Physical activity of the selected nearly isotropic comets with perihelia at large heliocentric distance

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Table 4

Color indices and normalized reflectivity gradients.

Designation	r	I/O	Θ_ref ¹	B − V	V − R	R − I	S^′ (BV)	S^′ (VR)	S^′ (RI)
	(au)		(′′)	(mag)	(mag)	(mag)	([%/1000 Å])	([%/1000 Å])	([%/1000 Å])
/2005 L3	08.28	O	10.2	0.73 ± 0.03	0.48 ± 0.03		6 ± 2	1 ± 2
C/2005 S4	06.68	O	9.9
C/2006 S3	10.59	O	7.4	0.73 ± 0.06			6 ± 5
C/2008 FK75	04.60	I	10.2	0.84 ± 0.03	0.44 ± 0.03		15 ± 2	−2 ± 2
C/2008 S3	09.84	I	9.9	0.93 ± 0.16	0.52 ± 0.10		22 ± 13	4 ± 6
C/2008 S3	10.16	O	6.0
C/2009 F4	08.64	O	10.2		0.45 ± 0.07			10 ± 6
C/2009 S3	07.08	O	5.4	0.79 ± 0.04	0.37 ± 0.04	0.34 ± 0.05	12 ± 2	−2 ± 2	−1 ± 2
C/2010 S1	07.13	I	10.2	0.70 ± 0.03			3 ± 3
C/2010 S1	06.26	O	10.2	0.80 ± 0.04	0.45 ± 0.02		14 ± 4	10 ± 3
C/2010 S1	06.69	O	10.2	0.76 ± 0.09	0.42 ± 0.04		10 ± 8	6 ± 3
C/2010 U3	12.64	I	6.6		0.48 ± 0.13			12 ± 12
C/2012 A1	07.82	I	9.0	0.88 ± 0.03	0.42 ± 0.03	0.36 ± 0.03	19 ± 2	2 ± 2	1 ± 2
C/2012 K8	06.46	I	6.6	0.79 ± 0.12	0.61 ± 0.08		13 ± 10	24 ± 7
C/2013 C2	09.37	I	4.2	0.86 ± 0.17	0.50 ± 0.05		19 ± 16	14 ± 5
C/2013 F2	06.65	I	4.5		0.50 ± 0.08			14 ± 8
C/2013 V4	05.21	O	9.9	0.76 ± 0.05	0.42 ± 0.04		8 ± 4	−3 ± 2
Sun²				0.64	0.35
Sun³				0.66	0.46
Sun⁴				0.65	0.39	0.35

Notes. ⁽¹⁾ Reference aperture expressed in arcsec, ⁽²⁾ the solar colors from Holmberg et al. (2006), ⁽³⁾ the solar colors for the filters used at Terskol observatory, ⁽⁴⁾ the solar colors for the filters used at SAO RAN.

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