Star System Generated (Seed: 1766763529)
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: 1.03 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 428.2
Radius: 12.7
Gravity: 2.65 G
Time & Orbit
Eccentricity (e): 0.093
Orbit Range: 0.93 AU - 1.13 AU
Year: 735 Days
Day: 12.9 Hours
Environment
Temp: -184 °C
Axial Tilt: 10.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (42)
Outer Limit: 26,697,153 km
- M1: 159,771 km (0.063 R)
- M2: 251,175 km (0.115 R)
- M3: 373,695 km (0.051 R)
- M4: 491,429 km (0.037 R)
- M5: 578,794 km (0.099 R)
- M6: 668,403 km (0.119 R)
- M7: 791,672 km (0.076 R)
- M8: 883,525 km (0.108 R)
- M9: 984,803 km (0.099 R)
- M10: 1,133,503 km (0.109 R)
- M11: 1,284,597 km (0.053 R)
- M12: 1,695,841 km (0.117 R)
- M13: 1,831,228 km (0.113 R)
- M14: 1,970,354 km (0.071 R)
- M15: 2,316,224 km (0.091 R)
- M16: 2,481,829 km (0.086 R)
- M17: 2,592,082 km (0.083 R)
- M18: 2,711,611 km (0.092 R)
- M19: 2,848,194 km (0.114 R)
- M20: 3,081,118 km (0.107 R)
- M21: 3,216,055 km (0.089 R)
- M22: 3,409,784 km (0.076 R)
- M23: 3,491,764 km (0.119 R)
- M24: 3,766,725 km (0.09 R)
- M25: 3,894,182 km (0.098 R)
- M26: 4,083,723 km (0.089 R)
- M27: 4,179,615 km (0.076 R)
- M28: 4,294,057 km (0.062 R)
- M29: 4,499,006 km (0.105 R)
- M30: 4,580,088 km (0.043 R)
- M31: 4,661,619 km (0.074 R)
- M32: 4,743,599 km (0.064 R)
- M33: 4,890,803 km (0.075 R)
- M34: 5,303,245 km (0.059 R)
- M35: 5,600,795 km (0.112 R)
- M36: 5,756,376 km (0.032 R)
- M37: 5,982,718 km (0.103 R)
- M38: 6,202,029 km (0.037 R)
- M39: 6,669,223 km (0.104 R)
- M40: 6,772,296 km (0.114 R)
- M41: 6,907,083 km (0.107 R)
- M42: 7,158,408 km (0.111 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.14 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 882.4
Radius: 12.7
Gravity: 5.47 G
Time & Orbit
Eccentricity (e): 0.007
Orbit Range: 1.13 AU - 1.15 AU
Year: 856 Days
Day: 6.6 Hours
Environment
Temp: -173 °C
Axial Tilt: 38 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (58)
Outer Limit: 26,697,153 km
- M1: 179,966 km (0.038 R)
- M2: 259,552 km (0.104 R)
- M3: 346,469 km (0.086 R)
- M4: 436,078 km (0.11 R)
- M5: 856,747 km (0.093 R)
- M6: 1,022,950 km (0.092 R)
- M7: 1,236,127 km (0.081 R)
- M8: 1,374,206 km (0.104 R)
- M9: 1,456,784 km (0.118 R)
- M10: 1,564,345 km (0.067 R)
- M11: 1,650,813 km (0.109 R)
- M12: 1,747,154 km (0.089 R)
- M13: 1,845,290 km (0.091 R)
- M14: 1,937,143 km (0.104 R)
- M15: 2,030,641 km (0.074 R)
- M16: 2,311,138 km (0.088 R)
