List of object extremes

==Introduction==
This is a list of object extremes in Space engine planetary database. An object extreme is an object or feature of an object that is very unusual or has an extreme difference in amount compared to most ordinary objects. It can be anything to moons, planets, stars, to star clusters, nebulas, and even galaxies. Here you can add anything to the list with the biggest to smallest, farthest to closest, etc.
NOTE: This only includes object extremes that are verifiable. (the object extreme has an SE code) It is very much possible that some players unknowingly have found objects that break records here, but have simply not posted them anywhere. If you want to post something that might be an object extreme, you can go to the Space Engine Subreddit, Discord, Forums, or alternatively the comment section. Make sure to include the SE code for your object extreme.
DISCLAMER: The sizes on the list are measured in diameter, not radius.
===Rules===
#An object extreme must have its SE code and version displayed.
#It must be a procedural object (although procedural objects with real parent are allowed).
#It must have a image of that object extreme in a 1:1 image ratio.
#If you want to add an object extreme that is not discovered by you, credit the original discoverer.
#You must add a cite that link to the original website if you want to add an object extreme that you found on the internet.
==List==
===Planet/Moon Extremes===
Object characteristics
Title 	Object Image	SE code 	Data 	Discoverer 	Cite 	SE Version	Notes
Largest 	 	RS 0-0-0-520-4031-2-47-17 B1 	773091.06 km (60.605 D⊕)	Cosmic Cross 	https://forum.spaceengine.org/viewtopic.php?t=62&start=255 	0.980 	
* RS 0-4-1805-187-11117-5-23397-4461 2 would be the largest planet in 0.990, measuring 186618.31 km or 14.271 D⊕ in terms of equatorial diameter, discovered by DeMooniC.https://www.reddit.com/r/spaceengine/comments/180l6od/largest_procedural_planet_ever_found_in_terms_of/
* RS 0-7-936228-546-228-4-2384-377 B1, which measures 182969.55 km or 14.36 D⊕, would qualify as the biggest planet in 0.990 if equatorial diameter is not taken into account, discovered by SpaceBurger1.
* It is believed the size limit in 0.990 is somewhere around 16 Earth radii mentioned on the same cited reddit post.
Smallest 	 	RS 0-4-3584-530-4095-5-30718-3985 5b 	1508.93 km (0.11842 D⊕) 	DeMooniC 	 	0.990 	
* Technically a natural satellite of a much larger companion, albeit SE still counts as a binary planet partners.
Largest terrestrial 	 	RS 0-2-41-887-4093-5-31336-2037 A1 	40216.86 km (3.1562 D⊕) 	Centri__ 	https://discord.com/channels/148933808811409408/1172270822585544804/1250536121343938621 	0.990 	
*It's also the most massive terrestrial, having a mass at least 0.31538 M♃.
Smallest gaseous planet 	 	RS 0-1-1-17-7611-2-0-162 B4 	3698.27 km (0.29024 D⊕) 	DeMooniC 	https://discord.com/channels/148933808811409408/1142480374774120488/1257284485423042571 	0.990 	
* It's also the least massive gaseous planet, having a mass at least 1.4425 M☾.
*However, the smallest "true" gas/ice giant, as stated by the discover himself is RSC 0-1-1-126-5761-0-0-71 A2, because fake gas/ice giants have no H2 and He atmo composition, a high atmo pressure above 1000 atm, a greenhouse effect of 1000 or fewer but never 0.https://discord.com/channels/148933808811409408/1142480374774120488/1257292313105793076
*The "planet" is so small, SE designated as a dwarf planet.
Most massive 	 	RS 0-2-22-560-4093-5-23138-1153 2b 	0.50564 M⊙ 	Centri__ 	https://www.reddit.com/r/spaceengine/comments/1605pcy/most_massive_planet_ever_found_050564x_the_mass/	0.990 	
Least massive 	 	RS 0-4-3584-530-4095-5-30718-3985 5b 	0.067434 M☾ 	DeMooniC 	https://discord.com/channels/148933808811409408/1172270822585544804/1245492665156501505 	0.990 	
*Technically a natural satellite of a much larger companion, albeit SE still counts as a binary planet partners.
