Hello, I have found some data errors and missing designations and classifications in the Solar System objects data. I did already post some of that on the thread "General questions about SpaceEngine". I have been busy for some time so I was unable to post this before. I did also discuss this on the thread "COMMUNITY ADDON - Double/Multiple Asteroids fixes for SE" primarily concerning bug in the addon on barycenters.
Mosfet did already make a fix concerning Hygiea, but I think the other problems I have found have not yet been fixed. I did also find some new problems conserning comets. It seems that the diameter gained from absolute magnitude calculations seem to be off for some comets. For example comet C/1995 O1 (Hale-Bopp) is given nucleus magnitude in JPL small body database as 6.1 and albedo as 0.04. Calculation gives comets diameter as 400km but studies on this comet have revealed that its size is probably about 60 km.
Some other comets on Space Engine, not C/1995 O1 itself have been given this kind of mega-sized diameter values which are probably wrong considering C/1995 O1 (Hale-Bopp). These most obviously wrong diameters given to comets in SE are C/2010 U3 (included as 470 km!!) and 110P/Hartley (included in SE as 439 km!) when it really is estimated to be only 4,3 km in diameter. Comet C/2006 S3 (LONEOS) is in SE as diameter 295 km, I am not sure but that may be wrong, seems quite large for a comet considering the error on comets 110P and C/2010 U3. Other curious comet is C/2009 P1 (Garradd) that is listed in SE as 115 km that seems also a bit large.
Following is a list of objects included in SE with errors that I have discovered so far:
Following comets have inaccurate properties:
Comet C/2010 U3 - diameter wrong: 470 km / correct: ? km
https://ssd.jpl.nasa.gov/sbdb.cgi#top
Comet C/1995 O1 (Hale-Bopp) - Included in SE as 66 km, that is the value given by studies but magnitude gives 400 km
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Hale-Bopp
ww.physics.sfasu.edu/astro/asteroids/sizemagnitude.html
Comet 110P/Hartley - diameter wrong 439 km / correct: 4.3 km (13.3 mag)
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=110P
Comet 47P/Ashbrook-Jackson - diameter wrong: 386.57 km/ correct: 5.6 km
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=47P
Comet 9P/Tempel - diameter wrong: 67 km / correct: 6.0 km
Rotation wrong: 2.559 d / correct: 40.7 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=9p
Comet 10P/Tempel - diameter wrong: 83.85 km / correct: 10.6 km
rotation wrong: 42 h / correct: 8.93 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=10p
Comet 31P/Schwassmann-Wachmann - diameter wrong: 74.38 km / correct: 6.2 km
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=31p
Comet 117P/Helin-Roman-Alu - diameter wrong: 205.59 km / correct: 9 km
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=117P
Comet 74P/Smirnova-Chernykh - diameter wrong: 72 km / correct: 4.46 km
rotation wrong: d / correct: h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=74P
Comet C/2011 KP36 (Spacewatch) - diameter wrong: 93 km / correct: 55.100 km
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=
C/2006 S3 (LONEOS) - diameter probably wrong: 295 km / correct: ? km
https://ssd.jpl.nasa.gov/sbdb.cgi#top
Comet C/2009 P1 (Garradd) - Is the diameter wrong?: 115 km
https://ssd.jpl.nasa.gov/sbdb.cgi#top
Following asteroids have inaccurate properties:
Hygiea - diameter wrong: 862 km /correct: 407 km
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Hygiea
Interamnia - diameter wrong: 181.76 km /correct: 306.313 km
rotation wrong: 7.922 d /correct: 8.727 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Interamnia
Davida - diameter wrong: 132.49 km / correct: 270.327 km
rotation wrong: 9.258 d /correct: 5.1297 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Davida
Cybele - diameter wrong: 106.82 km / correct: 237.26km
rotation wrong: 10.335 d /correct: 6.0814 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Cybele
Europa (asteroid) - diameter wrong: 142.67 km / correct: 303.918 km
rotation wrong: 8.952 d /correct: 5.6304 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Europa
Hebe - diameter wrong?: 167.29 km / correct: 185.18 km
rotation wrong: 8.24 d /correct: 7.2745 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Hebe
Astraea - diameter wrong?: 109.82 km / correct: 106.699 km
rotation wrong: 10.175 d /correct: 16.806 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Astraea
Iris - diameter wrong?: 204 km / correct: 199.83 km
rotation wrong: 7.457 d /correct: 7.139 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Iris
Flora - diameter wrong?: 136.87 km / correct: 147.491 km
rotation wrong: 9.104 d /correct: 12.865 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Flora
Metis (asteroid) - diameter wrong?: 137.19 km / correct: 190 km
rotation wrong: 9.083 d /correct: 5.079 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Metis
Parthenope - diameter wrong?: 124.55 km / correct: 142.887 km
rotation wrong: 9.560 d /correct: 13.7204 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Parthenope
Victoria - diameter wrong?: 80.2 km / correct: 115.087 km
rotation wrong: 11.893 d /correct: 8.6599 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Victoria
Egeria - diameter wrong?: 104.67 km / correct: 222.792 km
rotation wrong: 10.429 d /correct: 7.045 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Egeria
Irene - diameter wrong?: 144.88 km / correct: 152 km
rotation wrong: 8.864 d /correct: 15.028 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Irene
Eunomia - diameter wrong?: 217.17 km / correct: 231.689 km
rotation wrong: 7.255 d /correct: 6.083 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Eunomia
Psyche - diameter wrong?: 166 km / correct?: old estimate 253 – new 196 km
rotation wrong: 8.295 d /correct: 4.196 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Psyche
http://www.occultations.org.nz/planet/2 ... psyche.htm
Philippina - diameter wrong?: 45.82 km / correct: 50.491 km
rotation wrong: 15.828 d /correct: 5.899 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Philippina
Nemesis - diameter wrong: 69.73 km / correct: 162.515 km
rotation wrong: 12.79 d /correct: 77.81 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Nemesis
Lutetia - diameter wrong?: 84.73 km / correct: 95.76 km
rotation wrong: 11.571 d /correct: 8.1655 h
(Realistic shape and texture are missing.)
