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C/2015 XY1 (Lemmon)
Classification: Hyperbolic Comet          SPK-ID: 1003427
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

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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 2458202.5 (2018-Mar-25.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.00403149022112 1.162e-05  
a -1966.50748362213 5.665 au
q 7.92795568998199 1.3093e-05 au
i 148.8468905335813 2.3773e-05 deg
node 281.6160610553572 2.3133e-05 deg
peri 196.3540866111701 0.00010538 deg
M -.000406424812406807 1.7511e-06 deg
tp 2458238.459988589966
(2018-Apr-29.95998859)
0.0018196 TDB
period n/a
n/a
n/a
n/a
d
yr
n 1.130213963750291E-5 4.8837e-08 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      724  
   data-arc span      1782 days (4.88 yr)  
   first obs. used      2015-12-04  
   last obs. used      2020-10-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .61257  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-02 23:42:38  

Additional Information
 Earth MOID = 6.95499 au 
 Jupiter MOID = 2.84631 au 
 T_jup = -1.761 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 6.4   0.6 36 from 545 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 8.25   n/a 36 autocmod 2.9c
comet nuclear magnitude M2 9.2   0.4 36 from 99 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 36 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 36 autocmod 2.9c
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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