🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.41 AU

Composition

Type: Inner System (Rocky)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Terrestrial

Semi-Major Axis: 0.81 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.03

Radius: 1.01

Gravity: 1.01 G

Time & Orbit

Eccentricity (e): 0.059

Orbit Range: 0.76 AU - 0.86 AU

Year: 272 Days

Day: 22.1 Hours

Environment

Temp: 118 °C

Axial Tilt: 38.5 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 1.22 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.5

Radius: 1.44

Gravity: 1.21 G

Time & Orbit

Eccentricity (e): 0.137

Orbit Range: 1.05 AU - 1.39 AU

Year: 502 Days

Day: 24 Hours

Environment

Temp: 7 °C

Axial Tilt: 12.8 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Asteroid Belt

Center: 3.06 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 3 - Gas Giant

Semi-Major Axis: 4.9 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 861.1

Radius: 13.9

Gravity: 4.46 G

Time & Orbit

Eccentricity (e): 0.14

Orbit Range: 4.21 AU - 5.59 AU

Year: 4043 Days

Day: 10.4 Hours

Environment

Temp: -146 °C

Axial Tilt: 43.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 56,550,547 km

• M1: 545,434 km (0.108 R)
• M2: 750,383 km (0.093 R)
• M3: 919,279 km (0.114 R)
• M4: 1,061,846 km (0.11 R)
• M5: 1,198,578 km (0.084 R)
• M6: 1,400,535 km (0.101 R)
• M7: 1,905,129 km (0.088 R)
• M8: 2,040,066 km (0.085 R)
• M9: 2,266,408 km (0.12 R)
• M10: 2,649,827 km (0.101 R)
• M11: 2,995,249 km (0.114 R)
• M12: 3,173,420 km (0.115 R)
• M13: 3,624,008 km (0.092 R)
• M14: 3,878,624 km (0.088 R)
• M15: 4,383,068 km (0.112 R)
• M16: 4,746,441 km (0.109 R)
• M17: 5,143,324 km (0.046 R)
• M18: 5,285,891 km (0.117 R)
• M19: 5,550,979 km (0.067 R)
• M20: 5,746,503 km (0.053 R)
• M21: 6,094,318 km (0.115 R)
• M22: 6,245,562 km (0.111 R)
• M23: 6,706,622 km (0.063 R)
• M24: 6,836,623 km (0.072 R)
• M25: 6,967,670 km (0.071 R)
• M26: 7,178,753 km (0.114 R)
• M27: 7,311,895 km (0.102 R)
• M28: 7,472,713 km (0.101 R)
• M29: 7,634,727 km (0.103 R)
• M30: 7,770,712 km (0.119 R)
• M31: 7,962,347 km (0.075 R)
• M32: 8,518,552 km (0.101 R)
• M33: 8,773,018 km (0.078 R)
• M34: 8,915,584 km (0.054 R)
• M35: 9,493,182 km (0.119 R)
• M36: 9,816,014 km (0.074 R)
• M37: 10,082,896 km (0.071 R)
• M38: 10,352,173 km (0.118 R)
• M39: 10,867,388 km (0.09 R)
• M40: 11,051,244 km (0.118 R)
• M41: 11,143,695 km (0.06 R)
• M42: 11,267,113 km (0.104 R)
• M43: 11,453,213 km (0.056 R)
• M44: 11,828,554 km (0.051 R)
• M45: 12,080,926 km (0.108 R)
• M46: 12,495,013 km (0.096 R)
• M47: 12,655,531 km (0.072 R)
• M48: 12,978,662 km (0.079 R)
• M49: 14,030,934 km (0.084 R)
• M50: 14,131,015 km (0.104 R)
• M51: 14,264,755 km (0.083 R)
• M52: 14,668,670 km (0.117 R)
• M53: 14,838,014 km (0.089 R)
• M54: 15,008,107 km (0.113 R)
• M55: 15,213,056 km (0.072 R)
• M56: 15,418,903 km (0.091 R)
• M57: 15,556,683 km (0.094 R)
• M58: 16,251,714 km (0.049 R)
• M59: 17,063,432 km (0.057 R)
• M60: 17,600,040 km (0.097 R)
• M61: 18,214,887 km (0.096 R)
• M62: 18,616,408 km (0.09 R)
• M63: 18,763,163 km (0.093 R)
• M64: 18,873,567 km (0.069 R)
• M65: 19,279,874 km (0.088 R)
• M66: 19,726,574 km (0.069 R)
• M67: 19,876,171 km (0.042 R)
• M68: 20,668,143 km (0.107 R)
• M69: 21,163,461 km (0.096 R)
• M70: 21,355,096 km (0.086 R)
• M71: 21,508,733 km (0.12 R)
• M72: 22,438,484 km (0.072 R)
• M73: 23,381,399 km (0.049 R)
• M74: 23,778,133 km (0.093 R)
• M75: 24,417,514 km (0.043 R)
• M76: 24,699,057 km (0.04 R)
• M77: 25,224,744 km (0.113 R)
• M78: 26,823,945 km (0.096 R)
• M79: 27,531,394 km (0.106 R)
• M80: 27,782,419 km (0.06 R)

