Inner Moons List

And one more system: Hegeia WZ-R b32-0 reported by cmdr. LordFerret.

I just came back from an exploration jaunt out through the Elysian Shore, where I discovered HEGEIA WZ-R B32-0. The second planet in this system is a Class 1 Gas Giant with a huge ring system. The A-ring I was able to map, but the B-ring was so far out from the planet that it was unreachable by map probes. This B-ring begins around 2.5ls out, beyond this planet's moon 'C', and extends out close to 5.0ls in total.


 
Wait a minute that's not a shepherd moon
Well, that would be rather unfortunate. Can you check orrery, please?

According to EDSM data it looks very-very-very much like that at least moon #1a should within the gap in GG's rings.

UPD. I've also checked it on the shepherd moons list and the first three moons (from #1a to #1c) appear to be in there.
 
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And while I'm slowly making my way to Col 107 Sector UY-Q b34-4, we have one more system reported by cmdr. Starsong: Eoch Blao AA-A h65 body #1 -- class K star with 28,6 million km. metal rich ring.
Found this, a K-class ringed star with a gas giant on an eccentric orbit and a landable planet inside the ring, all orbiting a black hole. System is Eoch Blao AA-A H65.


 
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Well, I'm here and I'm afraid, I have bad news: Col 107 Sector UY-Q b34-4 body #AB 3, despite being a planet with the largest currently known ring, is visually completely unremarkable. It's outer ring is not only invisible, but also even too sparse to be obstacle for a ship in supercruise mode, so it renders on the map, but is actually not there physically. Moreover, it is so dark in the system, that I had to "lit" the inner ring with dss probes to see it.






The next ring with radius of around 40 million km. is not very far, maybe I'll be more lucky this time ;)
 
There is a study on the question of rings visibility, made by cmdr. Gromsch. It shows, that there definitely is a connection between ring's density and visibility: the higher the density is, the more is the probability that the ring would be visible.

I've made a table of the confirmed planets with shepherd moons and sorted them by the density of the rings. And we can see, that invisible rings all have density of less than 46 tons* of material per km3, while the visible ones tend to have density of more than 46.

* Unless I lost a few zeros in the calculations :)

