This file is indexed.

/usr/share/xplanet/spice/cassini.krn is in xplanet 1.3.0-4+b1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# These kernel files are from
# ftp://naif.jpl.nasa.gov/pub/naif/CASSINI/kernels/spk/
#
# Add more recent kernel files at the bottom.
#

# Saturn and its minor satellites, relative to Saturn barycenter
sat128.bsp	               # 2001 DEC 25 to 2009 DEC 19

# Saturn and its major satellites, relative to Saturn barycenter
020514_SE_SAT105.bsp           # 2002 JAN 12 to 2013 JAN 08

# Cassini orbiter, relative to the Sun
971103_SCEPH_LP0_SP0.bsp       # 1997 OCT 15 to 2004 AUG 01
030201AP_SK_SM546_T45.bsp      # 2003 JAN 01 to 2008 AUG 09

# Major planet barycenters and Sun, relative to Solar system
# barycenter 
981005_PLTEPH-DE405S.bsp       # 1959 DEC 10 to 2020 JAN 16 

# Cassini orbiter and probe, relative to the Sun
040622AP_OPK_04122_08222.bsp   # 2004 MAY 01 to 2008 AUG 09

# Cassini orbiter, major planet barycenters and Sun, major satellites
040622AP_SCPSE_04122_08222.bsp # 2004 MAY 01 to 2008 AUG 09