Planet 4 - Gas Giant

Semi-Major Axis: 6.57 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 813.1

Radius: 14.9

Gravity: 3.66 G

Time & Orbit

Eccentricity (e): 0.239

Orbit Range: 5 AU - 8.14 AU

Year: 6278 Days

Day: 11.5 Hours

Environment

Temp: -150 °C

Axial Tilt: 46.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (73)

Outer Limit: 56,550,547 km

• M1: 188,643 km (0.06 R)
• M2: 407,205 km (0.057 R)
• M3: 538,702 km (0.058 R)
• M4: 813,064 km (0.119 R)
• M5: 1,252,284 km (0.053 R)
• M6: 1,554,471 km (0.049 R)
• M7: 2,250,700 km (0.051 R)
• M8: 2,532,692 km (0.093 R)
• M9: 2,895,766 km (0.072 R)
• M10: 3,275,894 km (0.114 R)
• M11: 4,110,501 km (0.109 R)
• M12: 4,565,727 km (0.064 R)
• M13: 4,757,960 km (0.073 R)
• M14: 5,122,081 km (0.055 R)
• M15: 6,421,638 km (0.105 R)
• M16: 6,668,624 km (0.105 R)
• M17: 7,076,727 km (0.102 R)
• M18: 7,299,927 km (0.11 R)
• M19: 7,525,371 km (0.117 R)
• M20: 8,249,275 km (0.057 R)
• M21: 8,858,139 km (0.036 R)
• M22: 9,064,285 km (0.098 R)
• M23: 9,905,174 km (0.092 R)
• M24: 10,661,391 km (0.103 R)
• M25: 11,399,059 km (0.113 R)
• M26: 12,305,921 km (0.067 R)
• M27: 13,079,491 km (0.118 R)
• M28: 13,868,770 km (0.055 R)
• M29: 14,108,575 km (0.107 R)
• M30: 14,632,916 km (0.082 R)
• M31: 15,825,660 km (0.113 R)
• M32: 15,992,611 km (0.049 R)
• M33: 16,118,273 km (0.116 R)
• M34: 16,328,458 km (0.104 R)
• M35: 16,454,868 km (0.098 R)
• M36: 17,737,820 km (0.08 R)
• M37: 18,085,485 km (0.072 R)
• M38: 18,523,059 km (0.112 R)
• M39: 19,230,657 km (0.057 R)
• M40: 19,677,356 km (0.096 R)
• M41: 20,535,449 km (0.046 R)
• M42: 20,763,436 km (0.087 R)
• M43: 21,175,728 km (0.086 R)
• M44: 21,452,035 km (0.1 R)
• M45: 22,194,938 km (0.12 R)
• M46: 22,757,726 km (0.091 R)
• M47: 23,040,914 km (0.096 R)
• M48: 23,135,460 km (0.115 R)
• M49: 23,993,105 km (0.069 R)
• M50: 24,281,230 km (0.102 R)
• M51: 24,667,342 km (0.049 R)
• M52: 25,201,407 km (0.09 R)
• M53: 25,347,863 km (0.087 R)
• M54: 25,690,442 km (0.107 R)
• M55: 26,380,089 km (0.109 R)
• M56: 26,677,639 km (0.079 R)
• M57: 26,826,788 km (0.115 R)
• M58: 27,727,517 km (0.041 R)
• M59: 28,282,973 km (0.084 R)
• M60: 28,384,251 km (0.101 R)
• M61: 29,558,894 km (0.034 R)
• M62: 29,867,813 km (0.1 R)
• M63: 30,074,408 km (0.091 R)
• M64: 30,281,601 km (0.073 R)
• M65: 31,955,302 km (0.111 R)
• M66: 32,272,449 km (0.086 R)
• M67: 32,750,115 km (0.078 R)
• M68: 33,176,769 km (0.029 R)
• M69: 33,605,217 km (0.027 R)
• M70: 34,684,416 km (0.082 R)
• M71: 34,955,936 km (0.111 R)
• M72: 35,119,297 km (0.115 R)
• M73: 35,665,329 km (0.1 R)

