Ejected from home: C/1980 E1 (Bowell) and C/2024 L5 (ATLAS)

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Table 2

Computed pre-planetary encounter Keplerian orbital elements of comets C/1980 E1 (Bowell) and C/2024 L5 (ATLAS).

Parameter		C/1980 E1 (Bowell)	C/2024 L5 (ATLAS)
Perihelion, q (au)	=	3.179958 ± 0.000005	${8.0}_{- 0.4}^{+ 0.5}$ $8.0_{ - 0.4}^{ + 0.5}$
Eccentricity, e	=	0.999962 ± 0.000008	0.70 ± 0.02
Inclination, i (º)	=	1.77204 ± 0.00010	153±2
Longitude of the ascending node, Ω (º)	=	120.638 ± 0.002	137.1 ± 0.2
Argument of perihelion, ω (º)	=	134.485 ± 0.002	$240_{- 8}^{+ 6}$ $240_{ - 8}^{ + 6}$

Noites. The pre-planetary encounter orbit estimate of C/1980 E1 includes mean values and 1σ uncertainties and it is the result of 10³ N-body calculations back in time as described in the text. The one of C/2024 L5 shows medians and 16th and 84th percentiles from 10⁴ simulations.

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