System nameRing mass (MT)Inner radius (MKm)Outer radius (MKm)Volume (Km3)DensityVisibility
Myriesly ZK-N d7-1528
1354300000​
0,75​
3​
26569207097073​
0,05No
Dryooe Blou XQ-K d9-48
19362600960​
1,9​
7,58​
169385228958349​
0,11No
Myriesly MX-A c27-7103
8995800000​
0,68​
4,29​
56436819545106​
0,16No
Myriesly ZJ-R c4-861
3717700000​
0,8​
2​
10572719726683​
0,35No
Phraa Prao HA-C c2-37
20064845824​
1,06​
4,25​
53169014672283​
0,38No
Dryaea Chraei NR-W d1-87
800344440832​
2,19​
22,08​
1516181577578050​
0,53No
Myriesly IB-D c26-4138
9780600000​
0,58​
2,32​
15881170390525​
0,62No
Myriesly NF-B c15-22
36994000000​
1,03​
4,08​
49027491041760​
0,75No
Dryaa Pruae BG-X d1-5664
603130000000​
1,16​
11,74​
428809829970984​
1,41No
Myriesly RD-Z c27-7159
175460000000​
1,42​
5,69​
95258310819672​
1,84No
Myriesly ID-I c23-1068
19259000000​
0,43​
1,74​
8879142544494​
2,17No
Myriesly NH-K c22-709
47449000000​
1,11​
2,79​
20671439475456​
2,30No
Myriesly IZ-I c9-2760
39869000000​
1,83​
2,89​
15774400857600​
2,53No
Myriesly QR-K c9-4422
46365000000​
1,03​
2,59​
17781228705240​
2,61No
Myriesly LC-D d12-7691
52292000000​
1,93​
3,07​
17839143567168​
2,93No
Myriesly UJ-X c28-4075
190040000000​
1,59​
4​
42324105905928​
4,49No
Dryooe Blou XQ-K d9-44
222112448512​
1,51​
3,82​
38532279942874​
5,76No
Col 107 Sector UY-Q b34-4
39905000000000​
7,13​
45,27​
6277787721232100​
6,36No
Myriesly YE-G c24-6222
156950000000​
0,56​
2,25​
14975323892889​
10,48No
Myriesly XJ-I d9-8271
7698700000000​
1,25​
12,59​
493380695392200​
15,60No
Bleia Flyuae YM-A d14-0
5895300000000​
2,78​
11,11​
363800213469000​
16,20No
Myriesly GQ-G d10-8313
2311400000000​
2,89​
7,29​
140709924104904​
16,43No
Dryooe Prou ZS-S b4-17
600512135168​
0,52​
3,19​
31122993864112​
19,29No
Sphaukee OB-X d1-3
940220000000​
1,7​
4,28​
48494499343752​
19,39No
Bleia Flyuae HR-U c19-3
1331600000000​
1,96​
4,9​
63569167109448​
20,95No
Eol Prou XJ-Q d5-1268
1468503556096​
1,21​
4,85​
69197587010482​
21,22No
Sphauloea FI-J d9-11
2340900000000​
4,61​
7,32​
101507201877312​
23,06No
Phroea Hype CM-C d24
6367400000000​
2,2​
8,78​
226805867223936​
28,07No
Myriesly ZJ-P c19-7678
2911700000000​
4,05​
6,43​
78325675178520​
37,17No
Phipue MA-X b15-21
1445378654208​
2,57​
4,07​
31459001059881​
45,94No
Skaudai KI-C b58-1
1272800000
0,64​
1,61​
6850552536773​
0,19Yes
Bleia Flyuae ZU-N d7-54
636030000
0,71​
1,12​
2397277211369​
0,27Yes
Qosoa AA-A h56
5297400000
1,66​
2,64​
13166142875424​
0,40Yes
Myriesly MY-Z c13-1205
8179900000
1,51​
2,38​
10724516111232​
0,76Yes
Myriesly BA-F c25-5957
3001700000
0,63​
1​
1880118668736​
1,60Yes
Myriesly LC-D d12-5390
6943700000
0,5​
1,26​
4182121967063​
1,66Yes
Pha Euhn WS-U d2-0
9806100000
0,73​
1,16​
2563896446034​
3,82Yes
Blae Flyuae OY-H d10-0
20993000000
0,48​
1,21​
3887990752800​
5,40Yes
Eol Prou GC-L d8-16
40211000000
1,07​
1,7​
5477143445928​
7,34Yes
Ooscs Freau ZY-S d3-1486
47867000000
0,99​
1,58​
4700286982831​
10,18Yes
Eorgh Prou TI-S d4-648
196560000000
1,47​
2,33​
10294155333000​
19,09Yes
Eol Prou QB-O c6-127
249402179584
1,27​
2,02​
7714590798760​
32,33Yes
Myriesly ZK-N d7-8615
341420000000
1,3​
2,06​
8073059746752​
42,29Yes
Myriesly XT-G c24-199
522660000000
1,55​
2,46​
11499634031424​
45,45Yes
Splierd UD-B D1
4220300000000​
1,26​
5,04​
74840982047832​
56,39Yes
Traikaae SN-X c28-61
2063300000000​
2,7​
4,28​
34764430377600​
59,35Yes
Bleia Flyuae XL-I b28-3
2424800000000​
2,91​
4,61​
40313211508416​
60,15Yes
LTT 16019
118540000000​
0,62​
0,98​
1817412835392​
65,22Yes
Syriae Thaa VB-B c27-0
3101800000000​
0,95​
3,8​
42477912783158​
73,02Yes
FLYIEDGE DG-N D7-56​
11173510512640​
2,82​
7,1​
13327677730276883,84Yes
Kyloanns TF-D d13-60
476310000000​
1,06​
1,68​
5346817217280​
89,08Yes
20127000000000​
2,16​
8,63​
21928667033196091,78Yes
Prooe Drye FH-J D10-68
4962300000000​
1,06​
4,25​
53188564746240​
93,30Yes
Schee Phio AW-C D82
89779000000000​
6,91​
17,42​
803382740793864​
111,75Yes
Stuemeae CC-D c12-5083
4550500000000​
2,88​
4,57​
39607073573760​
114,89Yes
Eol Prou QS-T D3-233
143620000000000​
15,75​
25,01​
1184832533623200​
121,22Yes
2MASS J18190744-1640266
287310000000000​
4,35​
27,62​
2336324837843300​
122,98Yes
Slaiyooe CB-X d1-5
12619000000000​
0,89​
5,66​
98132911956840​
128,59Yes
Myriesly EC-B c27-4778
2643200000000​
1,97​
3,13​
18515026417272​
142,76Yes
NGC 7822 Sector BQ-Y d12
9476600000000​
0,72​
4,54​
63280872898449​
149,75Yes
Bleia Flyuae RZ-F c11-3
15065000000000​
0,55​
5,53​
95199537579633​
158,25Yes
Myriesly FC-B c27-2972
1688000000000​
1,5​
2,37​
10626697620000​
158,85Yes
Hypuae Audst TT-R e4-567
55794000000000​
8,4​
13,31​
334629756923616​
166,73Yes
Eoch Pruae EH-U d3-3099
535540000000​
0,76​
1,2​
2727339646564​
196,36Yes
Wepae AA-A h22
758580000000000​
27,46​
43,6​
3601240132089600​
210,64Yes
Eol Prou QI-B e1809
10666000000000​
1,52​
3,84​
38941707983640​
273,90Yes
Bleia Flyuae IR-M d7-4
106040000000000​
1,78​
11,22​
385635593250600​
274,97Yes
Scheau Byoe DB-U d4-1013
569740000000000​
20,77​
32,97​
2059437122080800​
276,65Yes
Myriesly FM-L c21-6944
1289300000000​
0,53​
1,32​
4643326750099​
277,67Yes
Syrivai UY-R d4-67
623760000000000​
5,78​
23,13​
1575968492430020​
395,79Yes
Ploi Aim BP-A D198
44557693616128​
0,94​
3,69​
40050037607735​
1112,55Yes
Alnitak
2664200000000000​
4,08​
25,57​
2001847099833500​
1330,87Yes
Byoi Eurk LM-W e1-10
448750000000000​
4,47​
11,2​
331057085389800​
1355,51Yes
Phrio Byoe BV-V d3-1536
836670000000000​
9,02​
14,31​
388134913362504​
2155,62Yes
Eoch Blao AA-A h65
10149000000000000​
11,39​
28,7​
2179849058032800​
4655,83Yes
Mylaifa AA-A h786
10950000000000000​
19,3​
30,64​
1778978350195200​
6155,22Yes

