Star System Generated (Seed: 1767216953)
Star Details
Spectral Class: M9V
Temperature: 2,400 K
Mass: 0.27 sol
Luminosity: 0.01 lux
Habitable Zone (HZ)
Inner Boundary: 0.1 AU
Outer Boundary: 0.14 AU
Physical Limits
Snow Line: 0.48 AU
Max System Radius: 10.4 AU
Planetary System (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.69 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 450.3
Radius: 14.4
Gravity: 2.17 G
Time & Orbit
Eccentricity (e): 0.055
Orbit Range: 0.65 AU - 0.73 AU
Year: 403 Days
Day: 5.1 Hours
Environment
Temp: -163 °C
Axial Tilt: 28.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (33)
Outer Limit: 45,879,095 km
- M1: 179,517 km (0.081 R)
- M2: 287,826 km (0.077 R)
- M3: 418,425 km (0.049 R)
- M4: 524,490 km (0.073 R)
- M5: 652,845 km (0.068 R)
- M6: 744,399 km (0.102 R)
- M7: 939,026 km (0.062 R)
- M8: 1,053,468 km (0.08 R)
- M9: 1,152,053 km (0.038 R)
- M10: 1,315,115 km (0.118 R)
- M11: 1,472,791 km (0.062 R)
- M12: 1,565,841 km (0.099 R)
- M13: 1,675,347 km (0.038 R)
- M14: 1,907,971 km (0.058 R)
- M15: 2,010,147 km (0.06 R)
- M16: 2,140,746 km (0.109 R)
- M17: 2,231,252 km (0.109 R)
- M18: 2,350,332 km (0.063 R)
- M19: 2,493,946 km (0.098 R)
- M20: 2,600,909 km (0.035 R)
- M21: 2,848,643 km (0.09 R)
- M22: 3,002,280 km (0.072 R)
- M23: 3,152,626 km (0.108 R)
- M24: 3,274,847 km (0.077 R)
- M25: 3,530,360 km (0.062 R)
- M26: 3,715,263 km (0.096 R)
- M27: 3,805,620 km (0.118 R)
- M28: 4,008,475 km (0.098 R)
- M29: 4,127,854 km (0.116 R)
- M30: 4,241,848 km (0.094 R)
- M31: 4,363,620 km (0.046 R)
- M32: 4,631,700 km (0.096 R)
- M33: 4,785,337 km (0.117 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.88 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 632.7
Radius: 13.1
Gravity: 3.69 G
Time & Orbit
Eccentricity (e): 0.106
Orbit Range: 0.79 AU - 0.97 AU
Year: 580 Days
Day: 9.6 Hours
Environment
Temp: -172 °C
Axial Tilt: 29.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (45)
Outer Limit: 45,879,095 km
- M1: 163,510 km (0.075 R)
- M2: 258,356 km (0.116 R)
- M3: 353,649 km (0.109 R)
- M4: 439,967 km (0.09 R)
- M5: 536,308 km (0.098 R)
- M6: 620,981 km (0.104 R)
- M7: 711,039 km (0.062 R)
- M8: 811,120 km (0.116 R)
- M9: 897,138 km (0.101 R)
- M10: 991,684 km (0.08 R)
- M11: 1,137,692 km (0.063 R)
- M12: 1,241,214 km (0.052 R)
- M13: 1,388,418 km (0.072 R)
- M14: 1,511,686 km (0.093 R)
- M15: 1,632,861 km (0.093 R)
- M16: 1,732,194 km (0.088 R)
- M17: 1,827,338 km (0.108 R)
- M18: 1,924,277 km (0.092 R)
- M19: 2,029,594 km (0.057 R)
- M20: 2,322,806 km (0.061 R)
