Update centaur/TNO data, models & textures

Co-author: pedro_jg

README

@@ -35,7 +35,7 @@ Texture maps
 
 # Askaniy (https://www.deviantart.com/askaniy)
 
-   Textures of Phobos, Jupiter, Ganymede, Saturn, Uranus, Puck, Neptune, Triton, Pluto, and Charon.
+   Textures of Phobos, Jupiter, Ganymede, Saturn, Uranus, Puck, Neptune, Triton, Pluto, Charon, and Arrokoth.
 
    Haumea's (fictional) ring texture is by Askaniy.
 
@@ -145,6 +145,8 @@ Texture maps
   is by Askaniy. Titan's cloud texture is by Fridger Schrempp, based on resources
   available from the imaging site (Ciclops) of the Cassini mission http://ciclops.org/
 
+# Chariklo's ring texture is by Zemlyanin.
+
 # The exoplanet textures (exo-classN and venuslike) and the asteroid.jpg
   texture were created by cubicApocalypse, licensed under CC-BY 4.0.
 
@@ -272,3 +274,6 @@ covered.
 # The Puck model is by Askaniy.
 
 # The Hydra model is by LukeCEL.
+
+# The Arrokoth model is derived from the Spencer et al. 2020 model:
+    https://doi.org/10.6084/m9.figshare.11485443

data/asteroids.ssc

@@ -526,32 +526,3 @@
 
 	Albedo 0.15 
 }
-
-# Centaurs
-"2060 Chiron:Chiron:1977 UB:95P Chiron" "Sol" 
-{ 
-	Class "asteroid" 
-	Texture "asteroid.jpg" 
-        Color [ 1.000 0.960 0.919 ]
-	BlendTexture true
-	Radius 144 
-
-	EllipticalOrbit 
-	{ 
-	Epoch        2449608.5      # 1994 Sep 13 00:00UT
-	Period            50.90359 
-	SemiMajorAxis     13.734941 
-	Eccentricity       0.384424 
-	Inclination        6.927771 
-	AscendingNode    209.395188 
-	ArgOfPericenter  339.432152 
-	MeanAnomaly      349.983669 
-	} 
-
-	UniformRotation
-	{
-	Period 5.918 
-	}
-
-	Albedo 0.048 
-}