Star System Generated (Seed: 1767245420)
Star Details
Spectral Class: M1V
Temperature: 3,483 K
Mass: 0.32 sol
Luminosity: 0.02 lux
Habitable Zone (HZ)
Inner Boundary: 0.13 AU
Outer Boundary: 0.19 AU
Physical Limits
Snow Line: 0.68 AU
Max System Radius: 11.3 AU
Planetary System (8 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.65 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.88
Radius: 1.53
Gravity: 1.23 G
Time & Orbit
Eccentricity (e): 0.114
Orbit Range: 0.58 AU - 0.72 AU
Year: 338 Days
Day: 24.2 Hours
Environment
Temp: -134 °C
Axial Tilt: 36 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 2 - Gas Giant
Semi-Major Axis: 0.76 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 465
Radius: 13.8
Gravity: 2.44 G
Time & Orbit
Eccentricity (e): 0.008
Orbit Range: 0.75 AU - 0.77 AU
Year: 428 Days
Day: 9.8 Hours
Environment
Temp: -151 °C
Axial Tilt: 10 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (33)
Outer Limit: 42,540,994 km
- M1: 180,714 km (0.085 R)
- M2: 269,875 km (0.091 R)
- M3: 381,325 km (0.095 R)
- M4: 545,733 km (0.052 R)
- M5: 671,694 km (0.055 R)
- M6: 794,215 km (0.071 R)
- M7: 909,705 km (0.093 R)
- M8: 1,077,553 km (0.031 R)
- M9: 1,247,497 km (0.093 R)
- M10: 1,408,165 km (0.098 R)
- M11: 1,503,309 km (0.118 R)
- M12: 1,690,306 km (0.114 R)
- M13: 1,848,880 km (0.116 R)
- M14: 1,991,148 km (0.088 R)
- M15: 2,082,702 km (0.064 R)
- M16: 2,320,861 km (0.077 R)
- M17: 2,417,502 km (0.085 R)
- M18: 2,638,757 km (0.116 R)
- M19: 2,752,002 km (0.076 R)
- M20: 2,885,145 km (0.049 R)
- M21: 2,977,147 km (0.034 R)
- M22: 3,088,897 km (0.075 R)
- M23: 3,240,290 km (0.089 R)
- M24: 3,329,600 km (0.081 R)
- M25: 3,596,482 km (0.027 R)
- M26: 3,762,686 km (0.051 R)
- M27: 3,951,927 km (0.047 R)
- M28: 4,123,516 km (0.113 R)
- M29: 4,424,656 km (0.058 R)
- M30: 4,631,849 km (0.115 R)
- M31: 4,754,819 km (0.056 R)
- M32: 4,893,646 km (0.077 R)
- M33: 5,033,819 km (0.085 R)
Planet 3 - Gas Giant
Semi-Major Axis: 0.92 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 585.4
Radius: 9.2
Gravity: 6.92 G
Time & Orbit
Eccentricity (e): 0.027
Orbit Range: 0.9 AU - 0.94 AU
Year: 570 Days
Day: 7.5 Hours
Environment
Temp: -147 °C
Axial Tilt: 9.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (52)
Outer Limit: 42,540,994 km
- M1: 114,592 km (0.065 R)
- M2: 352,602 km (0.035 R)
- M3: 435,479 km (0.057 R)
- M4: 499,058 km (0.106 R)
- M5: 641,176 km (0.089 R)
- M6: 733,478 km (0.106 R)
- M7: 802,293 km (0.092 R)
- M8: 912,397 km (0.115 R)
- M9: 1,235,080 km (0.049 R)
- M10: 1,296,116 km (0.093 R)