- M17: 2,465,523 km (0.084 R)
- M18: 2,613,924 km (0.1 R)
- M19: 2,784,615 km (0.102 R)
- M20: 3,008,114 km (0.037 R)
- M21: 3,127,194 km (0.084 R)
- M22: 3,257,942 km (0.103 R)
- M23: 3,380,313 km (0.077 R)
- M24: 3,587,656 km (0.103 R)
- M25: 3,692,973 km (0.104 R)
- M26: 3,939,211 km (0.033 R)
- M27: 4,058,889 km (0.087 R)
- M28: 4,235,265 km (0.117 R)
- M29: 4,391,595 km (0.118 R)
- M30: 4,641,274 km (0.099 R)
- M31: 4,744,796 km (0.117 R)
- M32: 4,977,570 km (0.083 R)
- M33: 5,261,956 km (0.084 R)
- M34: 5,406,168 km (0.101 R)
- M35: 5,563,994 km (0.081 R)
- M36: 5,896,550 km (0.088 R)
- M37: 6,273,686 km (0.079 R)
- M38: 6,529,498 km (0.075 R)
- M39: 6,619,855 km (0.102 R)
- M40: 6,762,721 km (0.12 R)
- M41: 7,051,595 km (0.114 R)
- M42: 7,170,974 km (0.08 R)
- M43: 7,290,951 km (0.094 R)
- M44: 7,492,609 km (0.07 R)
- M45: 7,600,769 km (0.06 R)
- M46: 7,805,269 km (0.055 R)
- M47: 7,887,548 km (0.082 R)
- M48: 8,149,942 km (0.072 R)
- M49: 8,233,418 km (0.11 R)
- M50: 8,401,267 km (0.066 R)
- M51: 8,669,496 km (0.092 R)
- M52: 9,069,670 km (0.081 R)
- M53: 9,170,798 km (0.12 R)
- M54: 9,257,565 km (0.105 R)
- M55: 9,388,463 km (0.079 R)
- M56: 9,769,938 km (0.108 R)
- M57: 9,992,390 km (0.109 R)
- M58: 10,096,809 km (0.112 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.37 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 829
Radius: 9.9
Gravity: 8.46 G
Time & Orbit
Eccentricity (e): 0.103
Orbit Range: 1.23 AU - 1.51 AU
Year: 1127 Days
Day: 9 Hours
Environment
Temp: -195 °C
Axial Tilt: 10.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (67)
Outer Limit: 26,697,153 km
- M1: 184,454 km (0.065 R)
- M2: 410,347 km (0.041 R)
- M3: 541,843 km (0.036 R)
- M4: 657,034 km (0.074 R)
- M5: 747,690 km (0.1 R)
- M6: 835,953 km (0.104 R)
- M7: 928,105 km (0.103 R)
- M8: 1,009,038 km (0.112 R)
- M9: 1,092,364 km (0.112 R)
- M10: 1,202,019 km (0.045 R)
- M11: 1,424,321 km (0.104 R)
- M12: 1,527,394 km (0.063 R)
- M13: 1,678,039 km (0.117 R)
- M14: 1,750,594 km (0.047 R)
- M15: 1,824,196 km (0.092 R)
- M16: 2,080,757 km (0.108 R)
- M17: 2,218,536 km (0.075 R)
- M18: 2,298,571 km (0.033 R)
- M19: 2,492,749 km (0.083 R)
- M20: 2,702,934 km (0.111 R)
- M21: 2,930,024 km (0.089 R)
- M22: 3,140,957 km (0.118 R)
- M23: 3,253,903 km (0.046 R)
- M24: 3,345,457 km (0.098 R)
- M25: 3,414,571 km (0.112 R)
- M26: 3,554,296 km (0.085 R)
- M27: 3,636,575 km (0.091 R)
- M28: 3,743,537 km (0.089 R)
- M29: 3,923,952 km (0.07 R)
- M30: 4,193,976 km (0.09 R)