- M21: 2,478,238 km (0.12 R)
- M22: 2,571,737 km (0.113 R)
- M23: 2,710,713 km (0.119 R)
- M24: 2,822,164 km (0.101 R)
- M25: 2,965,628 km (0.1 R)
- M26: 3,096,078 km (0.099 R)
- M27: 3,515,251 km (0.044 R)
- M28: 3,637,173 km (0.091 R)
- M29: 3,727,530 km (0.118 R)
- M30: 3,827,013 km (0.104 R)
- M31: 4,233,919 km (0.057 R)
- M32: 4,355,392 km (0.092 R)
- M33: 4,442,758 km (0.062 R)
- M34: 4,798,352 km (0.097 R)
- M35: 4,961,413 km (0.083 R)
- M36: 5,089,469 km (0.059 R)
- M37: 5,246,547 km (0.11 R)
- M38: 5,405,270 km (0.059 R)
- M39: 5,613,062 km (0.081 R)
- M40: 5,727,504 km (0.088 R)
- M41: 5,833,120 km (0.038 R)
- M42: 6,085,342 km (0.047 R)
- M43: 6,540,569 km (0.075 R)
- M44: 6,681,340 km (0.063 R)
- M45: 6,874,022 km (0.101 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.1 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 98.5
Radius: 8.4
Gravity: 1.4 G
Time & Orbit
Eccentricity (e): 0.112
Orbit Range: 0.98 AU - 1.22 AU
Year: 811 Days
Day: 6.9 Hours
Environment
Temp: -180 °C
Axial Tilt: 11 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (35)
Outer Limit: 45,879,095 km
- M1: 105,616 km (0.107 R)
- M2: 239,207 km (0.117 R)
- M3: 307,723 km (0.096 R)
- M4: 537,655 km (0.07 R)
- M5: 693,386 km (0.087 R)
- M6: 937,231 km (0.094 R)
- M7: 1,016,518 km (0.112 R)
- M8: 1,110,615 km (0.115 R)
- M9: 1,173,595 km (0.12 R)
- M10: 1,316,611 km (0.115 R)
- M11: 1,392,607 km (0.071 R)
- M12: 1,474,736 km (0.089 R)
- M13: 1,535,024 km (0.062 R)
- M14: 1,600,996 km (0.093 R)
- M15: 1,889,571 km (0.101 R)
- M16: 2,011,643 km (0.087 R)
- M17: 2,173,358 km (0.103 R)
- M18: 2,274,636 km (0.084 R)
- M19: 2,372,024 km (0.11 R)
- M20: 2,621,703 km (0.094 R)
- M21: 2,897,412 km (0.114 R)
- M22: 2,991,509 km (0.113 R)
- M23: 3,104,455 km (0.06 R)
- M24: 3,206,780 km (0.111 R)
- M25: 3,261,383 km (0.111 R)
- M26: 3,359,220 km (0.098 R)
- M27: 3,458,104 km (0.092 R)
- M28: 3,671,581 km (0.077 R)
- M29: 3,767,024 km (0.064 R)
- M30: 3,850,500 km (0.06 R)
- M31: 4,006,231 km (0.109 R)
- M32: 4,451,883 km (0.096 R)
- M33: 4,553,909 km (0.076 R)
- M34: 4,629,157 km (0.068 R)
- M35: 4,684,209 km (0.094 R)
Planet 4 - Gas Giant
Semi-Major Axis: 5.02 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 925.8
Radius: 11.2
Gravity: 7.38 G
Time & Orbit
Eccentricity (e): 0.147
Orbit Range: 4.28 AU - 5.76 AU
Year: 7906 Days
Day: 13.9 Hours
Environment
Temp: -218 °C
Axial Tilt: 36.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (86)
Outer Limit: 45,879,095 km
- M1: 184,454 km (0.119 R)
- M2: 385,813 km (0.074 R)
- M3: 487,240 km (0.073 R)
