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JPL Small-Body Database Browser
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66391 Moshup (1999 KW4)
Classification: Aten [NEO, PHA]          SPK-ID: 2066391
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 295 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6887202273468748 2.3719e-08  
a .6421955962832231 4.2724e-11 au
q .1999024992098799 1.5239e-08 au
i 38.88256473407696 2.1235e-06 deg
node 244.9096147427467 4.1326e-07 deg
peri 192.6184318473152 2.071e-06 deg
M 68.08613723958405 8.7804e-06 deg
tp 2458564.948690131433
(2019-Mar-22.44869013)
4.5846e-06 TDB
period 187.974704860235
0.51
1.8758e-08
5.136e-11
d
yr
n 1.915151297977412 1.9111e-10 deg/d
Q 1.084488693356566 7.2148e-11 au
  Orbit Determination Parameters
   # obs. used (total)      3927  
   # delay obs. used      37  
   # Doppler obs. used      0  
   data-arc span      7751 days (21.22 yr)  
   first obs. used      1998-05-29  
   last obs. used      2019-08-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .28656  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-11 06:10:45  

Additional Information
 Earth MOID = .0130854 au 
 Jupiter MOID = 4.22215 au 
 T_jup = 8.499 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.5   n/a MPO263856  
diameter diameter 1.317 km 0.040 Ostro et al. 2006, Science 314, 1276-1280. Equivalent volume sphere diameter. For Beta, 0.451 km +/- 6% equivalent volume sphere diameter.
extent extent 1.532 x 1.495 x 1.347 km 3% Ostro et al. 2006, Science 314, 1276-1280. Beta: 0.571 x 0. 463 x 0.349 km (6% uncertainty)
bulk density density 1.974 g/cm^3 .24 Ostro et al. 2006, Science 314, 1276-1280. Porosity of Alpha ~50%. Satellite "Beta" bulk density is 2.81 +0.82-0.63 g/cm^3 with porosity < 44%.
rotation period rot_per 2.7645 h 0.0003 Ostro et al. 2006, Science 314, 1276-1280. Radar-confirmed binary object; satellite "Beta" average rotation synchronous with orbit period of ~17.4 hours.
SMASSII spectral type spec_B S:   n/a Binzel et al. (2004) Icarus 170, 259-294 SMASSIR data only, classification consistent with specified type, but uncertain

66391 Moshup           Discovered 1999 May 20 by LINEAR at Socorro.
Moshup was a giant who lived in the coastal areas of New England, according to Native American legends, and was responsible for a variety of geologic features. As a way of maintaining balance, he married Granny Squannit, a leader of the Makiawasug, or Little People, who lived nearby. Squannit was a medicine woman of the Makiawasug who married the giant Moshup. Bad weather was attributed to times when the pair would argue. Moshup is the name of the primary, Squannit that for the satellite.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2019-08-27Last Updated: 2019-09-23

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