- M31: 4,281,192 km (0.108 R)
- M32: 4,356,440 km (0.03 R)
- M33: 4,482,700 km (0.094 R)
- M34: 4,817,051 km (0.078 R)
- M35: 4,921,471 km (0.09 R)
- M36: 5,119,538 km (0.117 R)
- M37: 5,226,202 km (0.083 R)
- M38: 5,482,612 km (0.075 R)
- M39: 5,993,639 km (0.101 R)
- M40: 6,191,108 km (0.108 R)
- M41: 6,693,906 km (0.086 R)
- M42: 7,002,078 km (0.074 R)
- M43: 7,076,129 km (0.088 R)
- M44: 7,150,479 km (0.091 R)
- M45: 7,299,778 km (0.101 R)
- M46: 7,420,054 km (0.118 R)
- M47: 7,754,256 km (0.084 R)
- M48: 7,861,667 km (0.102 R)
- M49: 8,093,394 km (0.091 R)
- M50: 8,218,009 km (0.106 R)
- M51: 8,311,807 km (0.085 R)
- M52: 8,390,197 km (0.1 R)
- M53: 8,754,318 km (0.096 R)
- M54: 8,866,217 km (0.084 R)
- M55: 9,010,729 km (0.064 R)
- M56: 9,091,362 km (0.115 R)
- M57: 9,269,533 km (0.071 R)
- M58: 9,383,526 km (0.061 R)
- M59: 9,662,377 km (0.025 R)
- M60: 9,744,955 km (0.057 R)
- M61: 10,094,266 km (0.05 R)
- M62: 10,161,286 km (0.094 R)
- M63: 10,329,434 km (0.096 R)
- M64: 10,566,397 km (0.088 R)
- M65: 11,045,708 km (0.111 R)
- M66: 11,235,847 km (0.094 R)
- M67: 11,514,548 km (0.089 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.92 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 30.2
Radius: 12.6
Gravity: 0.19 G
Time & Orbit
Eccentricity (e): 0.066
Orbit Range: 1.79 AU - 2.05 AU
Year: 1870 Days
Day: 12.7 Hours
Environment
Temp: -210 °C
Axial Tilt: 48.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (31)
Outer Limit: 26,697,153 km
- M1: 199,713 km (0.056 R)
- M2: 350,358 km (0.106 R)
- M3: 447,597 km (0.094 R)
- M4: 527,183 km (0.083 R)
- M5: 685,607 km (0.103 R)
- M6: 865,872 km (0.11 R)
- M7: 1,014,423 km (0.106 R)
- M8: 1,107,922 km (0.09 R)
- M9: 1,200,074 km (0.09 R)
- M10: 1,668,615 km (0.059 R)
- M11: 1,775,577 km (0.091 R)
- M12: 1,946,119 km (0.056 R)
- M13: 2,042,011 km (0.095 R)
- M14: 2,180,239 km (0.119 R)
- M15: 2,286,005 km (0.083 R)
- M16: 2,490,505 km (0.056 R)
- M17: 2,570,391 km (0.087 R)
- M18: 2,682,439 km (0.088 R)
- M19: 2,815,432 km (0.104 R)
- M20: 2,898,758 km (0.107 R)
- M21: 3,081,267 km (0.106 R)
- M22: 3,328,253 km (0.109 R)
- M23: 3,416,666 km (0.096 R)
- M24: 3,792,306 km (0.026 R)
- M25: 4,108,406 km (0.044 R)
- M26: 4,218,062 km (0.073 R)
- M27: 4,343,724 km (0.095 R)
- M28: 4,575,900 km (0.102 R)
- M29: 4,766,188 km (0.072 R)
- M30: 5,029,331 km (0.088 R)
- M31: 5,489,195 km (0.091 R)
Asteroid Belt
Center: 2.26 AU
Composition
Type: Outer System (Icy)
A dense region of planetesimals and debris.