However, we can't just say, that all sparse rings are invisible, for we have a few examples of the contrary (I've marked them in the table by red font).

For instance, the overall density of the outer ring of Cúpla Iontach is very low, but the material is condensed in a collection of several thin dense and visible separate rings.

The same is true for one of the most beautiful rings I've seen -- the outer ring of the Poseidon's Fury

And for The Rejected Child

And, to be completely honest, for all known visible large and sparse rings of planets with shepherd moons:

On the other hand dense rings seem to be more often rendered as one piece. Here are some examples from the end of the table:

What do we have in the end.
1) We can calculate the ring's density from the EDSM data and if that density is above some margin, it is very highly likely that the system would provide us with some nice views :)

2) If you see a large ring made of several thin concentric rings -- it's overall density would probably be low, and if the ring is rendered in one piece, it is probably dense (have no idea how can that be of any practical use :) )

3) If the density of the ring is below the margin, there still actually is a chance that the ring is visible, however I don't know how we can guesstimate it from the list without flying and checking :)
 
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I've checked two more systems with large rings with the same result: they are too sparse to be visible.

Col 89 Sector NZ-L b10-1 body #ABC 5 is so dark, that even the inner ring is barely visible and 35,6MKm outer ring is seen only on the map.

Synuefuae RY-S d3-0 body #AB 1 is on the contrary rather bright, however that didn't help much: I still didn't manage to find any trace of it's 36,5 MKm outer ring.
 
Have no idea how I came across the address of that system, for it is definitely not in the list of shepherd moons. But still here it is -- a nice-looking "false positive" in Swoilz IT-O d7-77. It has three rings with a gap among them and a relatively close moon.



But nope, not this time ;)
 
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Have no idea how I came across the address of that system, for it is definitely not in the list of shepherd moons. But still here it is -- a nice-looking "false positive" in Swoilz IT-O d7-77. It has three rings with a gap among them and a relatively close moon.



But nope, not this time ;)
By the looks of it (and in my experience), another buggy feature, the three rings.
In game graphics & system map show 3 rings, the system map even lists A, B & C, but for the orrery & DSS the C ring doesn't exist as a separate entity.
 
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