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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07740017358413438 2.1461e-08  
a 5.144228343179261 7.1186e-08 au
q 4.746064176460762 1.5641e-07 au
i 14.66453993758009 1.2337e-06 deg
node 108.7818029534159 4.4942e-06 deg
peri 172.4490827053727 1.7701e-05 deg
M 317.804843496509 2.1226e-05 deg
tp 2459700.003901799689
(2022-Apr-30.50390180)
0.00025485 TDB
period 4261.659857405917
11.67
8.8459e-05
2.422e-07
d
yr
n .08447412793266258 1.7534e-09 deg/d
Q 5.542392509897759 7.6695e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2471  
   data-arc span      32196 days (88.15 yr)  
   first obs. used      1933-01-25  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40447  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:36:15  

Additional Information
 Earth MOID = 3.72827 au 
 Jupiter MOID = .300516 au 
 T_jup = 2.930 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457143.5 (2015-May-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07529468878728623 2.1455e-08  
q 4.767533177589895 1.5702e-07 au
tp 2455426.864337841650
(2010-Aug-18.36433784)
0.00024183 TDB
node 108.7698755272325 4.4946e-06 deg
peri 172.0588498998744 1.8069e-05 deg
i 14.65483100477283 1.2327e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2471  
   data-arc span      32196 days (88.15 yr)  
   first obs. used      1933-01-25  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40447  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:36:15  

Additional Information
 Jupiter MOID = .300516 au 
 T_jup = 2.930 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.60333427980073E-16 -3.143791929473723E-15 4.015541465943273E-13 -1.472059047054773E-14 -1.166884602015744E-14 4.301617447018605E-15
q -3.143791929473723E-15 2.465671392746294E-14 -1.642098801222073E-12 7.596525293560682E-14 3.141567690445743E-13 -2.259261738470331E-14
tp 4.015541465943273E-13 -1.642098801222073E-12 5.848024197337323E-8 2.002069572652328E-10 4.179079468797156E-9 -4.746055138138668E-11
node -1.472059047054773E-14 7.596525293560682E-14 2.002069572652328E-10 2.020169722259053E-11 -3.179091957043494E-12 -5.280591321131996E-12
peri -1.166884602015744E-14 3.141567690445743E-13 4.179079468797156E-9 -3.179091957043494E-12 3.264996797230136E-10 1.228266082947018E-12
i 4.301617447018605E-15 -2.259261738470331E-14 -4.746055138138668E-11 -5.280591321131996E-12 1.228266082947018E-12 1.519642502176997E-12

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.11   n/a E2020-QM5 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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