Boundary
Planet 5 - Gas Giant
Semi-Major Axis: 2.6 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 629.8
Radius: 8
Gravity: 9.84 G
Time & Orbit
Eccentricity (e): 0.165
Orbit Range: 2.17 AU - 3.03 AU
Year: 2947 Days
Day: 10.5 Hours
Environment
Temp: -202 °C
Axial Tilt: 33.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (79)
Outer Limit: 26,697,153 km
- M1: 101,278 km (0.082 R)
- M2: 270,024 km (0.077 R)
- M3: 529,876 km (0.09 R)
- M4: 644,916 km (0.107 R)
- M5: 848,818 km (0.091 R)
- M6: 911,051 km (0.084 R)
- M7: 1,245,402 km (0.091 R)
- M8: 1,352,963 km (0.094 R)
- M9: 1,426,416 km (0.1 R)
- M10: 1,747,154 km (0.118 R)
- M11: 1,800,710 km (0.105 R)
- M12: 1,909,168 km (0.117 R)
- M13: 2,204,624 km (0.119 R)
- M14: 2,277,179 km (0.086 R)
- M15: 2,469,412 km (0.051 R)
- M16: 2,651,772 km (0.061 R)
- M17: 2,713,406 km (0.096 R)
- M18: 3,094,133 km (0.12 R)
- M19: 3,159,208 km (0.105 R)
- M20: 3,441,050 km (0.084 R)
- M21: 3,644,803 km (0.086 R)
- M22: 4,135,932 km (0.075 R)
- M23: 4,425,853 km (0.108 R)
- M24: 4,517,856 km (0.084 R)
- M25: 4,666,406 km (0.029 R)
- M26: 4,741,205 km (0.045 R)
- M27: 4,873,151 km (0.077 R)
- M28: 5,218,273 km (0.087 R)
- M29: 5,810,830 km (0.036 R)
- M30: 6,238,231 km (0.115 R)
- M31: 6,675,805 km (0.038 R)
- M32: 7,405,394 km (0.109 R)
- M33: 7,735,257 km (0.087 R)
- M34: 8,070,057 km (0.072 R)
- M35: 8,455,122 km (0.095 R)
- M36: 8,661,418 km (0.081 R)
- M37: 8,939,071 km (0.096 R)
- M38: 9,717,728 km (0.072 R)
- M39: 9,789,535 km (0.046 R)
- M40: 9,957,982 km (0.103 R)
- M41: 10,297,569 km (0.099 R)
- M42: 10,468,859 km (0.041 R)
- M43: 10,542,461 km (0.115 R)
- M44: 10,715,097 km (0.075 R)
- M45: 11,063,211 km (0.056 R)
- M46: 11,188,425 km (0.118 R)
- M47: 11,238,540 km (0.043 R)
- M48: 12,362,170 km (0.118 R)
- M49: 12,674,829 km (0.102 R)
- M50: 12,779,697 km (0.095 R)
- M51: 12,884,715 km (0.105 R)
- M52: 12,963,703 km (0.11 R)
- M53: 13,254,820 km (0.071 R)
- M54: 13,361,184 km (0.11 R)
- M55: 13,521,254 km (0.095 R)
- M56: 13,574,810 km (0.113 R)
- M57: 13,708,850 km (0.099 R)
- M58: 13,843,338 km (0.082 R)
- M59: 13,951,348 km (0.091 R)
- M60: 14,113,811 km (0.089 R)
- M61: 14,358,553 km (0.119 R)
- M62: 14,440,533 km (0.086 R)
- M63: 14,632,317 km (0.053 R)
- M64: 14,769,798 km (0.116 R)
- M65: 15,631,781 km (0.038 R)
- M66: 15,687,880 km (0.11 R)
- M67: 15,856,926 km (0.119 R)
- M68: 16,767,977 km (0.114 R)
- M69: 17,229,935 km (0.096 R)
- M70: 17,287,979 km (0.044 R)
- M71: 17,871,859 km (0.099 R)
- M72: 18,048,385 km (0.099 R)
- M73: 18,581,252 km (0.12 R)