- M4: 905,217 km (0.108 R)
- M5: 1,219,522 km (0.105 R)
- M6: 1,441,226 km (0.118 R)
- M7: 1,742,666 km (0.097 R)
- M8: 1,947,166 km (0.03 R)
- M9: 2,183,830 km (0.055 R)
- M10: 2,922,694 km (0.113 R)
- M11: 3,003,327 km (0.057 R)
- M12: 3,418,012 km (0.118 R)
- M13: 3,589,003 km (0.08 R)
- M14: 3,850,948 km (0.059 R)
- M15: 4,119,177 km (0.056 R)
- M16: 4,209,983 km (0.102 R)
- M17: 4,455,473 km (0.052 R)
- M18: 5,517,020 km (0.119 R)
- M19: 5,752,038 km (0.105 R)
- M20: 5,956,239 km (0.097 R)
- M21: 6,725,023 km (0.113 R)
- M22: 8,163,705 km (0.093 R)
- M23: 8,278,148 km (0.079 R)
- M24: 8,393,338 km (0.072 R)
- M25: 8,547,574 km (0.067 R)
- M26: 9,573,217 km (0.096 R)
- M27: 11,825,412 km (0.096 R)
- M28: 11,955,114 km (0.065 R)
- M29: 12,303,527 km (0.065 R)
- M30: 13,278,756 km (0.089 R)
- M31: 13,821,198 km (0.105 R)
- M32: 14,417,046 km (0.069 R)
- M33: 14,974,448 km (0.039 R)
- M34: 15,255,841 km (0.053 R)
- M35: 15,397,211 km (0.084 R)
- M36: 15,538,880 km (0.081 R)
- M37: 16,254,407 km (0.096 R)
- M38: 16,785,928 km (0.104 R)
- M39: 17,176,080 km (0.073 R)
- M40: 17,274,066 km (0.101 R)
- M41: 17,569,223 km (0.087 R)
- M42: 18,968,561 km (0.091 R)
- M43: 19,120,553 km (0.073 R)
- M44: 19,528,057 km (0.066 R)
- M45: 20,455,265 km (0.081 R)
- M46: 20,663,355 km (0.109 R)
- M47: 20,924,254 km (0.119 R)
- M48: 21,291,517 km (0.111 R)
- M49: 21,502,450 km (0.075 R)
- M50: 21,713,832 km (0.105 R)
- M51: 22,138,989 km (0.083 R)
- M52: 23,976,200 km (0.08 R)
- M53: 25,974,379 km (0.055 R)
- M54: 26,312,620 km (0.11 R)
- M55: 26,538,812 km (0.102 R)
- M56: 26,652,207 km (0.089 R)
- M57: 27,221,577 km (0.071 R)
- M58: 27,336,019 km (0.075 R)
- M59: 28,198,750 km (0.091 R)
- M60: 29,774,015 km (0.104 R)
- M61: 29,891,899 km (0.107 R)
- M62: 30,364,777 km (0.112 R)
- M63: 30,602,189 km (0.095 R)
- M64: 31,497,832 km (0.095 R)
- M65: 31,617,809 km (0.067 R)
- M66: 31,858,512 km (0.097 R)
- M67: 32,341,564 km (0.115 R)
- M68: 32,644,649 km (0.08 R)
- M69: 33,131,590 km (0.097 R)
- M70: 33,928,049 km (0.063 R)
- M71: 35,041,207 km (0.114 R)
- M72: 35,477,285 km (0.051 R)
- M73: 36,292,144 km (0.063 R)
- M74: 37,366,855 km (0.053 R)
- M75: 37,684,900 km (0.118 R)
- M76: 38,131,749 km (0.055 R)
- M77: 38,837,552 km (0.069 R)
- M78: 39,030,683 km (0.105 R)
- M79: 39,677,095 km (0.111 R)
- M80: 40,196,798 km (0.112 R)
- M81: 40,653,371 km (0.106 R)
- M82: 41,571,603 km (0.091 R)
- M83: 41,703,398 km (0.077 R)
- M84: 42,562,988 km (0.099 R)
- M85: 43,897,102 km (0.083 R)
- M86: 44,838,970 km (0.095 R)
Planet 5 - Ice Giant
