Update Phobos/Deimos data, models, textures

CelestiaProject · Jul 6, 2024 · 3356b4d · 3356b4d
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diff --git a/README b/README
@@ -50,7 +50,7 @@ Texture maps
 
    Haumea's (fictional) ring texture is by Askaniy.
 
-   The Deimos and Callisto textures were made by Askaniy from JVV's textures.
+   The Callisto texture were made by Askaniy from JVV's texture.
 
 # FarGetaNik (https://www.deviantart.com/fargetanik)
 
@@ -149,6 +149,10 @@ Texture maps
 
    The Ida and Gaspra photomosaic maps are by Phil Stooke.
 
+   The Deimos map is from:
+      Stooke. P., Stooke Small Bodies Maps V3.0. MULTI-SA-MULTI-6-STOOKEMAPS-V3.0. NASA Planetary Data System, 2015.
+      https://sbnarchive.psi.edu/pds3/multi_mission/MULTI_SA_MULTI_6_STOOKEMAPS_V3_0/document/00_map_guide.html
+
 # Venus's clouds are from Björn Jónsson, recolored by FarGetaNik.
 
 # The textures for the Uranian satellites were created by Ivan Rivera from JPL
@@ -280,13 +284,14 @@ covered.
   On August 20, 2020, Scott Hudson waived the commercial use restrictions on
   these models, permitting unrestricted use of them.
 
-# The Phobos, Mimas, and Phoebe models are by Rob Gaskell:
-    https://sbn.psi.edu/pds/resource/phobosshape.html
+# Models of Phobos and Deimos are from Ernst et al. 2023:
+    https://doi.org/10.1186/s40623-023-01814-7
+  (available at https://sbmt.jhuapl.edu/shared-files/)
+
+# The Mimas and Phoebe models are by Rob Gaskell:
     https://sbn.psi.edu/pds/resource/mimasshape.html
     https://sbn.psi.edu/pds/resource/phoebeshape.html
 
-# The Deimos model is by John van Vliet.
-
 # 3D models of Amalthea, Thebe, Larissa, Proteus, Vesta, Ida, Gaspra and Halley
   are derived from Phil Stooke's Cartography of Non-Spherical Worlds.
     https://sbn.psi.edu/pds/resource/stkshape.html

diff --git a/data/solarsys.ssc b/data/solarsys.ssc
@@ -337,36 +337,32 @@
 	InfoURL	"https://en.wikipedia.org/wiki/Mars"
 }
 
-# Densities and Deimos' mass from Ernst et al. (2023), Earth Planets Space 75, 103
+# Masses and densities of Phobos and Deimos from Ernst et al. (2023), Earth Planets Space 75, 103
 # "High-resolution shape models of Phobos and Deimos from stereophotoclinometry"
 # https://ui.adsabs.harvard.edu/abs/2023EP%26S...75..103E/abstract
-# Phobos' mass from Pätzold et al. (2014), Icarus 229, 92-98
-# "Phobos mass determination from the very close flyby of Mars Express in 2010"
-# https://ui.adsabs.harvard.edu/abs/2014Icar..229...92P/abstract
+# Albedos of Phobos from Fornasier et al. (2024), A&A 686, A203
+# "Phobos photometric properties from Mars Express HRSC observations"
+# https://ui.adsabs.harvard.edu/abs/2024A%26A...686A.203F/abstract
 "Phobos:Mars I" "Sol/Mars"
 {
 	Class	"moon"
 	Mesh	"phobos.cmod"
-	MeshCenter	[ -0.233 -0.156 -0.168 ]
+	MeshCenter	[ -0.3790 -0.2983 0.2450 ]
 	Texture	"phobos.*"
-	Color	[ 1.0 0.98516 0.94386 ]
-	Radius	13.1
-	Mass	0.0000000017742578
+	Color	[ 1.0 0.987 0.942 ]
+	Radius	13.048  # maximum semi-axis; from model extent
+	Mass	1.7743e-9
 	Density	1861
-	OrbitFrame
-	{
-		EclipticJ2000	{ Center "Sol/Mars" }
-	}
 	EllipticalOrbit
 	{
-		Epoch	2456655.5  # 2013 Dec 29
-		Period	0.31891023
-		SemiMajorAxis	9376
-		Eccentricity	0.0151
-		Inclination	27.235297
-		AscendingNode	84.938846
-		ArgOfPericenter	48.660664
-		MeanAnomaly	85.232720
+		Epoch	2460000  # 2023 Feb 24 12:00
+		Period	0.319033  # mean
+		SemiMajorAxis	9378.938
+		Eccentricity	0.01468
+		Inclination	2.097806
+		AscendingNode	38.701507
+		ArgOfPericenter	66.811489
+		MeanAnomaly	173.124729
 	}
 	BodyFrame	{ EquatorJ2000 {} }
 	CustomRotation	"iau-phobos"
@@ -379,35 +375,35 @@
 	#	MeridianAngle	35.06
 	# }
 
