Confirmation of four NEOCP objects, one still in the possible comet confirmation page with an arc of 36 days, the preliminary orbit's semi axis a=419 AU and eccentricity e=0.9957 show this could be in a nearly parabolic path coming from the outer Solar system.
M.P.E.C. 2017-G05 Issued 2017 Apr. 2, 15:37 UT
COMET C/2017 E5 (Lemmon)
COMET C/2017 E5 (Lemmon)
Orbital elements:
C/2017 E5 (Lemmon)
Epoch 2016 June 21.0 TT = JDT 2457560.5
T 2016 June 10.89088 TT MPCW
q 1.7841907 (2000.0) P Q
z +0.0024713 Peri. 306.80147 -0.34692968 -0.86108028
+/-0.0000581 Node 206.19370 -0.32985556 -0.25899953
e 0.9955907 Incl. 122.63324 -0.87797216 +0.43756141
From 72 observations 2017 Feb. 9-Mar. 31, mean residual 0".5.
C/2017 E5 (Lemmon)
Epoch 2017 Feb. 16.0 TT = JDT 2457800.5
T 2016 June 10.88593 TT MPCW
q 1.7836531 (2000.0) P Q
z +0.0023796 Peri. 306.78462 -0.34660076 -0.86121194
+/-0.0000581 Node 206.19649 -0.32990188 -0.25905510
e 0.9957556 Incl. 122.64167 -0.87808466 +0.43726931
From 72 observations 2017 Feb. 9-Mar. 31, mean residual 0".5.
C/2017 E5 (Lemmon)
Epoch 2016 June 21.0 TT = JDT 2457560.5
T 2016 June 10.89088 TT MPCW
q 1.7841907 (2000.0) P Q
z +0.0024713 Peri. 306.80147 -0.34692968 -0.86108028
+/-0.0000581 Node 206.19370 -0.32985556 -0.25899953
e 0.9955907 Incl. 122.63324 -0.87797216 +0.43756141
From 72 observations 2017 Feb. 9-Mar. 31, mean residual 0".5.
C/2017 E5 (Lemmon)
Epoch 2017 Feb. 16.0 TT = JDT 2457800.5
T 2016 June 10.88593 TT MPCW
q 1.7836531 (2000.0) P Q
z +0.0023796 Peri. 306.78462 -0.34660076 -0.86121194
+/-0.0000581 Node 206.19649 -0.32990188 -0.25905510
e 0.9957556 Incl. 122.64167 -0.87808466 +0.43726931
From 72 observations 2017 Feb. 9-Mar. 31, mean residual 0".5.
Unfairly enough the contributors to the confirmation of the comet which sent observations to help determine the nature and orbit of this object do not have access to the discovery publication unless the have paid for it, a publication using the observers data and the observers don't have access to it!
- CBET 4380 : 20170402 : COMET C/2017 F1 (LEMMON)
Also, a potentially hazardous Apollo type asteroid 2017 FE1
MPEC F44: 2017 FE1 [a=2.43,e=0.62,i=3.1,H=20.2,PHA]
Epoch 2017 Feb. 16.0 TT = JDT 2457800.5 MPC
M 329.28424 (2000.0) P Q
n 0.26080549 Peri. 201.74297 -0.14480126 +0.98836469
a 2.4261905 Node 59.95814 -0.89970291 -0.11193657
e 0.6227606 Incl. 3.08318 -0.41178547 -0.10298275
The perihelion distance q can be calculated from the semi axis a and eccentricity e as,
q = a * (1-e) = 0.9152546 AU
The Earths semi axis being 1 AU, this means this object crosses the Earth's orbit.
And two new Amor type NEOs,
MPEC F37: 2017 FD1 [a=1.24,e=0.15,i=39.4,H=21.4] 2017 FD1
MPEC F36: 2017 FC1 [a=2.64,e=0.61,i=2.4,H=25.7] 2017 FC1