- M11: 1,409,661 km (0.101 R)
- M12: 1,586,485 km (0.075 R)
- M13: 1,689,858 km (0.096 R)
- M14: 1,751,791 km (0.115 R)
- M15: 2,040,216 km (0.117 R)
- M16: 2,146,430 km (0.078 R)
- M17: 2,234,095 km (0.078 R)
- M18: 2,323,105 km (0.119 R)
- M19: 2,441,138 km (0.095 R)
- M20: 2,525,810 km (0.056 R)
- M21: 2,597,019 km (0.077 R)
- M22: 2,683,487 km (0.11 R)
- M23: 2,851,934 km (0.112 R)
- M24: 3,183,742 km (0.082 R)
- M25: 3,299,830 km (0.102 R)
- M26: 3,370,141 km (0.118 R)
- M27: 3,480,394 km (0.104 R)
- M28: 3,704,791 km (0.112 R)
- M29: 3,859,775 km (0.118 R)
- M30: 3,933,975 km (0.106 R)
- M31: 4,016,852 km (0.115 R)
- M32: 4,092,100 km (0.119 R)
- M33: 4,150,892 km (0.098 R)
- M34: 4,303,482 km (0.065 R)
- M35: 4,380,375 km (0.082 R)
- M36: 4,483,747 km (0.047 R)
- M37: 4,544,484 km (0.119 R)
- M38: 4,622,873 km (0.082 R)
- M39: 4,701,711 km (0.111 R)
- M40: 4,789,825 km (0.069 R)
- M41: 5,066,730 km (0.113 R)
- M42: 5,175,189 km (0.086 R)
- M43: 5,266,294 km (0.09 R)
- M44: 5,580,001 km (0.073 R)
- M45: 5,654,650 km (0.054 R)
- M46: 5,748,597 km (0.103 R)
- M47: 6,014,134 km (0.058 R)
- M48: 6,071,579 km (0.085 R)
- M49: 6,158,047 km (0.109 R)
- M50: 6,312,881 km (0.046 R)
- M51: 6,468,911 km (0.044 R)
- M52: 6,596,668 km (0.1 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.06 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 885.2
Radius: 11.1
Gravity: 7.18 G
Time & Orbit
Eccentricity (e): 0.189
Orbit Range: 0.86 AU - 1.26 AU
Year: 705 Days
Day: 5.7 Hours
Environment
Temp: -159 °C
Axial Tilt: 1.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (51)
Outer Limit: 42,540,994 km
- M1: 140,323 km (0.049 R)
- M2: 227,389 km (0.107 R)
- M3: 300,393 km (0.098 R)
- M4: 432,188 km (0.052 R)
- M5: 525,537 km (0.111 R)
- M6: 597,344 km (0.113 R)
- M7: 731,085 km (0.085 R)
- M8: 870,061 km (0.108 R)
- M9: 1,201,420 km (0.058 R)
- M10: 1,287,140 km (0.04 R)
- M11: 1,423,424 km (0.039 R)
- M12: 1,579,006 km (0.106 R)
- M13: 1,673,551 km (0.037 R)
- M14: 1,915,002 km (0.11 R)
- M15: 1,992,793 km (0.052 R)
- M16: 2,079,710 km (0.077 R)
- M17: 2,151,816 km (0.115 R)
- M18: 2,224,670 km (0.051 R)
- M19: 2,323,255 km (0.114 R)
- M20: 2,533,440 km (0.105 R)
- M21: 2,785,064 km (0.084 R)
- M22: 3,008,712 km (0.117 R)
- M23: 3,081,567 km (0.105 R)
- M24: 3,294,295 km (0.03 R)
- M25: 3,369,542 km (0.112 R)
- M26: 3,483,237 km (0.099 R)
- M27: 3,763,733 km (0.089 R)
- M28: 3,891,789 km (0.12 R)
- M29: 4,031,513 km (0.082 R)
- M30: 4,142,365 km (0.087 R)
- M31: 4,470,882 km (0.065 R)
- M32: 4,733,426 km (0.04 R)
