Dynamically new comet C/2025 D1 (Groeller) with record perihelion distance

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Table 2

Best-fit orbital solution for C/2025 D1 (Groeller).

Quantity	Value
Perihelion distance (au)	q 14.119662(58)
Eccentricity	e 1.003053(12)
Inclination (^◦)	i 84.466759(26)
Argument of perihelion (^◦)	ω 185.88487(38)
Longitude of ascending node (^◦)	Ω 312.897549(19)
Time of perihelion passage (TDB)^†	t_p 2028 May 19.789(12)

# observations used (discarded)	122 (28)
Observed arc	2018 June 6–2025 May 2
Residual rms (^′′)	0.435
Normalised residual rms	1.038

Notes. ^†The uncertainty is in days. The Keplerian orbital elements are referred to the heliocentric J2000 ecliptic reference frame at an osculating epoch of TDB 2025 May 2.0, with 1σ formal uncertainties expressed in the parenthesis notation.

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