API VERSION: 1.2
API SOURCE: NASA/JPL Horizons API

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JPL/HORIZONS                     Dimorphos (Didymos I)                120065803
Updated: 2026-Oct-30          Solution (s547 + Hera latest)
                 https://iopscience.iop.org/article/10.3847/PSJ/ad26e7/pdf
 
This is the DART mission's post-impact reconstructed trajectory for Dimorphos, 
-satellite- of the 65803 Didymos system & the IMPACTED TARGET. It is merged
with the latest estimates from the Hera follow-up mission.

The trajectory data includes the pre- and post-impact ephemeris for Dimorphos.
For surface cartographic locations, pre- and post-impact Dimorphos rotation 
models are used automatically.

To use Dimorphos as a coordinate origin, set center to "@ 120065803". 

DART impact was on 26-Sep-2022 @ 23:14:24.183 UTC, equivalent to 2022-Sep-26
23:15:33.365 TDB.

Related objects:
  DART spacecraft           :      -135 (mission navigation)
  LICIACube spacecraft      :      -210 (mission navigation)
  Didymos system barycenter :  20065803 (JPL s205 mission reconstruction)
                                 65803; (latest JPL ground-based solution)
  Didymos primary body      : 920065803 (JPL s547 reconstruction + Hera latest)

 Dimorphos physical parameters:
  Radii   ~ (0.09594 x 0.07390 x 0.05856) km
  Volume  ~ 0.001616 km^8
  GM_Dimo ~ 3.02680E-10 km^3/s^2
            Possible Dimorphos mass-ejection (0.1-0.5%) is not reflected here,
            perhaps measured later by follow-on ESA mission Hera.

 Pre-impact Dimorphos spin pole (ICRF at J2000.0 epoch, east long. positive)
  RA  =  69.70029 deg. 
  DEC = -72.69527 deg.
  PM  =  73.38929405 deg., 724.7244051 deg/day, 1.0256E-06 deg^2/day^2
         (period is 11.92177 hrs)

 Post-impact Dimorphos spin pole 
  A dynamic frame where the X axis points from Dimorphos center to Didymos 
  center. The Z axis is parallel to the pre-impact Z axis.
  RA  =  69.70029 deg. 
  DEC = -72.69527 deg.

 Precomputed trajectory file merge (JPL + ESA):
 Name                                     Start (TDB)        Stop (TDB)
 ---------------------------------------  -----------------  -----------------
 dimorphos_s547_long (JPL)                2000-Jan-01 00:14  2026-Jul-01 00:00
 dimorphos_fsp_000005_260701_270701_v01   2026-Jul-01 00:00  2027-Jun-30 00:00
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