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2893 Peiroos (1975 QD)
Classification: Jupiter Trojan          SPK-ID: 2002893
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07735467241888731 4.9054e-08  
a 5.145314826772759 7.8684e-08 au
q 4.747300683855708 2.9699e-07 au
i 14.66437261952795 4.4391e-06 deg
node 108.7831184033998 2.0054e-05 deg
peri 172.2293392106496 3.9978e-05 deg
M 301.1083557756654 3.6612e-05 deg
tp 2459697.876864509388
(2022-Apr-28.37686451)
0.00043742 TDB
period 4263.010050577616
11.67
9.7787e-05
2.677e-07
d
yr
n .08444737303662275 1.9371e-09 deg/d
Q 5.54332896968981 8.477e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2338  
   data-arc span      32001 days (87.61 yr)  
   first obs. used      1933-01-25  
   last obs. used      2020-09-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40732  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:05:04  

Additional Information
 Earth MOID = 3.73144 au 
 Jupiter MOID = .300817 au 
 T_jup = 2.930 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.0   n/a MPO473805 IRAS observations used: 5
diameter diameter 86.884 km 0.954 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 8.945 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Gonano, M.; Di Martino, M.; Mottola, S.; Neukum, G. (1991) Adv. Space Res. 11, no. 12, 197-200.]
[Stephens, R.D.; Coley, D.R.; French, L.M. (2016) Minor Planet Bull. 43, 265-270.]
[Stephens, R.D. (2017) Minor Planet Bull. 44, 123-125.]
[Stephens, R.D.; Warner, B.D. (2018) Minor Planet Bull. 45, 124-128.]
[Stephens, R. D.; Warner, B. D. (2019) MPB 46, 315-317.]
geometric albedo albedo 0.048   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
B-V BV 0.730   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=10.52, mean=10.54, max.=10.56) deg.
U-B UB 0.252   0.083 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=10.52, mean=10.54, max.=10.56) deg.
Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices

2893 Peiroos (1975 QD)          Discovered 1975-Aug-30 by Felix Aguilar Observatory at El Leoncito
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1975 QD = 1933 BJ = 1970 EE = 1979 YV4 = 1981 AP 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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