*Least massive non-binary companion object is RS 0-4-3584-530-4095-6-258878-4394 A2, discovered by DeMooniC.https://discord.com/channels/148933808811409408/1172270822585544804/1245503002563842120
Most densest 	 	RS 0-2-22-560-4093-5-23138-1153 2b 	12016 g/cm³ 	Centri__ 	 	0.990 	
Least densest 	 	RS 0-0-0-520-4031-2-47-17 B1 	0.00023402 g/cm³ 	Cosmic Cross 	 	0.980 	RS 0-4-0-7-7606-2-54-2248 6 would be the least densest in 0.990, having a density of 0.055815 g/cm³, discovered by Centri__.https://discord.com/channels/148933808811409408/1142480374774120488/1240751653301391390
Highest surface gravity (terrestrial)	 	RS 0-3-339-2358-4093-5-31732-2067 1 	12.15 g 	plutoidfederalnavy	 	0.990 	
Highest surface gravity (gaseous) 	 	RS 0-2-22-560-4093-5-23138-1153 2b 	9281.5 g 	Centri__ 	 	0.990 	
Lowest surface gravity (terrestrial) 	 	 	 	 	 	 	
Lowest surface gravity (gaseous) 	 	RS 0-0-0-520-4031-2-47-17 B1 	0.0019377 g 	Cosmic Cross 	 	0.980 	
Most oblateness 	 	RS 0-3-397-1581-21762-6-208021-493 4a 	0.249 	Centri__ 	https://www.reddit.com/r/spaceengine/comments/12i02fy/most_extreme_stars_or_planets_found_in_latest/ 	0.990 	
*0.249 is the limit for oblate objects in SE 0.990 and 0.980
Hottest 	 	RS 0-1-5-1337-21653-0-0-2203 A2 	4824.6 °C 	Diamondskull 	https://discord.com/channels/148933808811409408/1142480374774120488/1184621098785058846 	0.990 	
*RS 0-1-0-9-7606-4-3510-7508 BC129 would be the hottest non-stellar object found, discovered by Diamondskull. It has the highest maximum temperature of 24581 °C and also has the highest average temperature of 15423 °C.https://www.reddit.com/r/spaceengine/comments/1dzcyi6/current_record_for_hottest_non_star_object_rs/
*RS 0-1-5-1337-3977-0-0-31 A2 would be the hottest planet if including maximum temperature of 5130.6 °C, discovered by Diamondskull.https://discord.com/channels/148933808811409408/1142480374774120488/1183898346490966147
Coldest 	 	RS 0-4-91-1538-4095-8-16702655-2 	-249.36 °C 	DeMooniC 	https://discord.com/channels/148933808811409408/1142480374774120488/1152890345219182724 	0.990 	
Hottest (with life) 	 	RS 0-1-7-477-11231-7-393113-48 4 	579.88 °C 	Diamondskull 	https://discord.com/channels/148933808811409408/1172270822585544804/1263188389608558736 	0.990 	
* Life cannot exist on torrid planets or moons, although it can exist if the torrid conditions are temporary.
Coldest (with life) 	 	RS 0-6-117026-2494-1828-7-2466-1833 6 	-226.98 °C 	DevNoiL6 	 	0.990 	
Longest rotational period 	 	 	 	 	 	 	
Shortest rotational period 	 	RS 0-2-22-560-4093-5-23138-1153 2b 	2ʰ58ᵐ58.87ˢ 	Centri__ 	 	0.990 	
Highest ESI 	 	RS 0-4-1729-365-2905-7-1548246-23 4 	ESI 0.9999711514 	Centri__ 	https://discord.com/channels/148933808811409408/1142480374774120488/1269860278842036327 	0.990 	
*Space Engine automatically rounds up planets and moons to 1.000 if they have an ESI higher than 0.9995.
*A few other planets and moons have been discovered with an ESI more than 0.9995 but never truly 1.000.