-	LunarLambert	0.5
-	GeomAlbedo	0.071
-	BondAlbedo	0.027
+	LunarLambert	1  # Lommel-Seeliger
+	# GeomAlbedo	0.0683  # disk-resolved, green filter (538 nm)
+	Reflectivity	0.0157  # green-filter Bond albedo
 	InfoURL	"https://en.wikipedia.org/wiki/Phobos_(moon)"
 }
 
+# Albedos from Thomas et al. (1996), Icarus 123, p. 536-556
+# "The Surface of Deimos: Contribution of Materials and Processes to Its Unique Appearance"
+# https://ui.adsabs.harvard.edu/abs/1996Icar..123..536T/abstract
 "Deimos:Mars II" "Sol/Mars"
 {
 	Class	"moon"
 	Mesh	"deimos.cmod"
+	MeshCenter	[ -0.7078 -0.2013 0.9583 ]
 	Texture	"deimos.*"
-	Color	[ 1.0 0.97168 0.93149 ]
-	Radius	7.8
-	Mass	0.0000000002533937
+	Color	[ 1.0 0.975 0.932 ]
+	Radius	7.9851  # maximum semi-axis; from model extent
+	Mass	2.5339e-10
 	Density	1465
-	OrbitFrame
-	{
-		EclipticJ2000	{ Center "Sol/Mars" }
-	}
 	EllipticalOrbit
 	{
-		Epoch	2443431.5  # 1977 Oct 15
-		Period	1.2624407
-		SemiMajorAxis	23463.2
-		Eccentricity	0.00033
-		Inclination	24.167070
-		AscendingNode	84.377158
-		ArgOfPericenter	61.616854
-		MeanAnomaly	213.688382
+		Epoch	2460000  # 2023 Feb 24 12:00
+		Period	1.262361  # mean
+		SemiMajorAxis	23459.739
+		Eccentricity	0.000283
+		Inclination	2.217941
+		AscendingNode	286.210554
+		ArgOfPericenter	125.429446
+		MeanAnomaly	331.164065
 	}
 	BodyFrame	{ EquatorJ2000 {} }
 	CustomRotation	"iau-deimos"
@@ -420,8 +416,9 @@
 	#	MeridianAngle	79.41
 	# }
 
-	LunarLambert	0.5
-	GeomAlbedo	0.068
+	LunarLambert	1  # Lommel-Seeliger
+	# GeomAlbedo	0.068
+	Reflectivity	0.027  # from geometric albedo and phase integral
 	InfoURL	"https://en.wikipedia.org/wiki/Deimos_(moon)"
 }
 

diff --git a/models/deimos.cmod b/models/deimos.cmod
diff --git a/models/deimos.cmod.license b/models/deimos.cmod.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: Ernst et al. 2023 https://doi.org/10.1186/s40623-023-01814-7
+
+SPDX-License-Identifier: CC-BY-4.0
diff --git a/models/phobos.cmod b/models/phobos.cmod
diff --git a/models/phobos.cmod.license b/models/phobos.cmod.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: Ernst et al. 2023 https://doi.org/10.1186/s40623-023-01814-7
+
+SPDX-License-Identifier: CC-BY-4.0
diff --git a/textures/hires/deimos.jpg b/textures/hires/deimos.jpg
diff --git a/textures/hires/deimos.jpg.license b/textures/hires/deimos.jpg.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: Stooke. P., Stooke Small Bodies Maps V3.0. MULTI-SA-MULTI-6-STOOKEMAPS-V3.0. NASA Planetary Data System, 2015.
+
+SPDX-License-Identifier: CC-BY-4.0
diff --git a/textures/hires/phobos.jpg b/textures/hires/phobos.jpg
diff --git a/textures/lores/deimos.jpg b/textures/lores/deimos.jpg
diff --git a/textures/lores/deimos.jpg.license b/textures/lores/deimos.jpg.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: Stooke. P., Stooke Small Bodies Maps V3.0. MULTI-SA-MULTI-6-STOOKEMAPS-V3.0. NASA Planetary Data System, 2015.
+
+SPDX-License-Identifier: CC-BY-4.0
diff --git a/textures/lores/phobos.jpg b/textures/lores/phobos.jpg
diff --git a/textures/medres/deimos.jpg b/textures/medres/deimos.jpg
diff --git a/textures/medres/deimos.jpg.license b/textures/medres/deimos.jpg.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: Stooke. P., Stooke Small Bodies Maps V3.0. MULTI-SA-MULTI-6-STOOKEMAPS-V3.0. NASA Planetary Data System, 2015.
+
+SPDX-License-Identifier: CC-BY-4.0
diff --git a/textures/medres/phobos.jpg b/textures/medres/phobos.jpg
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		SPDX-FileCopyrightText: Ernst et al. 2023 https://doi.org/10.1186/s40623-023-01814-7

		SPDX-License-Identifier: CC-BY-4.0
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		SPDX-FileCopyrightText: Stooke. P., Stooke Small Bodies Maps V3.0. MULTI-SA-MULTI-6-STOOKEMAPS-V3.0. NASA Planetary Data System, 2015.

		SPDX-License-Identifier: CC-BY-4.0