Semi-Major Axis: 6.88 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 22.6
Radius: 5.9
Gravity: 0.65 G
Time & Orbit
Eccentricity (e): 0.203
Orbit Range: 5.48 AU - 8.28 AU
Year: 12685 Days
Day: 17.9 Hours
Environment
Temp: -226 °C
Axial Tilt: 28.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (50)
Outer Limit: 45,879,095 km
- M1: 176,077 km (0.078 R)
- M2: 590,463 km (0.106 R)
- M3: 763,996 km (0.108 R)
- M4: 953,387 km (0.062 R)
- M5: 1,043,595 km (0.057 R)
- M6: 1,501,065 km (0.082 R)
- M7: 1,618,350 km (0.087 R)
- M8: 1,775,428 km (0.099 R)
- M9: 2,013,737 km (0.091 R)
- M10: 2,182,932 km (0.094 R)
- M11: 2,316,074 km (0.093 R)
- M12: 2,356,615 km (0.1 R)
- M13: 3,185,088 km (0.027 R)
- M14: 3,459,152 km (0.055 R)
- M15: 4,209,983 km (0.117 R)
- M16: 4,697,672 km (0.092 R)
- M17: 5,274,223 km (0.115 R)
- M18: 5,345,581 km (0.103 R)
- M19: 5,417,388 km (0.092 R)
- M20: 5,799,161 km (0.113 R)
- M21: 6,227,311 km (0.058 R)
- M22: 6,302,857 km (0.08 R)
- M23: 6,665,632 km (0.112 R)
- M24: 7,074,633 km (0.103 R)
- M25: 7,491,562 km (0.102 R)
- M26: 7,794,348 km (0.11 R)
- M27: 7,977,905 km (0.11 R)
- M28: 8,307,918 km (0.054 R)
- M29: 8,453,626 km (0.072 R)
- M30: 8,621,176 km (0.083 R)
- M31: 8,789,922 km (0.084 R)
- M32: 9,087,771 km (0.069 R)
- M33: 9,890,813 km (0.062 R)
- M34: 10,133,909 km (0.067 R)
- M35: 10,558,618 km (0.105 R)
- M36: 10,739,033 km (0.106 R)
- M37: 11,011,750 km (0.072 R)
- M38: 12,195,966 km (0.074 R)
- M39: 12,361,721 km (0.091 R)
- M40: 12,743,195 km (0.111 R)
- M41: 13,542,198 km (0.091 R)
- M42: 14,009,691 km (0.111 R)
- M43: 14,232,891 km (0.118 R)
- M44: 14,332,523 km (0.12 R)
- M45: 14,859,108 km (0.105 R)
- M46: 16,242,439 km (0.102 R)
- M47: 16,424,649 km (0.082 R)
- M48: 16,476,859 km (0.054 R)
- M49: 16,529,218 km (0.115 R)
- M50: 17,559,349 km (0.069 R)
Planet 6 - Ice Giant
Semi-Major Axis: 7.12 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 98.2
Radius: 6.9
Gravity: 2.06 G
Time & Orbit
Eccentricity (e): 0.207
Orbit Range: 5.65 AU - 8.59 AU
Year: 13355 Days
Day: 20.7 Hours
Environment
Temp: -226 °C
Axial Tilt: 2.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 45,879,095 km
- M1: 130,749 km (0.104 R)
- M2: 178,171 km (0.108 R)
- M3: 404,812 km (0.069 R)
- M4: 509,530 km (0.044 R)
- M5: 733,927 km (0.085 R)
- M6: 785,090 km (0.084 R)
- M7: 2,212,253 km (0.118 R)
- M8: 2,441,288 km (0.047 R)
- M9: 2,860,461 km (0.079 R)
- M10: 2,963,683 km (0.059 R)
- M11: 4,084,471 km (0.111 R)
- M12: 4,224,195 km (0.112 R)
- M13: 4,294,656 km (0.108 R)
- M14: 4,532,516 km (0.102 R)
