Hello, everybody.
Comet C/2017 U1 may be the first incoming (outging now, actually) object discovered with an interstellar trajectory (that, or it´s Rama

).
http://www.minorplanetcenter.net/mpec/K17/K17UI1.htmlCelestia does not plot its orbit nor its name, because Celestia does not like hyperbolic orbits

. Will Celestia.Sci do?
Guillermo
# Comet C/2017 U1 (Panstarrs)
# Source:
http://www.minorplanetcenter.net/mpec/K17/K17UI1.html# Orbital elements:
# Epoch 2017 Sept. 4.0 TT = JDT 2458000.5
# T 2017 Sept. 9.41719 TT MPCW
# q 0.2515404 (2000.0) P Q
# z -0.7541603 Peri. 241.01670 -0.63536548 +0.68733697
# +/-0.0181483 Node 24.61531 +0.49903801 +0.71329677
# e 1.1897018 Incl. 122.32770 -0.58929769 -0.13702411
# From 34 observations 2017 Oct. 18-24, mean residual 0".5.
#
# Guillermo Abramson (
g.abramson@gmail.com)
"C2017 U1" "Sol"
{
Class "comet"
Mesh "roughsphere.cms"
Texture "asteroid.jpg"
Radius 5.0 # guess
RotationPeriod 5.0 # guess
Albedo 0.2 # guess
EllipticalOrbit
{
Epoch 2458000.5 ##2013-Nov-28.86962143
# SemiMajorAxis # a=1/z
PericenterDistance 0.2515404 # q: more natural than semimajor axis for hyperbolic orbit
Eccentricity 1.1897018 # e
Period 1.5268783711297478595937466090309 # P = (q/(e-1))^1.5 for hyperbolic orbit (
https://www.classe.cornell.edu/~seb/cel ... meris.html)
Inclination 122.32770 # i
AscendingNode 24.61531 # Node
ArgOfPericenter 241.01670 # Peri
MeanAnomaly 0.000000
}
}