:53:28 -10 15'00"   3.E4 -3.E5 5.5E5  19.4  6.1E4 9.2E5
    
       2014 MS17                00:24:45 +64 46'18"   5.E3  3.E3 7.6E4  19.1  5094. 7.6E4
    
       1168 T-2                 22:33:01 -14 57'18"  -2.E3 -3.E5 2.9E5  19.9  3.0E4 4.5E5
    
       2P (Encke)               02:28:39 +33 47'54"   1.E4 -1.E5 2.2E5  19.8  1.9E4 2.9E5
    
       322P (SOHO)              12:25:53 -04 06'04"  -4.E4 -2.E5 6.2E5  17.5  1.3E5 1.9E6
    

    Well, now I have the asteroid to be second on the list. But why are there so many objects from so many places?


    It worked this time, I just listed one asteroid, and the correct one this time.

    I'm not sure what was different. Something in the widths parameters

    I used w00:30:00 and w00 30 00

    Input

    Width=(00:30:00 x 00 30 00) dms before

    Width=(00:30:00 x 00 30 00) dms correct

    Output

    Offsets (+/-) = 00:30:00, +00 30'00" before

    Offsets (+/-) = 00:30:00, +00 30'00" correct

    I can't see any difference.


    Current Settings

    Observation Time [change] : 2003-09-27 04:13 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.=23:00:37, Dec.=64 02 34), Width=(00:30:00 x 00 30 00) dms

    Observer Constraints [change] : Mag. Limit=20, Require Mag. Param's.=yes, Two-Pass=yes, Max. Output=20

    Number of objects found: 1

    ***************** SBFIND v2.7-linF95 2016-Apr-23 01:46:29 *****************

    Observation Date = 2003-Sep-27 04:12:59 (2452909.675694 UT)

    Location = Apache Pt.-Sloan Digital Sky Survey

    Center R.A., Dec. = 23:00:37, +64 02'34" (Apparent)
    Offsets (+/-) = 00:30:00, +00 30'00"

    Magnitude Limit = 20.0

    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) (") (")


        22771 1999 CU3                 23:00:47.63 +64 03'45.1"   10.6  71.1 174.6  14.1 
    


    Well that took a long time. I am obviously not talented at this. If I have so much trouble with a bright one, I'll have trouble with the dim ones.



    The calendar lesson

    While any event in recorded human history can be written as a positive
    Julian day number, when working with contemporary events all those
    digits can be cumbersome. A Modified Julian Day (MJD) is created by
    subtracting 2400000.5 from a Julian day number, and thus represents
    the number of days elapsed since midnight (00:00) Universal Time on
    November 17, 1858. Modified Julian Days are widely used to specify the
    epoch in tables of orbital elements of artificial Earth satellites.
    Since no such objects existed prior to October 4, 1957, all
    satellite-related MJDs are positive.

    https://www.fourmilab.ch/documents/calendar/


    The History Lesson

    (Julian calendar to Gregorian calendar "Give us our Eleven Days" https://en.wikipedia.org/wiki/Calendar_(New_Style)_Act_1750

    Posted

  • c_cld by c_cld in response to Ghost_Sheep_SWR's comment.

    My query was complete:

    Your SQL command was:

    select dbo.fMjdToGMT(mjd_r) from field where fieldID=1237663231227854848

    2003-9-27:4:13:16.598053

    You could use also SDSS Object ID

    Your SQL command was:

    select p.objid, f.mjd_r, dbo.fMjdToGMT(f.mjd_r) as dateobs from phototag p join field f on p.fieldid=f.fieldid where objID=1237663231227855407

    objid mjd_r dateobs

    1237663231227855407 52909.1758865599 2003-9-27:4:13:16.598053

    Posted

  • c_cld by c_cld in response to Ghost_Sheep_SWR's comment.

    22771 1999 CU3 22771 1999 CU3

    http://classic.sdss.org/dr3/instruments/index.html "each object has one image in each filter, taken at 71.7 second intervals"

    ~45arcsec track in 71.7*4(r,i,u,z)+54(g) seconds =340.8s = ~5mn41s

    Posted

  • Budgieye by Budgieye moderator

    Pretty image, c_cld! The asteroid is going south, unlike the usual asteroid that goes E or W. So I assume it passed beneath (over?) the south pole at a distance of approximately 10 million miles in 2003.

    date ...............distance in Astronomical Units AU

    2001-Sep-25 11:17 Earth 0.11

    2003-Sep-17 14:42 Earth 0.06

    2005-Sep-03 18:37 Earth 0.14

    2007-Aug-14 08:16 Earth 0.22 2007-Jul-21 08:46 Venus 0.140

    2009-Jul-22 23:52 Earth 0.28

    2011-Jul-02 10:29 Earth 0.30

    2013-Jun-08 22:49 Earth 0.29

    2015-May-07 19:54 Earth 0.24

    2017-Apr-19 15:26 Earth 0.16

    from http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=22771;old=0;orb=0;cov=0;log=0;cad=1#cad

    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR in response to c_cld's comment.

    Thanks c_cld!

    By the way, can you tell the difference in the query from Budgieye? I really don't see any difference, a bit worrysome if you want to know how to get the right results.

