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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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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.


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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457047.5 (2015-Jan-25.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07524373426784382 4.907e-08  
q 4.768410286874526 2.9832e-07 au
tp 2455428.045014747838
(2010-Aug-19.54501475)
0.0004357 TDB
node 108.7711315057392 2.0057e-05 deg
peri 172.1730951615685 4.0805e-05 deg
i 14.65446955877907 4.4358e-06 deg
  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
 Jupiter MOID = .300817 au 
 T_jup = 2.930 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.407845371248383E-15 -1.430738030498335E-14 -4.025644819164637E-12 -2.968713179686945E-15 -3.382457699025415E-13 -1.76499178377636E-15
q -1.430738030498335E-14 8.89938111833214E-14 2.173758689659834E-11 2.231958311377391E-14 1.996310795282155E-12 1.301794201562896E-14
tp -4.025644819164637E-12 2.173758689659834E-11 1.89835444766242E-7 -9.153688230363577E-14 1.552991780152661E-8 2.27113030056092E-11
node -2.968713179686945E-15 2.231958311377391E-14 -9.153688230363577E-14 4.022860485438914E-10 -3.88823430446931E-10 -3.350910508653758E-12
peri -3.382457699025415E-13 1.996310795282155E-12 1.552991780152661E-8 -3.88823430446931E-10 1.665058746511407E-9 5.215757902150793E-12
i -1.76499178377636E-15 1.301794201562896E-14 2.27113030056092E-11 -3.350910508653758E-12 5.215757902150793E-12 1.967660127382225E-11

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. 2020-October); 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.]
[Stephens, R.D.; Warner, B.D. (2020) Minor Planet Bull. 47, 285-289.]
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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