- M33: 4,871,954 km (0.046 R)
- M34: 5,109,515 km (0.092 R)
- M35: 5,362,036 km (0.069 R)
- M36: 5,596,157 km (0.066 R)
- M37: 5,674,995 km (0.1 R)
- M38: 6,225,366 km (0.117 R)
- M39: 6,365,689 km (0.082 R)
- M40: 6,613,722 km (0.095 R)
- M41: 6,816,876 km (0.115 R)
- M42: 6,961,537 km (0.086 R)
- M43: 7,034,241 km (0.066 R)
- M44: 7,414,070 km (0.115 R)
- M45: 7,650,136 km (0.11 R)
- M46: 7,762,783 km (0.11 R)
- M47: 7,863,462 km (0.077 R)
- M48: 7,939,309 km (0.116 R)
- M49: 8,219,206 km (0.089 R)
- M50: 8,412,038 km (0.073 R)
- M51: 8,867,563 km (0.066 R)
Planet 5 - Gas Giant
Semi-Major Axis: 4.06 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 918.4
Radius: 12.6
Gravity: 5.78 G
Time & Orbit
Eccentricity (e): 0.031
Orbit Range: 3.93 AU - 4.19 AU
Year: 5282 Days
Day: 12.3 Hours
Environment
Temp: -212 °C
Axial Tilt: 38.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 42,540,994 km
- M1: 172,636 km (0.102 R)
- M2: 372,200 km (0.112 R)
- M3: 452,683 km (0.116 R)
- M4: 649,404 km (0.089 R)
- M5: 779,854 km (0.093 R)
- M6: 877,092 km (0.061 R)
- M7: 1,293,124 km (0.092 R)
- M8: 1,497,475 km (0.065 R)
- M9: 1,621,791 km (0.109 R)
- M10: 2,804,212 km (0.06 R)
- M11: 3,185,687 km (0.101 R)
- M12: 3,371,188 km (0.114 R)
- M13: 3,512,558 km (0.109 R)
- M14: 3,825,966 km (0.096 R)
- M15: 3,973,768 km (0.116 R)
- M16: 5,250,586 km (0.075 R)
- M17: 5,693,396 km (0.099 R)
- M18: 6,062,005 km (0.114 R)
- M19: 6,263,812 km (0.087 R)
- M20: 6,733,550 km (0.07 R)
- M21: 7,184,288 km (0.108 R)
- M22: 7,551,850 km (0.105 R)
- M23: 7,706,983 km (0.087 R)
- M24: 8,051,806 km (0.029 R)
- M25: 8,497,907 km (0.111 R)
- M26: 9,381,282 km (0.104 R)
- M27: 9,715,933 km (0.09 R)
- M28: 10,225,164 km (0.048 R)
- M29: 10,328,087 km (0.052 R)
- M30: 11,199,196 km (0.035 R)
- M31: 11,625,699 km (0.052 R)
- M32: 11,805,067 km (0.071 R)
- M33: 12,899,974 km (0.092 R)
- M34: 13,011,275 km (0.077 R)
- M35: 14,602,847 km (0.066 R)
- M36: 15,500,284 km (0.059 R)
- M37: 15,816,684 km (0.067 R)
- M38: 16,335,339 km (0.066 R)
- M39: 16,415,674 km (0.084 R)
- M40: 16,496,008 km (0.115 R)
- M41: 16,576,641 km (0.036 R)
- M42: 16,697,666 km (0.032 R)
- M43: 17,430,396 km (0.104 R)
- M44: 17,676,933 km (0.085 R)
- M45: 18,549,089 km (0.108 R)
- M46: 18,758,675 km (0.107 R)
- M47: 18,842,899 km (0.115 R)
- M48: 19,435,157 km (0.089 R)
- M49: 21,204,750 km (0.088 R)
- M50: 21,424,061 km (0.118 R)
- M51: 21,688,251 km (0.095 R)
- M52: 21,776,513 km (0.106 R)
- M53: 22,442,673 km (0.056 R)
- M54: 22,531,982 km (0.081 R)
