C/1999 F1 Catalina
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Comet C/1999 F1 was discovered on 23 March 1999 by the Catalina Sky Survey, 2.9 yr before perihelion passage. In April, orbit determination by Brian G. Marsden showed that the object was a long-period comet moving on a hightly-inclined orbit, and allowed to find the pre-discovery observations in Spacewatch data [IAUC 7148, 1999 April 20].
This comet made its closest approach to the Earth on 13 April 2001 (5.534 au), ten months before perihelion.
Solution given here is based on data spanning over 6.5 yr in a range of heliocentric distances: 9.28 au – 5.787 au (perihelion) – 10.4 au.
This Oort spike comets suffers almost insignificant planetary perturbations during its passage through the planetary system.
See also Królikowska 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 168
data interval 1999 03 13 – 2005 08 28
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 9.28 au – 5.79 au (perihelion) – 10.4 au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 330
RMS [arcseconds] 0.43
orbit quality class 1a+
previous orbit elements (barycentric ecliptic J2000)
no. of returning VCs in the swarm 5001 *
no. of escaping VCs in the swarm 0
no. of hyperbolas among escaping VCs in the swarm 0
previous recip semi-major axis [10-6 au-1] 36.45 ± 0.58
previous perihelion distance [au] 5.122 – 5.218 – 5.238
previous aphelion distance [103 au] 54.9 ± 0.9
time interval to previous perihelion [Myr] 4.485 ± 0.104
percentage of VCs with q < 10100
dynamical status definitely dynamically old (DO+)
Time distribution of positional observations with corresponding heliocentric (red curve) and geocentric (green curve) distance at which they were taken. The horizontal dotted line shows the perihelion distance for a given comet whereas vertical dotted line – the moment of perihelion passage