find-rocks

Find-rocks searches for moving objects in a time-sequence of (exactly) three FITS images. For main-belt asteroids (typical motion 5”-30” per hour),  these images are of the same field taken 1-3 hours apart, but the time interval is arbitrary. It first uses sextractor to find all point-like objects in each image. It then deletes objects whose positions are the same in at least two images. Next, it performs a least-squares linear fit using the remaining object positions and times to find objects with rectilinear motion. Finally, it checks the MPC database for any matches.

Version: 2.0 8-Dec-2016

Usage: find-rocks [options]

Options:

  --version        show program's version number and exit

  -h, --help       show this help message and exit

  -f FITS images   comma-separated list of images [required]

  -m Minimum mag.  Minimum magnitude [default 21.0]

  -v               Verbose output

  -r Radius        Search radius [arcmin], default 15


Example output (two moving objects found, both are known asteroids):

find-rocks -f F8-1.fts,F8-2.fts,F8-3.fts

Sampling images for objects...

416 stars found in FITS image F8-1.fts

430 stars found in FITS image F8-2.fts

431 stars found in FITS image F8-3.fts

Looking for moving objects...

Object nr. 1, unnormalized chisq = 5.02e-03

Image F8-1.fts:   2457723.9247   08:20:58.71 +30:07:09.70    20.66

Image F8-2.fts:   2457723.9561   08:20:58.31 +30:07:18.94    20.15

Image F8-3.fts:   2457723.9838   08:20:57.99 +30:07:26.96    20.50

Motion: RA = -7.7"/hr, Dec = 12.2"/hr

Object nr. 2, unnormalized chisq = 5.54e-04

Image F8-1.fts:   2457723.9247   08:19:20.28 +30:02:11.47    19.85

Image F8-2.fts:   2457723.9561   08:19:20.52 +30:02:27.83    19.88

Image F8-3.fts:   2457723.9838   08:19:20.74 +30:02:42.46    19.92

Motion: RA = 4.8"/hr, Dec = 21.8"/hr

Looking for known objects using MPC online query...

MPC query found 5 minor bodies with V < 21.0  within 15' radius of field center (08:20:00.0 +30:00:00.3) on 2016-12-01 at 10:11:32 UT

 Number   Name               V       RA(J2000)    Dec(J2000)      Offsets            Motion        Comment

----------------------------------------------------------------------------------------------------------------------

(170874) 2004 HS37       19.30    08:19:20.20 +30:02:08.00   [  8.6',  2.1']   [  4"/hr,  21"/hr]   None needed at this time

         2010 GM86            20.60    08:20:14.50 +29:49:18.00   [ -3.1',-10.7']   [ -3"/hr,   5"/hr]   Leave for survey recovery

(125560) 2001 XS13        19.60    08:20:56.10 +30:01:41.00   [-12.1',  1.7']   [ -6"/hr,  10"/hr]   None needed at this time

(354428) 2003 WH130     20.00    08:19:44.20 +29:46:01.00   [  3.4',-14.0']   [  4"/hr,  13"/hr]   None needed at this time

(154417) 2003 BO25        19.80    08:20:58.70 +30:07:08.00   [-12.7',  7.1']   [ -6"/hr,  11"/hr]   None needed at this time


Object matches

----------------------------------------------------------------------------------

Object 1 matches position of (154417) 2003 BO25 at 08:20:58.70 +30:07:08.00

Object 2 matches position of (170874) 2004 HS37 at 08:19:20.20 +30:02:08.00

© Robert Mutel 2018