- M15: 4,798,950 km (0.11 R)
- M16: 5,398,090 km (0.12 R)
- M17: 5,525,846 km (0.063 R)
- M18: 5,654,650 km (0.113 R)
- M19: 5,967,908 km (0.046 R)
- M20: 6,179,888 km (0.099 R)
- M21: 6,340,407 km (0.112 R)
- M22: 6,421,339 km (0.053 R)
- M23: 6,529,648 km (0.115 R)
- M24: 7,192,067 km (0.107 R)
- M25: 7,702,944 km (0.112 R)
- M26: 7,933,773 km (0.094 R)
- M27: 8,196,168 km (0.064 R)
- M28: 8,254,811 km (0.093 R)
- M29: 8,431,785 km (0.108 R)
- M30: 9,182,467 km (0.08 R)
- M31: 10,142,885 km (0.1 R)
- M32: 10,205,866 km (0.064 R)
- M33: 10,747,111 km (0.113 R)
- M34: 10,940,391 km (0.096 R)
- M35: 11,297,631 km (0.106 R)
- M36: 12,123,860 km (0.116 R)
- M37: 12,291,410 km (0.112 R)
- M38: 12,595,094 km (0.118 R)
- M39: 12,798,846 km (0.101 R)
- M40: 13,106,569 km (0.093 R)
- M41: 13,764,051 km (0.118 R)
- M42: 14,788,348 km (0.063 R)
- M43: 15,111,330 km (0.083 R)
- M44: 15,472,758 km (0.052 R)
- M45: 15,618,167 km (0.055 R)
- M46: 15,691,021 km (0.1 R)
- M47: 15,873,680 km (0.08 R)
- M48: 16,536,997 km (0.105 R)
- M49: 16,872,097 km (0.103 R)
- M50: 17,134,342 km (0.054 R)
- M51: 17,738,717 km (0.093 R)
- M52: 18,542,506 km (0.079 R)
- M53: 20,903,610 km (0.114 R)
- M54: 21,024,186 km (0.096 R)
- M55: 21,508,583 km (0.079 R)
- M56: 23,025,207 km (0.064 R)
- M57: 23,399,351 km (0.08 R)
- M58: 24,873,339 km (0.034 R)
- M59: 26,768,594 km (0.114 R)
- M60: 26,943,175 km (0.075 R)
- M61: 27,205,719 km (0.087 R)
- M62: 27,557,125 km (0.11 R)
- M63: 27,689,369 km (0.066 R)
- M64: 27,733,500 km (0.088 R)
- M65: 28,264,573 km (0.071 R)
- M66: 28,397,865 km (0.12 R)
- M67: 28,754,356 km (0.089 R)
- M68: 29,291,861 km (0.089 R)
- M69: 29,336,741 km (0.078 R)
- M70: 29,426,799 km (0.082 R)
- M71: 29,471,828 km (0.098 R)
- M72: 29,697,122 km (0.118 R)
- M73: 30,285,939 km (0.076 R)
Planet 7 - Ice Giant
Semi-Major Axis: 8.62 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 189.8
Radius: 5.9
Gravity: 5.45 G
Time & Orbit
Eccentricity (e): 0.006
Orbit Range: 8.57 AU - 8.67 AU
Year: 17790 Days
Day: 24.6 Hours
Environment
Temp: -237 °C
Axial Tilt: 13.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (93)
Outer Limit: 45,879,095 km
- M1: 133,591 km (0.054 R)
- M2: 287,976 km (0.069 R)
- M3: 373,247 km (0.113 R)
- M4: 570,267 km (0.099 R)
- M5: 746,643 km (0.084 R)
- M6: 815,009 km (0.093 R)
- M7: 867,817 km (0.07 R)
- M8: 995,424 km (0.104 R)
- M9: 1,372,411 km (0.108 R)
- M10: 1,631,814 km (0.113 R)
- M11: 1,721,722 km (0.047 R)
- M12: 2,073,426 km (0.099 R)
- M13: 2,472,853 km (0.092 R)
- M14: 2,576,375 km (0.105 R)