    Well succes at last Budgieye 😃 , this is more complicated than i imagined it to be


    EDIT

    Great it worked 😃 (visually works better for me)

    enter image description here

    2003-9-27:4:13:16.598053

    Posted

  • c_cld by c_cld in response to Budgieye's comment.

    So I assume it passed beneath (over?) the south pole at a distance of approximately 10 million miles in 2003.

    No, declination is positive, that's above the celestial equator .

    Ephemeris were

    Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC APmag

    2003-Aug-23 04:13 11 34 04.72 -09 37 28.0 20.

    2003-Aug-28 04:13 11 38 12.48 -06 50 35.6 21.

    2003-Sep-02 04:13 m 11 42 09.46 -01 44 11.1 23.

    2003-Sep-07 04:13 m 11 46 49.99 +07 43 23.6 26. Ned Output: Ecliptic J2000.0 longitude 31.05349557 latitude 60.40342057 (north of ecliptic)

    2003-Sep-12 04:13 m 11 54 50.15 +26 09 49.7 21.

    2003-Sep-17 04:13 12 20 01.14 +59 06 59.5 15.61

    2003-Sep-22 04:13 20 28 17.32 +83 01 12.4 14.10

    2003-Sep-27 04:13 23 00 37.60 +64 02 30.5 14.15

    2003-Oct-02 04:13 m 23 16 47.21 +52 51 08.6 14.51

    2003-Oct-07 04:13 m 23 23 43.61 +45 59 49.0 14.93

    so nearly above north earth pole within ~6.056 million miles (Wolfram convert 0.0651529 au (astronomical units) to miles) or 9.75 million km (24 times earth moon distance)

    Posted

  • c_cld by c_cld in response to Ghost_Sheep_SWR's comment.

    You could prefer the shortest query

    Your SQL command was:
    select dbo.fMjdToGMT(52909.1758865599) or select dbo.fMjdToGMT(5.29091758865599E4)

    2003-9-27:4:13:16.598053

    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    That's really short&handy for SDSS, works like a charm!

    Do you happen to know of a similar SQL command for converting RA,dec Decimal to Hexagesimal units (for DECaLS asteroid identification)?

    I now use the Hubble Legacy Archive to convert these for me

    http://hla.stsci.edu/hlaview.html

    It's a bit of a circumbendibus and slow-down method i think.

    Posted

  • c_cld by c_cld

    I'm using mostly
    Coordinate Converter: http://heasarc.gsfc.nasa.gov/cgi-bin/Tools/convcoord/convcoord.pl?

    and sometimes xTime - A Date/Time Conversion Utility http://heasarc.gsfc.nasa.gov/cgi-bin/Tools/xTime/xTime.pl

    Posted

  • c_cld by c_cld

    Decimal to sexagesimal

    Your SQL command was:

    select dbo.fHMS(345.15675) as ra, dbo.fDMS(64.04172) as dec

    ra dec

    23:00:37.62 +64:02:30.19

    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR in response to c_cld's comment.

    Thanks! Those are very handy 😃


    Just having a lot of fun now trying to find objects for the WOW signal, a pair of comets (comets 266P/Christensen and 335P/Gibbs) is regarded as maybe being responsible for the signal. But haven't managed to sqeeze them out of the SSD, it keeps timing out it seems. Maybe someone else manages, (probably with a lower magnitude)?

    http://www.space.com/32609-alien-wow-signal-could-soon-be-explained.html

    https://en.m.wikipedia.org/wiki/Wow!_signal


    Observation Time [change] : 1977-08-15 22:16 UT-5 (EST/CDT)

    Observer Location [change] : Perkins Observatory, Delaware [H69] ( 276°56'40.7''E, 40°15'04.4''N, 271.5 m )

    Search Region [change] : Center at (R.A.=19:25:31, Dec.=-26 57 00 J2000), Width=(0:05 x 0 05) dms

    Observer Constraints [change] : Mag. Limit=17, Require Mag. Param's.=yes, Two-Pass=yes, Max. Output=20

    Number of objects found: 1

    ***************** SBFIND v2.7-linF95 2016-Apr-23 10:04:37 *****************

    Observation Date = 1977-Aug-16 03:15:59 (2443371.636111 UT)

    Location = Ohio Wesleyan University

    Center R.A., Dec. = 19:25:31, -26 57'00" (J2000)

    Offsets (+/-) = 00:05:00, +00 05'00"
    Magnitude Limit = 17.0
    Magnitude Req. = true
    Requested Group = all asteroids and comets

                                J2000                     Dist. from Center
                                    R.A.        Dec.       R.A.  Dec.  Norm  Vmag
    

    IAU# Object Name hh:mm:ss.ss +dd mm'ss.s" (s) (") (")


     7409 1990 BS                 19:25:52.69 -26 57'52.8"   21.7 -52.8 329.6  16.9 
    

    Result

    Mai-belt asteroid, center norm (s) 329.6

    http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=7409

    Posted

  • c_cld by c_cld

    Have a look at https://talk.galaxyzoo.org/#/boards/BGZ0000007/discussions/DGZ0000x5k to check others transients objects 😃

    Posted