Lowest ESI 	 	RS 0-0-0-520-4031-2-47-17 B1 	ESI 0.012 	Cosmic Cross 	 	0.980 	
* RS 8513-2738-6-92475-296 9b would be the lowest ESI in 0.990 with an ESI of 0.015.https://discord.com/channels/148933808811409408/1142480374774120488/1148689818755272775
* Planets and moons with an ESI of 0.000 are believed to be impossible to achieve, as even an ESI of 0.0005 would round up into 0.001, although some asteroids and comets with specific properties can achieve very low ESIs.
Oldest 	 	RSC 1237-99-4-509-48 4 (Or 1234) 	12.870 Billion years 	Dragon 	 	0.990 	
* Not the only such old planet. It's just the maximum in Space Engine
Youngest 	 	RS 0-1-2-2082-18139-8-2455375-1291 	2.997 years 	Centri__ 	https://discord.com/channels/148933808811409408/1142480374774120488/1271414041398476810 	0.990 	
*The moons also shares the same age as the dwarf planet.
Highest axial tilt 	 	 	 	 	 	 	
Most moons 	 	RS 8409-3147-4-1883-287 1 	1023 	[deleted] 	https://www.reddit.com/r/spaceengine/comments/2yih8q/the_most_impressive_amount_of_moons_ive_seen1023/	0.972 	
*102-103 moons is the believed limit for objects with the most moons in 0.990. Planemos however, can have over 200 moons if asteroids are counted.
*The planet has 1023 moons in total, but only the first 74 are existant ingame.
Longest orbital period 	 	RS 0-1-1-1111-25195-8-6784764-277 2 	143775.003 years 	Centri__ 	https://discord.com/channels/148933808811409408/1142480374774120488/1249487147438837961 	0.990 	
Shortest orbital period 	 	 	 	 	 	 	
Most eccentric orbit 	 	 	 	 	 	 	
Most inclined orbit 	 	 	 	 	 	 	
Biggest rings 	 	RS 0-3-173-751-14498-8-9112670-1673 B4	~885,100 km 	Centri__ 	https://www.reddit.com/r/spaceengine/comments/rylaw6/the_new_largest_procedural_rings_version_099039/ 	0.990 	
*While not directly stated in-game, ring size can be found by using the planet editor.
*The rings are larger in 0.990.39.
Deepest ocean 	 	RS 0-2-15-200-4095-2-31-1700 A9.1 	820.16 km 	Centri__ 	https://www.reddit.com/r/spaceengine/comments/144cuu4/moon_with_82016km_deep_oceans_deepest_oceans/ 	0.990 	
Thickest atmosphere 	 	 	 	 	 	 	
Thinnest atmosphere 	 	RS 0-1-0-452-4095-5-32764-6156 A4.2 	2.147 x 10-11 atm 	DiamondSkull 	https://discord.com/channels/148933808811409408/1142480374774120488/1249465793306165392 	0.990 	
===Star Extremes===
Star characteristics
Title 	Star Image	SE code 	Data 	Discoverer 	Cite 	SE Version	Notes
Largest 	 	RS 0-0-0-1016-18121-0-0-178 	167.02 AU 	Nyctas 	https://www.reddit.com/r/spaceengine/comments/6wy1q7/the_biggest_star_ever_found_in_space_engine167_au/	0.980 	
*The size limit for stars in 0.990 is 39.85 AU.
Smallest 	 	RS 0-5-11117-1626-3161-8-3979259-594 	24396.59 km (0.017526 D⊙)	Cosmic Cross 	 	0.980 	
*This is the smallest known main-sequence star. Stellar remnants such as neutron stars and white dwarfs are much smaller.
Most massive 	 	RS 0-0-0-1016-18121-0-0-178 	300 M⊙ 	Nyctas 	 	0.980 	
*The mass limit for stars in 0.990 is 180 M⊙. The mass limit for stars in 0.980 is 320 M⊙
Least massive 	 	RS 9219-108592-8-4545359-40 	40.404 M♃ 	GapHappy7709 	https://www.reddit.com/r/spaceengine/comments/1df7fbp/how_is_this_star_considered_a_red_dwarf_when_its/	0.990 	
*This mass is below the hydrogen-fusing limit of around 79 M♃, which is required for objects to atleast be considered stars.