- M55: 22,755,781 km (0.098 R)
- M56: 23,115,414 km (0.108 R)
- M57: 23,250,800 km (0.106 R)
- M58: 23,431,664 km (0.119 R)
- M59: 24,022,875 km (0.107 R)
- M60: 24,618,873 km (0.113 R)
- M61: 26,814,371 km (0.08 R)
- M62: 28,344,757 km (0.117 R)
- M63: 28,538,038 km (0.078 R)
- M64: 28,828,706 km (0.082 R)
- M65: 28,925,945 km (0.056 R)
- M66: 29,756,064 km (0.111 R)
- M67: 30,149,356 km (0.093 R)
- M68: 31,040,661 km (0.112 R)
- M69: 32,041,171 km (0.056 R)
- M70: 32,697,158 km (0.115 R)
- M71: 33,103,166 km (0.075 R)
- M72: 33,510,671 km (0.034 R)
- M73: 34,022,445 km (0.11 R)
Planet 6 - Gas Giant
Semi-Major Axis: 5.01 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 253.2
Radius: 11.7
Gravity: 1.85 G
Time & Orbit
Eccentricity (e): 0.002
Orbit Range: 5 AU - 5.02 AU
Year: 7241 Days
Day: 10.6 Hours
Environment
Temp: -219 °C
Axial Tilt: 11.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (59)
Outer Limit: 42,540,994 km
- M1: 150,047 km (0.118 R)
- M2: 229,483 km (0.07 R)
- M3: 318,494 km (0.101 R)
- M4: 530,923 km (0.065 R)
- M5: 735,124 km (0.059 R)
- M6: 817,253 km (0.12 R)
- M7: 1,193,641 km (0.098 R)
- M8: 1,423,873 km (0.072 R)
- M9: 1,529,339 km (0.112 R)
- M10: 1,684,771 km (0.085 R)
- M11: 2,028,547 km (0.087 R)
- M12: 2,217,639 km (0.068 R)
- M13: 2,412,714 km (0.081 R)
- M14: 2,521,472 km (0.045 R)
- M15: 2,934,661 km (0.052 R)
- M16: 3,973,619 km (0.068 R)
- M17: 4,059,637 km (0.073 R)
- M18: 4,634,093 km (0.083 R)
- M19: 5,688,309 km (0.118 R)
- M20: 5,785,548 km (0.034 R)
- M21: 6,583,503 km (0.097 R)
- M22: 7,362,758 km (0.099 R)
- M23: 7,952,922 km (0.099 R)
- M24: 8,308,815 km (0.095 R)
- M25: 8,391,693 km (0.113 R)
- M26: 8,474,719 km (0.103 R)
- M27: 8,558,195 km (0.065 R)
- M28: 9,235,574 km (0.057 R)
- M29: 9,667,613 km (0.1 R)
- M30: 10,731,702 km (0.065 R)
- M31: 11,677,610 km (0.078 R)
- M32: 12,491,422 km (0.057 R)
- M33: 12,681,860 km (0.12 R)
- M34: 14,372,167 km (0.09 R)
- M35: 14,538,519 km (0.093 R)
- M36: 14,839,361 km (0.095 R)
- M37: 15,074,828 km (0.12 R)
- M38: 15,788,709 km (0.112 R)
- M39: 15,994,556 km (0.114 R)
- M40: 18,970,805 km (0.102 R)
- M41: 19,483,178 km (0.096 R)
- M42: 19,778,035 km (0.082 R)
- M43: 20,260,339 km (0.064 R)
- M44: 20,446,887 km (0.086 R)
- M45: 20,746,532 km (0.09 R)
- M46: 20,934,576 km (0.094 R)
- M47: 21,616,144 km (0.108 R)
- M48: 21,883,177 km (0.108 R)
- M49: 21,997,918 km (0.072 R)
- M50: 22,613,364 km (0.11 R)
- M51: 23,156,703 km (0.119 R)
- M52: 23,822,115 km (0.099 R)
- M53: 24,097,973 km (0.05 R)
- M54: 24,176,961 km (0.042 R)
