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JPL Small-Body Database Browser
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3361 Orpheus (1982 HR)
Classification: Apollo [NEO, PHA]          SPK-ID: 2003361
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455844.5 (2011-Oct-10.0) TDB
Reference: JPL 132 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3227518287938224 3.7127e-08  
a 1.209662179045708 1.1101e-09 au
q .8192414985359853 4.5113e-08 au
i 2.685064208145241 4.0392e-06 deg
node 189.5305495453812 4.38e-05 deg
peri 301.6952073346065 4.4104e-05 deg
M 102.8299018073053 7.9289e-06 deg
tp 2455705.692957596580
(2011-May-24.19295760)
1.0813e-05 TDB
period 485.9533500175061
1.33
6.6891e-07
1.831e-09
d
yr
n .7408118495057834 1.0197e-09 deg/d
Q 1.60008285955543 1.4683e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] 2.095597614176399E-14 2.915E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      870  
   data-arc span      13173 days (36.07 yr)  
   first obs. used      1982-04-24  
   last obs. used      2018-05-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47356  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jan-14 15:11:50  

Additional Information
 Earth MOID = .0135908 au 
 Jupiter MOID = 3.45075 au 
 T_jup = 5.213 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ show covariance matrix ]

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 19.03   n/a PDS3 (MPC 17268)  
diameter diameter 0.3 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed light albedo (0.40)
rotation period rot_per 3.532 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Wisniewski, W.Z. (1991) Icarus 90, 117-122.]
[Polishook, D. (2012) Minor Planet Bull. 39, 187-192.]
[Skiff, B.A. (2013) Posting on CALL web site. http://www.minorplanet.info/call.html]
geometric albedo albedo 0.357   0.135 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
B-V BV 1.022   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=24.51 deg.
U-B UB 0.503   0.039 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=24.51 deg.

3361 Orpheus (1982 HR)          Discovered 1982-Apr-24 by Torres, C. at Cerro El Roble
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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