- M74: 18,939,240 km (0.093 R)
- M75: 18,999,229 km (0.118 R)
- M76: 19,119,206 km (0.079 R)
- M77: 19,359,909 km (0.064 R)
- M78: 20,088,152 km (0.08 R)
- M79: 20,271,708 km (0.106 R)
Planet 6 - Gas Giant
Semi-Major Axis: 2.77 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 945.1
Radius: 9.6
Gravity: 10.25 G
Time & Orbit
Eccentricity (e): 0.204
Orbit Range: 2.2 AU - 3.34 AU
Year: 3241 Days
Day: 12.2 Hours
Environment
Temp: -215 °C
Axial Tilt: 6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (84)
Outer Limit: 26,697,153 km
- M1: 120,127 km (0.087 R)
- M2: 179,966 km (0.086 R)
- M3: 249,529 km (0.037 R)
- M4: 382,821 km (0.116 R)
- M5: 534,663 km (0.089 R)
- M6: 707,748 km (0.118 R)
- M7: 935,585 km (0.117 R)
- M8: 996,322 km (0.095 R)
- M9: 1,213,538 km (0.088 R)
- M10: 1,321,099 km (0.119 R)
- M11: 1,531,583 km (0.103 R)
- M12: 1,829,432 km (0.115 R)
- M13: 2,001,021 km (0.045 R)
- M14: 2,145,533 km (0.082 R)
- M15: 2,445,028 km (0.032 R)
- M16: 2,992,107 km (0.093 R)
- M17: 3,232,660 km (0.115 R)
- M18: 3,752,513 km (0.053 R)
- M19: 4,215,967 km (0.059 R)
- M20: 4,277,751 km (0.062 R)
- M21: 4,676,280 km (0.048 R)
- M22: 4,890,953 km (0.073 R)
- M23: 5,263,152 km (0.046 R)
- M24: 5,441,623 km (0.068 R)
- M25: 6,292,535 km (0.025 R)
- M26: 6,410,718 km (0.112 R)
- M27: 6,505,712 km (0.091 R)
- M28: 6,601,305 km (0.096 R)
- M29: 7,012,699 km (0.095 R)
- M30: 7,258,638 km (0.03 R)
- M31: 7,457,304 km (0.049 R)
- M32: 7,784,176 km (0.108 R)
- M33: 7,936,616 km (0.068 R)
- M34: 8,115,684 km (0.113 R)
- M35: 8,270,369 km (0.028 R)
- M36: 8,399,920 km (0.11 R)
- M37: 8,608,609 km (0.101 R)
- M38: 8,872,051 km (0.101 R)
- M39: 9,111,408 km (0.054 R)
- M40: 9,191,592 km (0.095 R)
- M41: 9,272,076 km (0.086 R)
- M42: 9,514,873 km (0.083 R)
- M43: 9,650,708 km (0.037 R)
- M44: 9,759,915 km (0.115 R)
- M45: 10,479,331 km (0.109 R)
- M46: 11,129,932 km (0.056 R)
- M47: 11,590,245 km (0.057 R)
- M48: 11,735,355 km (0.08 R)
- M49: 11,851,891 km (0.095 R)
- M50: 12,470,179 km (0.106 R)
- M51: 13,280,401 km (0.092 R)
- M52: 13,341,138 km (0.047 R)
- M53: 13,401,875 km (0.058 R)
- M54: 13,584,833 km (0.059 R)
- M55: 13,737,872 km (0.111 R)
- M56: 14,200,578 km (0.109 R)
- M57: 14,418,243 km (0.068 R)
- M58: 14,480,625 km (0.08 R)
- M59: 14,543,007 km (0.099 R)
- M60: 14,636,955 km (0.077 R)
- M61: 14,982,975 km (0.101 R)
- M62: 15,491,159 km (0.103 R)
- M63: 15,619,065 km (0.092 R)
- M64: 15,779,434 km (0.062 R)
- M65: 16,101,817 km (0.101 R)
- M66: 16,199,056 km (0.112 R)
- M67: 17,082,282 km (0.06 R)