- M55: 24,692,625 km (0.104 R)
- M56: 24,971,774 km (0.066 R)
- M57: 25,171,787 km (0.068 R)
- M58: 25,734,873 km (0.087 R)
- M59: 27,037,272 km (0.079 R)
Planet 7 - Ice Giant
Semi-Major Axis: 6.84 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 647.8
Radius: 7
Gravity: 13.22 G
Time & Orbit
Eccentricity (e): 0.094
Orbit Range: 6.2 AU - 7.48 AU
Year: 11550 Days
Day: 20.1 Hours
Environment
Temp: -231 °C
Axial Tilt: 15.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (85)
Outer Limit: 42,540,994 km
- M1: 100,081 km (0.113 R)
- M2: 303,833 km (0.097 R)
- M3: 440,267 km (0.03 R)
- M4: 485,295 km (0.056 R)
- M5: 630,854 km (0.085 R)
- M6: 983,756 km (0.101 R)
- M7: 1,191,846 km (0.118 R)
- M8: 1,345,932 km (0.049 R)
- M9: 1,553,574 km (0.104 R)
- M10: 2,025,106 km (0.076 R)
- M11: 2,737,791 km (0.113 R)
- M12: 2,883,200 km (0.088 R)
- M13: 3,151,279 km (0.106 R)
- M14: 3,427,437 km (0.101 R)
- M15: 3,489,819 km (0.059 R)
- M16: 3,743,388 km (0.108 R)
- M17: 3,840,028 km (0.097 R)
- M18: 4,168,245 km (0.046 R)
- M19: 4,301,986 km (0.117 R)
- M20: 4,573,805 km (0.09 R)
- M21: 4,711,884 km (0.11 R)
- M22: 5,568,930 km (0.118 R)
- M23: 5,827,884 km (0.118 R)
- M24: 6,204,572 km (0.105 R)
- M25: 7,021,376 km (0.064 R)
- M26: 7,301,124 km (0.064 R)
- M27: 8,753,869 km (0.077 R)
- M28: 9,711,595 km (0.105 R)
- M29: 10,112,816 km (0.055 R)
- M30: 10,247,903 km (0.117 R)
- M31: 10,474,095 km (0.12 R)
- M32: 10,656,305 km (0.107 R)
- M33: 10,931,715 km (0.107 R)
- M34: 12,343,171 km (0.099 R)
- M35: 12,391,192 km (0.08 R)
- M36: 14,211,648 km (0.119 R)
- M37: 18,368,375 km (0.092 R)
- M38: 20,094,584 km (0.074 R)
- M39: 20,548,464 km (0.042 R)
- M40: 21,988,493 km (0.073 R)
- M41: 22,046,687 km (0.112 R)
- M42: 22,105,030 km (0.053 R)
- M43: 22,986,012 km (0.045 R)
- M44: 23,045,253 km (0.083 R)
- M45: 23,401,146 km (0.106 R)
- M46: 24,419,459 km (0.095 R)
- M47: 24,661,209 km (0.1 R)
- M48: 24,964,444 km (0.106 R)
- M49: 25,391,097 km (0.117 R)
- M50: 25,635,989 km (0.108 R)
- M51: 26,996,731 km (0.092 R)
- M52: 28,571,398 km (0.108 R)
- M53: 30,046,284 km (0.044 R)
- M54: 31,545,703 km (0.119 R)
- M55: 32,139,008 km (0.1 R)
- M56: 34,413,494 km (0.101 R)
- M57: 34,616,798 km (0.08 R)
- M58: 34,684,566 km (0.103 R)
- M59: 35,160,436 km (0.053 R)
- M60: 35,912,764 km (0.076 R)
- M61: 36,050,095 km (0.104 R)
- M62: 36,325,355 km (0.039 R)
- M63: 36,739,591 km (0.106 R)
- M64: 39,469,453 km (0.116 R)
- M65: 40,108,685 km (0.074 R)
- M66: 40,679,700 km (0.098 R)
- M67: 41,397,321 km (0.057 R)
- M68: 43,063,542 km (0.089 R)