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Lutetia
Following TNO:s have inaccurate properties:
Chaos - diameter wrong: 238.43 km /correct: 600+140−130 km
https://arxiv.org/pdf/1204.0697v1.pdf
Huya – rotation wrong? 13 h / correct? 5.28 h
http://www.johnstonsarchive.net/astro/a ... 38628.html
Sedna – diameter wrong: 1700 km / correct: 995 ± 80 km
rotation wrong: 2.6 d / correct: 10.273 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Sedna
http://adsabs.harvard.edu/abs/2012A&A...541L...6P
Quaoar – diameter wrong? 1250 km / correct: 1073.6 ± 37.9 km
rotation wrong? 17 h/ correct: 8.839 h?
http://www.aanda.org/articles/aa/pdf/20 ... 329-13.pdf
http://www.johnstonsarchive.net/astro/a ... 50000.html
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Quaoar
Varuna – rotation wrong: 3.5 d / correct: 6.3436 h
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Varuna
2010 EK139 – diameter wrong? 414.77 km /correct:? 470+35-10 km
rotation wrong: 5.266 d / correct: 7.07 h
minor planet designation (alternate name) is missing, that is: (471143) 2010 EK139
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=471143
http://adsabs.harvard.edu/abs/2012A&A...541L...6P
Following dual classification objects (minor planet and comet) are missing one or another designation. One is shown with only its minor planet designation, others are displayed with comet designations only (inconsistent data in game). Some of them also have incorrect properties:
Chiron / (2060) Chiron - comet designation is missing, that is: 95P Chiron
Also Chiron's coma is missing
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Chiron
http://www.minorplanetcenter.net/iau/li ... tatus.html
https://www.researchgate.net/publicatio ... d_its_coma
Echeclus / 174P Echeclus - diameter wrong: 8.57 km / correct: 59 km
rotation wrong: 16 h /correct: 26.802 h
minor planet designation (alternate name) is missing, that is: (60558) Echeclus
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Echeclus
http://www.minorplanetcenter.net/iau/li ... tatus.html
Elst-Pizarro / 133P Elst-Pizarro - diameter wrong: 0.774 km / correct: 3.200 km
pyörähdysaika väärä: 20 h /correct: 3.471 h
minor planet designation (alternate name) is missing, that is: (7968) Elst-Pizarro
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=133P
http://www.minorplanetcenter.net/iau/li ... tatus.html
LINEAR / 176P LINEAR - diameter wrong: 0.763 km / correct: 3.5 km
minor planet designation (alternate name) is missing, that is: (118401) LINEAR
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=176P
http://www.minorplanetcenter.net/iau/li ... tatus.html
Wilson-Harrington / (4015) Wilson-Harrington / 107P Wilson-Harrington – is missing entirely from the game
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=107P
http://www.minorplanetcenter.net/iau/li ... tatus.html
Dwarf planets and TNO:s have their minor planet designations (alternate names) shown in the game. Following dwarf planets are missing their minor planet designations (inconsistent data in game):
Pluto - Minor planet designation (alternate name) is missing, that is: (134340) Pluto
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Pluto
http://www.minorplanetcenter.net/iau/lists/TNOs.html
http://www.minorplanetcenter.net/dwarf_planets
http://www.minorplanetcenter.net/db_sea ... _id=134340
http://www.minorplanetcenter.net/iau/mp ... 06R19.html
Pluto's moon Nix seems to be missing realistic shape and texture. Following moons/dwarf moons are missing their satellite designations (inconsistent data in game):
Galilean moons of Jupiter
Dysnomia of Eris
Moons of Pluto
Moons of Mars
https://planetarynames.wr.usgs.gov/Page/Planets
Following interesting objects are missing from SE:
Moon of TNO 1998WW31 is missing, TNO:s Arawn, 1992 QB1, 1993 RO and 1993 SB are missing. 1992 QB1, 1993 RO, and 1993 SB are all early discovered TNO:s and so it would be nice if they would be included. Arawn was studied realively close by by New Horizons spacecraft so there is relatively accurate info on its properties.
Asteroids Steins, Mathilde, Annefrank and Braille are missing. These asteroids have been studied close by by spacecrafts, so there is accurate data on them.
Comets 81P/Wild and 103P/Hartley that were studied close by spacecrafts are missing.
Also, considering their diameters, why are Neptune's Nereid and Proteus classed as moons but Eris' Dysnomia as a dwarf moon?