- M68: 17,713,136 km (0.048 R)
- M69: 18,115,554 km (0.093 R)
- M70: 18,182,873 km (0.102 R)
- M71: 18,385,429 km (0.066 R)
- M72: 19,168,873 km (0.084 R)
- M73: 19,340,761 km (0.109 R)
- M74: 19,824,411 km (0.093 R)
- M75: 20,662,757 km (0.03 R)
- M76: 21,405,959 km (0.081 R)
- M77: 21,655,638 km (0.113 R)
- M78: 22,591,373 km (0.1 R)
- M79: 23,137,255 km (0.096 R)
- M80: 23,466,820 km (0.062 R)
- M81: 23,687,476 km (0.113 R)
- M82: 24,167,835 km (0.11 R)
- M83: 24,242,036 km (0.091 R)
- M84: 24,987,931 km (0.045 R)
Planet 7 - Gas Giant
Semi-Major Axis: 4.46 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 270
Radius: 14.7
Gravity: 1.25 G
Time & Orbit
Eccentricity (e): 0.128
Orbit Range: 3.89 AU - 5.03 AU
Year: 6621 Days
Day: 9.2 Hours
Environment
Temp: -216 °C
Axial Tilt: 27.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (51)
Outer Limit: 26,697,153 km
- M1: 394,938 km (0.036 R)
- M2: 543,639 km (0.096 R)
- M3: 642,672 km (0.058 R)
- M4: 749,336 km (0.043 R)
- M5: 1,411,306 km (0.079 R)
- M6: 1,769,593 km (0.076 R)
- M7: 1,895,704 km (0.096 R)
- M8: 2,378,756 km (0.108 R)
- M9: 2,697,998 km (0.089 R)
- M10: 2,918,804 km (0.066 R)
- M11: 3,517,046 km (0.088 R)
- M12: 3,617,127 km (0.088 R)
- M13: 3,718,255 km (0.115 R)
- M14: 4,452,781 km (0.089 R)
- M15: 6,101,798 km (0.109 R)
- M16: 6,198,588 km (0.118 R)
- M17: 6,890,478 km (0.062 R)
- M18: 8,000,644 km (0.103 R)
- M19: 8,186,743 km (0.075 R)
- M20: 8,454,972 km (0.033 R)
- M21: 9,305,137 km (0.073 R)
- M22: 9,697,981 km (0.026 R)
- M23: 9,868,074 km (0.041 R)
- M24: 10,153,806 km (0.062 R)
- M25: 10,879,954 km (0.101 R)
- M26: 11,294,041 km (0.047 R)
- M27: 11,894,527 km (0.106 R)
- M28: 12,505,634 km (0.112 R)
- M29: 12,783,886 km (0.114 R)
- M30: 13,126,764 km (0.051 R)
- M31: 13,252,277 km (0.1 R)
- M32: 13,758,217 km (0.09 R)
- M33: 15,017,681 km (0.084 R)
- M34: 16,078,779 km (0.078 R)
- M35: 16,213,118 km (0.107 R)
- M36: 16,856,239 km (0.089 R)
- M37: 16,992,673 km (0.046 R)
- M38: 17,129,555 km (0.114 R)
- M39: 17,369,958 km (0.076 R)
- M40: 17,958,327 km (0.101 R)
- M41: 18,553,427 km (0.062 R)
- M42: 19,119,356 km (0.114 R)
- M43: 19,404,489 km (0.093 R)
- M44: 20,087,254 km (0.083 R)
- M45: 20,559,086 km (0.089 R)
- M46: 21,218,214 km (0.082 R)
- M47: 22,070,772 km (0.118 R)
- M48: 23,427,475 km (0.116 R)
- M49: 24,850,001 km (0.113 R)
- M50: 25,513,019 km (0.08 R)
- M51: 25,709,142 km (0.072 R)
Kuiper Belt
Range: 30 - 48 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 469 - 14,609 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.