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Table 2

Orbital and physical parameters of the Neptunian irregulars taken from JPL (http://ssd.jpl.nasa.gov).

Irregular satellites r s* ρ s** Magnitude Albedo ax e i+ P++

I Triton 1,352.6 2.06 13.5 Vo 0.76 14.33 0.0000 156.885 5.88
II Nereid 170.0 1.50 19.7 Vo 0.16 222.65 0.7507 7.230 360.13
IX Halimede 31.0 1.50 19.2 R 0.04 670.77 0.2646 112.712 1879.08
XI Sao 22.0 1.50 24.5 R 0.04 897.60 0.1365 53.483 2912.72
XII Laomedeia 21.0 1.50 25.5 R 0.04 951.66 0.3969 37.874 3171.33
XIII Neso 30.0 1.50 24.6 R 0.04 1990.19 0.5714 136.439 9740.73
XPsamathe 20.0 1.50 25.5 R 0.04 1942.17 0.3809 126.312 9074.30

Notes.  .

(*)

The mean satellite radius rs is given in km.

(**)

The mean satellite density ρs is given in g cm-3.

(x)

The orbital semiaxis a is in units of RN = 24   764 km

(+)

The orbital inclination i is measured with respect to the ecliptic.

(++)

The orbital period P is given in days.

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