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

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 91 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3228103734359388 4.8652e-08  
a 1.209804286436701 1.5637e-09 AU
q .8192669129476701 5.9517e-08 AU
i 2.684201672642324 5.5161e-06 deg
node 189.40514006 4.6615e-05 deg
peri 301.7578668736173 4.8236e-05 deg
M 239.2063347115694 1.3415e-05 deg
tp 2457163.584529083040
1.8019e-05 JED
period 486.0389849890372
n .740681326227607 1.436e-09 deg/d
Q 1.600341659925732 2.0685e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      636  
   data-arc span      11752 days (32.18 yr)  
   first obs. used      1982-04-24  
   last obs. used      2014-06-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56184  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:05:58  

Additional Information
 Earth MOID = .0136804 AU 
 T_jup = 5.213 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 19.03 mag 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. 2015-Feb); Warner et al., 2009 Published Reference List:
[Wisniewski, W.Z. (1991) Icarus 90, 117-122.]
[Polishook, D. (2012) Minor Planet Bul. 39, 187-192.]
[Skiff, B.A. (2013) Posting on CALL web site.]
B-V BV 1.022 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=24.51 deg.
U-B UB .503 mag .039 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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: 2013-09-05

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2015-Mar-27 01:56 UT
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