Densest 	 	 	 	 	 	 	
Lightest 	 	 	 	 	 	 	
Most oblateness 	 	RS 0-1-1-4-4014-0-0-273 AAB 	0.249 	Centri__ 	 	0.990 	
*0.249 is the limit for oblate objects in 0.990 and 0.980.
Hottest 	 	 	 	 	 	 	
Coldest 	 	 	 	 	 	 	
Longest rotational period 	 	 	 	 	 	 	
Shortest rotational period	 	 	 	 	 	 	
Highest Luminosity 	 	 	 	 	 	 	
Lowest Luminosity 	 	 	 	 	 	 	
Highest Metallicty 	 	 	 	 	 	 	
Lowest Metallicty 	 	 	 	 	 	 	
Oldest 	 	 	 	 	 	 	
Youngest 	 	RSC 0-0-0-31-6964-0-0-149 A 	71291.055 years 	HistoricalCod7415	https://www.reddit.com/r/spaceengine/comments/1emw1qv/an_extremely_young_red_supergiant_only_71000/ 	0.980 	
Highest axial tilt 	 	 	 	 	 	 	
Highest number of planets 	 	 	 	 	 	 	
Highest spectrum 	 	RSC 0-1-0-879-28171-0-0-0 S5 	O0 V 	AFGL 	https://discord.com/channels/148933808811409408/1142480374774120488/1270713903613087817 	0.990 	
Lowest spectrum 	 	RS 0-5-15540-2101-25215-8-10788648-204 B	Y9.9 V 	DevNoiL6 	 	0.990 	
===System Extremes===
System characteristics
Title 	Star Image	SE code 	Data 	Discoverer 	Cite 	SE Version 	Notes
Largest system diameter 	 	 	 	 	 	 	
Smallest system diameter 	 	 	 	 	 	 	
Highest system mass 	 	RS 0-1-0-3-4029-0-0-15 	540 M⊙	Centri__ 	https://discord.com/channels/148933808811409408/1142480374774120488/1240780206730379406 	0.990 	
*The system consists of a single star and 2 black holes, with all of them having 180 M⊙.
Lowest system mass 	 	 	 	 	 	 	
Most objects with life 	 	RS 0-1-2-964-1389-7-1476991-2757 	7 	SpaceBurger1	https://www.reddit.com/r/spaceengine/comments/1dwfwss/rarities_the_album_idk_what_im_doing/	0.990.45.1940	
*There are 7 objects with life only in 0.990.45.1940, newer SE versions of the system contains 6 life-bearing objects.
Shortest orbital period 	 	 	 	 	 	 	
Longest orbital period 	 	 	 	 	 	 	
Most eccentric orbit 	 	 	 	 	 	 	
Highest inclination orbit 	 	 	 	 	 	 	
Most number of stars 	 	 	8 	 	 	 	
*8 stars is the limit for systems with the most number of stars.
Highest total number of planets	 	RS 0-3-130-1422-3967-8-2785192-134	39 	Centri__ 	https://discord.com/channels/148933808811409408/1142480374774120488/1257005741227638876 	0.990 	
*The system consists of four stars, with AA having 8 planets, AB having 9 planets, BA having 10 planets and BB having 12 planets.
* The limit of planets orbiting singular planetary systems is 15.
===Galaxy Extremes===
Galaxy characteristics
Title 	Galaxy Image	SE Code 	Data 	Discoverer	Cite 	SE Version	Notes
Largest 	 	 	326.16 kly 	 	 	 	
*The maximum size for procedural galaxies in 0.990 and 0.980 is 326.16 kly, equivalent to 100,000 pc.
Smallest 	 	RG 0-9-26749-2409 	309.28 ly 	Centri__ 	https://discord.com/channels/148933808811409408/1142479475192365106/1250512653491634257	0.990 	
*309.28 ly is the limit for small galaxies in 0.990.
Smallest spiral galaxy	 	RG 0-9-78942122-632	2777.64 ly 	DeMooniC 	https://discord.com/channels/148933808811409408/1142480374774120488/1252769358422212779	0.990 	
Highest star count 	 	 	~25 trillion	 	 	0.990 	
*Procedural Elliptical E0 galaxies at max-size can have 25 trillion stars.