Planet 5 - Gas Giant

Semi-Major Axis: 6.67 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 290.5

Radius: 9.5

Gravity: 3.22 G

Time & Orbit

Eccentricity (e): 0.113

Orbit Range: 5.92 AU - 7.42 AU

Year: 6422 Days

Day: 13.3 Hours

Environment

Temp: -154 °C

Axial Tilt: 4.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (61)

Outer Limit: 56,550,547 km

• M1: 157,676 km (0.114 R)
• M2: 217,366 km (0.111 R)
• M3: 278,102 km (0.101 R)
• M4: 416,480 km (0.085 R)
• M5: 601,832 km (0.07 R)
• M6: 744,848 km (0.112 R)
• M7: 911,949 km (0.111 R)
• M8: 1,091,765 km (0.09 R)
• M9: 1,441,824 km (0.109 R)
• M10: 1,606,831 km (0.062 R)
• M11: 2,071,781 km (0.109 R)
• M12: 2,241,724 km (0.091 R)
• M13: 2,576,973 km (0.111 R)
• M14: 2,834,431 km (0.099 R)
• M15: 3,061,820 km (0.086 R)
• M16: 3,615,332 km (0.109 R)
• M17: 3,717,507 km (0.104 R)
• M18: 5,292,623 km (0.093 R)
• M19: 5,906,573 km (0.104 R)
• M20: 7,201,193 km (0.064 R)
• M21: 7,616,776 km (0.093 R)
• M22: 8,444,052 km (0.104 R)
• M23: 8,662,166 km (0.119 R)
• M24: 9,809,282 km (0.066 R)
• M25: 9,923,724 km (0.107 R)
• M26: 10,125,083 km (0.065 R)
• M27: 10,269,744 km (0.077 R)
• M28: 10,444,325 km (0.107 R)
• M29: 11,241,831 km (0.119 R)
• M30: 11,967,082 km (0.119 R)
• M31: 12,212,273 km (0.102 R)
• M32: 12,273,757 km (0.049 R)
• M33: 12,676,325 km (0.092 R)
• M34: 12,895,037 km (0.085 R)
• M35: 13,910,059 km (0.089 R)
• M36: 14,819,315 km (0.084 R)
• M37: 15,314,184 km (0.078 R)
• M38: 15,580,469 km (0.117 R)
• M39: 16,456,065 km (0.09 R)
• M40: 16,592,349 km (0.064 R)
• M41: 16,797,148 km (0.062 R)
• M42: 17,382,375 km (0.115 R)
• M43: 17,625,322 km (0.102 R)
• M44: 17,694,885 km (0.058 R)
• M45: 17,799,454 km (0.108 R)
• M46: 18,114,507 km (0.118 R)
• M47: 18,325,590 km (0.118 R)
• M48: 18,821,207 km (0.11 R)
• M49: 19,142,095 km (0.078 R)
• M50: 20,006,770 km (0.053 R)
• M51: 20,370,742 km (0.118 R)
• M52: 21,068,467 km (0.067 R)
• M53: 21,327,420 km (0.08 R)
• M54: 21,736,571 km (0.096 R)
• M55: 22,185,963 km (0.084 R)
• M56: 23,552,390 km (0.095 R)
• M57: 24,245,626 km (0.042 R)
• M58: 24,517,146 km (0.118 R)
• M59: 24,789,564 km (0.083 R)
• M60: 25,141,418 km (0.076 R)
• M61: 26,565,141 km (0.119 R)

