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JPL Small-Body Database Browser
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556 Phyllis (A905 AD)
Classification: Main-belt Asteroid          SPK-ID: 2000556
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 74 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1040491770223723 3.9508e-08  
a 2.463855640653617 7.7651e-09 au
q 2.207493488941678 9.8665e-08 au
i 5.246560161241411 4.4079e-06 deg
node 286.0407879971575 5.0161e-05 deg
peri 178.0417295906854 5.5109e-05 deg
M 297.1111039335792 2.4118e-05 deg
tp 2459247.270241019795
9.5063e-05 TDB
period 1412.606872178193
n .2548479744013222 1.2048e-09 deg/d
Q 2.720217792365555 8.573e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2476  
   data-arc span      41050 days (112.39 yr)  
   first obs. used      1907-09-06  
   last obs. used      2020-01-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44368  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:30:50  

Additional Information
 Earth MOID = 1.22437 au 
 Jupiter MOID = 2.39481 au 
 T_jup = 3.475 
[ 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 9.5   n/a MPO502158 IRAS observations used: 11
diameter diameter 36.279 km 0.435 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 4.293 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Zappala, V.; Scaltriti, F.; Di Martino, M. (1983) Icarus 56, 325-344.]
[Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.]
[Marciniak, A.; Michalowski, T.; Kaasalainen, M.; Durech, J.; et al. (2007) Astron. Astrophys. 473, 633-639.]
[Behrend, R. (2008) Observatoire de Geneve web site,]
[Hamanowa, H.; Hamanowa, H. (2009) Minor Planet Bull. 36, 87-88.]
[Schmidt, R.E. (2017) Minor Planet Bull. 44, 191-192.]
geometric albedo albedo 0.201   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.849   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=25.66 deg.
U-B UB 0.410   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=25.66 deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

556 Phyllis (A905 AD)          Discovered 1905-Jan-08 by Gotz, P. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A905 AD = 1950 QW 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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