Lowest star count 	 	RG 0-9-45412165-564	8547 	DeMooniC 	https://discord.com/channels/148933808811409408/1142480374774120488/1266817798957699083	0.990 	
*SE incorrectly recognized the galaxy total star count as ~43000 in the infobox.
Most luminous 	 	 	 	 	 	 	
Least luminous 	 	 	 	 	 	 	
===Nebulae Extremes===
Nebulae characteristics
Title 	Nebula Image	SE Code 	Data 	Discoverer	Cite 	SE Version	Notes
Largest 	 	RN 0-4-310-719-989	342.63 ly	DeMooniC 	https://www.reddit.com/r/spaceengine/comments/1dp3mk6/a_nebula_30957_lightyears_wide_rn_0317310098736/	0.990 	
Smallest 	 	 	 	 	 	 	
Most luminous 	 	 	 	 	 	 	
Least luminous 	 	 	 	 	 	 	
Largest supernova remnant 	 	 	 	 	 	 	
Smallest supernova remnant	 	 	 	 	 	 	
Largest diffuse 	 	RN 0-4-310-719-989	378.28 ly	DeMooniC 	 	0.990 	
Smallest diffuse 	 	 	 	 	 	 	
Largest planetary 	 	 	 	 	 	 	
Smallest planetary 	 	 	 	 	 	 	
===Miscellaneous Extremes===
Characteristics
Title 	Image	SE Code 	Data 	Discoverer 	Cite 	SE Version	Notes
Thickest asteroid atmosphere 	 	RS 0-4-1754-1118-4095-8-16775455-6924 8.2 	0.001808 atm 	DeMooniC 	https://discord.com/channels/148933808811409408/1142480374774120488/1249457190427955340 	0.990 	
Largest black hole 	 	 	 	 	 	 	
Smallest black hole 	 	 	 	 	 	 	
Closest procedural object to Sun 	 	RS 8513-928-8-5906586-140 	8.04 ly 	Unknown 	 	0.990 	
*See also: List of closest procedural stars to the Sun
Most massive moon 	 	RS 0-2-21-1882-11263-7-963016-749 6.1 	4.2398 M♃ 	DiamondSkull 	https://www.reddit.com/r/spaceengine/comments/15vs1dk/most_massive_moon_discovered_in_space_engine_over/	0.990 	
Closest stars that are part of different systems	 	RSC 0-6-1-0-2215-0-0-496 	166.92 AU 	Centri__ (maybe?)	https://discord.com/channels/148933808811409408/1142479346058154035/1270657608746799106 	0.990 	
*It is a binary system consisting of a white main-sequence star and an orange dwarf. Its binary system neighbor, RSC 0-6-1-0-2215-0-0-533 consists of a white main-sequence star and a yellow dwarf.
Largest true asteroid 	 	 	 	 	 	 	
Smallest lacustrine 	 	RS 0-2-47-836-4093-8-12516041-371 B7.1 	1087.85 km (0.085375 D⊕)	Centri__ 	https://discord.com/channels/148933808811409408/1172270822585544804/1249055105035010088 	0.990 	
Most gas/ice giants moons 	 	RS 0-6-178643-80-1798-6-90518-527 9 	4 	DeMooniC 	https://discord.com/channels/148933808811409408/1142480374774120488/1247216158512382112 	0.990 	
Longest procedurally generated object code 	 	RS 0-8-16404865-10675-35-8-16561761-1420 AAA1-AAA1.1	52 	DiamondSkull 	https://discord.com/channels/148933808811409408/1142480374774120488/1252613722669842492 	0.990 	
*It is a barycenter, not a planet.
Longest solar day 	 	RS 0-4-1239-446-3951-8-16169032-843 5 	168.056 years 	DeMooniC 	https://www.reddit.com/r/spaceengine/comments/1ds7rwj/discovered_by_demoonic_this_icy_world_has_a_solar/	0.990 	
* Tidally locked worlds aren't included as they always have a solar day of ∞.
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