- M69: 43,209,550 km (0.083 R)
- M70: 44,603,952 km (0.075 R)
- M71: 44,677,853 km (0.092 R)
- M72: 44,751,605 km (0.054 R)
- M73: 44,825,506 km (0.069 R)
- M74: 44,973,458 km (0.101 R)
- M75: 45,418,063 km (0.084 R)
- M76: 45,492,413 km (0.093 R)
- M77: 47,587,831 km (0.03 R)
- M78: 47,738,625 km (0.106 R)
- M79: 48,875,270 km (0.041 R)
- M80: 49,790,959 km (0.118 R)
- M81: 51,097,995 km (0.053 R)
- M82: 51,252,530 km (0.116 R)
- M83: 51,329,722 km (0.066 R)
- M84: 51,407,064 km (0.06 R)
- M85: 51,639,390 km (0.086 R)
Planet 8 - Ice Giant
Semi-Major Axis: 9.88 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 119.1
Radius: 7.4
Gravity: 2.17 G
Time & Orbit
Eccentricity (e): 0.104
Orbit Range: 8.85 AU - 10.91 AU
Year: 20052 Days
Day: 20.9 Hours
Environment
Temp: -230 °C
Axial Tilt: 37.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (50)
Outer Limit: 42,540,994 km
- M1: 1,107,024 km (0.1 R)
- M2: 1,181,374 km (0.113 R)
- M3: 1,747,453 km (0.092 R)
- M4: 2,127,731 km (0.12 R)
- M5: 2,632,474 km (0.069 R)
- M6: 3,014,995 km (0.057 R)
- M7: 3,067,355 km (0.109 R)
- M8: 3,775,401 km (0.106 R)
- M9: 4,060,834 km (0.076 R)
- M10: 4,532,217 km (0.043 R)
- M11: 5,398,090 km (0.084 R)
- M12: 5,948,460 km (0.077 R)
- M13: 6,014,433 km (0.111 R)
- M14: 8,919,324 km (0.114 R)
- M15: 9,222,858 km (0.109 R)
- M16: 9,801,054 km (0.084 R)
- M17: 9,918,040 km (0.081 R)
- M18: 10,193,001 km (0.058 R)
- M19: 11,154,616 km (0.101 R)
- M20: 12,144,954 km (0.106 R)
- M21: 12,948,743 km (0.106 R)
- M22: 13,077,247 km (0.105 R)
- M23: 15,734,704 km (0.096 R)
- M24: 16,285,673 km (0.046 R)
- M25: 16,331,899 km (0.059 R)
- M26: 18,215,486 km (0.088 R)
- M27: 19,919,256 km (0.101 R)
- M28: 20,865,313 km (0.103 R)
- M29: 21,116,637 km (0.08 R)
- M30: 21,369,009 km (0.093 R)
- M31: 22,081,095 km (0.098 R)
- M32: 22,234,732 km (0.067 R)
- M33: 22,852,571 km (0.098 R)
- M34: 25,594,849 km (0.088 R)
- M35: 25,702,261 km (0.114 R)
- M36: 25,809,971 km (0.1 R)
- M37: 27,718,541 km (0.114 R)
- M38: 28,050,349 km (0.075 R)
- M39: 28,829,454 km (0.077 R)
- M40: 30,352,211 km (0.076 R)
- M41: 31,727,464 km (0.1 R)
- M42: 32,364,751 km (0.09 R)
- M43: 35,014,878 km (0.104 R)
- M44: 35,493,142 km (0.08 R)
- M45: 37,367,304 km (0.103 R)
- M46: 39,087,530 km (0.063 R)
- M47: 40,206,971 km (0.119 R)
- M48: 41,084,961 km (0.041 R)
- M49: 41,210,922 km (0.118 R)
- M50: 42,413,689 km (0.09 R)
Kuiper Belt
Range: 30 - 46 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 487 - 12,408 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.