C/2014 UN271 Bernardinelli-Bernstein
more info
The discovery of C/2014 UN271 was announced in June 2021 by Bernardinelli & Bernstein (2021) on the basis of astrometric observations spanning 20 nights from 20 October 2014 to 8 November 2018 (29.0 au – 23.7 au from the Sun). A little later, at a heliocentric distance of over 20 au, observers reported the cometary activity of C/2014 UN271.
The comet will pass through perihelion (10.95 au from the Sun) on 22 January 2031; thus solutions given here are currently based on pre-perihelion data taken at large heliocentric distances.
Most probably, this Oort spike comet suffers small planetary perturbations during its passage through the planetary system.

More details in Dybczyński and Królikowska 2022 (or Dybczyński and Królikowska 2022).

solution description
number of observations 59
data interval 2010 11 15 – 2021 06 22
data arc selection data generally limited to pre-perihelion (PRE)
range of heliocentric distances 34.07 au – 20.18au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting NO
number of residuals 118
RMS [arcseconds] 0.13
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 2031 01 14
perihelion date 2031 01 22.89417094 ± 0.01791083
perihelion distance [au] 10.95005891 ± 0.00010653
eccentricity 1.00071948 ± 0.00000833
argument of perihelion [°] 326.321389 ± 0.000520
ascending node [°] 190.023630 ± 0.000037
inclination [°] 95.45461 ± 0.000034
reciprocal semi-major axis [10-6 au-1] -65.70 ± 0.76
Upper panel: 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.
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).