- M15: 3,227,574 km (0.089 R)
- M16: 3,283,972 km (0.102 R)
- M17: 3,369,393 km (0.069 R)
- M18: 3,513,306 km (0.094 R)
- M19: 3,747,726 km (0.046 R)
- M20: 4,262,941 km (0.037 R)
- M21: 4,703,656 km (0.059 R)
- M22: 4,962,012 km (0.104 R)
- M23: 5,093,060 km (0.084 R)
- M24: 5,158,883 km (0.114 R)
- M25: 5,391,806 km (0.11 R)
- M26: 6,006,504 km (0.09 R)
- M27: 6,322,006 km (0.105 R)
- M28: 7,042,619 km (0.1 R)
- M29: 7,826,961 km (0.111 R)
- M30: 8,403,960 km (0.116 R)
- M31: 8,875,492 km (0.091 R)
- M32: 8,994,722 km (0.092 R)
- M33: 9,154,492 km (0.101 R)
- M34: 10,845,696 km (0.105 R)
- M35: 10,973,153 km (0.112 R)
- M36: 11,015,789 km (0.077 R)
- M37: 11,058,424 km (0.09 R)
- M38: 11,531,303 km (0.063 R)
- M39: 12,854,347 km (0.112 R)
- M40: 12,989,134 km (0.063 R)
- M41: 13,533,671 km (0.056 R)
- M42: 13,625,075 km (0.083 R)
- M43: 13,670,852 km (0.097 R)
- M44: 14,691,558 km (0.113 R)
- M45: 17,299,049 km (0.11 R)
- M46: 17,597,497 km (0.113 R)
- M47: 17,997,970 km (0.119 R)
- M48: 19,578,322 km (0.058 R)
- M49: 20,045,367 km (0.039 R)
- M50: 20,149,636 km (0.098 R)
- M51: 22,327,033 km (0.049 R)
- M52: 23,087,589 km (0.107 R)
- M53: 23,306,451 km (0.064 R)
- M54: 24,077,777 km (0.085 R)
- M55: 24,244,130 km (0.054 R)
- M56: 24,299,631 km (0.077 R)
- M57: 24,355,281 km (0.096 R)
- M58: 25,025,480 km (0.094 R)
- M59: 25,081,729 km (0.1 R)
- M60: 25,194,077 km (0.065 R)
- M61: 26,156,141 km (0.078 R)
- M62: 26,727,754 km (0.067 R)
- M63: 26,842,645 km (0.094 R)
- M64: 27,419,046 km (0.095 R)
- M65: 28,995,957 km (0.062 R)
- M66: 29,468,686 km (0.06 R)
- M67: 29,825,028 km (0.075 R)
- M68: 31,023,008 km (0.072 R)
- M69: 31,083,296 km (0.096 R)
- M70: 31,688,569 km (0.088 R)
- M71: 31,870,929 km (0.097 R)
- M72: 32,175,660 km (0.081 R)
- M73: 32,665,144 km (0.111 R)
- M74: 33,218,656 km (0.079 R)
- M75: 33,280,440 km (0.108 R)
- M76: 34,086,024 km (0.095 R)
- M77: 34,460,019 km (0.085 R)
- M78: 34,647,465 km (0.1 R)
- M79: 35,338,009 km (0.117 R)
- M80: 36,413,917 km (0.073 R)
- M81: 36,604,804 km (0.088 R)
- M82: 36,732,411 km (0.081 R)
- M83: 37,179,858 km (0.11 R)
- M84: 37,308,063 km (0.117 R)
- M85: 39,378,648 km (0.093 R)
- M86: 39,509,396 km (0.106 R)
- M87: 40,164,784 km (0.07 R)
- M88: 41,088,402 km (0.119 R)
- M89: 41,220,945 km (0.115 R)
- M90: 41,685,895 km (0.108 R)
- M91: 42,219,361 km (0.101 R)
- M92: 44,784,217 km (0.091 R)
- M93: 45,193,666 km (0.095 R)
Kuiper Belt
Range: 30 - 51 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 296 - 14,931 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.