C/1947 Y1 Mrkos
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Comet C/1947 Y1 was discovered on 20 December 1947 by Antonín Mrkos (Skalnaté Pleso Observatory, Slovakia), that is two months before perihelion passage; the comet was last seen on 30 November 1948. [Kronk, Cometography: Volume 4].
This comet made its closest approach to the Earth on 17 February 1948 (1.674 au), that is almost at the moment of perihelion passage.
Solution given here is based on data spanning over 0.890 yr in a range of heliocentric distances from 1.589 au through perihelion (1.500 au) to 3.848 au.
This Oort spike comet suffers slight planetary perturbations during its passage through the planetary system, and it will enter the planet zone as Oort spike comet in the next perihelion passage (see future barycentric orbit).
More details in Królikowska et al. 2014.

solution description
number of observations 124
data interval 1948 01 18 – 1948 11 30
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 1.59 au – 1.50 au (perihelion) – 3.85 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 204
RMS [arcseconds] 1.22
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 1948 02 19
perihelion date 1948 02 16.69191532 ± 0.00026620
perihelion distance [au] 1.49955491 ± 0.00000327
eccentricity 1.00108229 ± 0.00001286
argument of perihelion [°] 61.923925 ± 0.000215
ascending node [°] 199.300972 ± 0.000072
inclination [°] 77.5332 ± 0.000061
reciprocal semi-major axis [10-6 au-1] -721.74 ± 8.58
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.