Dust shells and dark linear structures on dust tails of historical and recent long-period comets

Open Access

Table 2

Model fitting parameters to retrieve the observed structures in each object.

Comet	Obs. date (UT)	r_h (au)	∆T(d)	I°	Φ°	$λ_{\min}^{o}$ $\lambda _{\min }^{\rm{o}}$	$λ_{\max}^{o}$ $\lambda _{\max }^{\rm{o}}$
C/1858 L1 (Donati)	15-Oct.-1858	0.663	+15	165	190	–60	+20
C/1874 H1 (Coggia)	10-Jun.-1874	0.902	–29	Sunward emission
C/1874 H1 (Coggia)	09-Jul.-1874	0.676	0	90	180	–55	+55
C/1881 K1 (Tebbutt)	26-Jun.-1881	0.757	+9	90	160	–10	+85
C/1901 G1 (Viscara)	04-May-1901	0.391	+11	90	80	+10	+40
C/2020 F3 (NEOWISE)	17-Jul.-2020	0.495	+14	160	170	–50	+50
C/2023 A3 (Tsuchishan-ATLAS)	13-Oct.-2024	0.563	+16	90	260	–45	0

Notes. r_h: heliocentric distance at observation; ∆T: time to comet’s perihelion; I: obliquity; Φ: argument of the subsolar meridian at perihelion; λ_min , λ_max : latitude limits of the active area.

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