Planet 6 - Gas Giant

Semi-Major Axis: 8.28 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 980.5

Radius: 14.1

Gravity: 4.93 G

Time & Orbit

Eccentricity (e): 0.204

Orbit Range: 6.59 AU - 9.97 AU

Year: 8882 Days

Day: 10.6 Hours

Environment

Temp: -166 °C

Axial Tilt: 39.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 56,550,547 km

• M1: 305,628 km (0.093 R)
• M2: 543,788 km (0.079 R)
• M3: 650,152 km (0.104 R)
• M4: 852,259 km (0.101 R)
• M5: 1,321,996 km (0.078 R)
• M6: 2,506,662 km (0.076 R)
• M7: 2,642,497 km (0.063 R)
• M8: 2,893,223 km (0.075 R)
• M9: 3,093,834 km (0.12 R)
• M10: 3,269,461 km (0.118 R)
• M11: 4,229,730 km (0.111 R)
• M12: 4,327,118 km (0.092 R)
• M13: 5,661,681 km (0.088 R)
• M14: 6,392,616 km (0.082 R)
• M15: 6,542,513 km (0.046 R)
• M16: 7,037,533 km (0.085 R)
• M17: 7,309,053 km (0.081 R)
• M18: 7,703,094 km (0.088 R)
• M19: 8,471,129 km (0.075 R)
• M20: 8,885,066 km (0.093 R)
• M21: 9,305,885 km (0.115 R)
• M22: 9,475,978 km (0.112 R)
• M23: 10,430,263 km (0.086 R)
• M24: 11,780,533 km (0.042 R)
• M25: 12,382,665 km (0.084 R)
• M26: 13,280,850 km (0.115 R)
• M27: 13,665,317 km (0.074 R)
• M28: 14,053,523 km (0.12 R)
• M29: 14,642,640 km (0.111 R)
• M30: 14,741,673 km (0.112 R)
• M31: 15,239,834 km (0.082 R)
• M32: 15,693,116 km (0.11 R)
• M33: 16,099,573 km (0.111 R)
• M34: 16,201,749 km (0.105 R)
• M35: 17,602,433 km (0.066 R)
• M36: 18,024,898 km (0.045 R)
• M37: 18,290,733 km (0.066 R)
• M38: 18,772,289 km (0.058 R)
• M39: 18,987,710 km (0.1 R)
• M40: 19,420,945 km (0.109 R)
• M41: 19,802,869 km (0.066 R)
• M42: 20,187,185 km (0.095 R)
• M43: 20,796,049 km (0.082 R)
• M44: 21,411,046 km (0.092 R)
• M45: 21,523,394 km (0.103 R)
• M46: 22,031,877 km (0.12 R)
• M47: 22,945,770 km (0.043 R)
• M48: 23,118,406 km (0.098 R)
• M49: 23,697,350 km (0.08 R)
• M50: 25,046,872 km (0.103 R)
• M51: 25,701,064 km (0.085 R)
• M52: 25,880,432 km (0.104 R)
• M53: 26,120,387 km (0.092 R)
• M54: 26,723,266 km (0.057 R)
• M55: 26,844,291 km (0.101 R)
• M56: 27,391,669 km (0.106 R)
• M57: 27,697,447 km (0.109 R)
• M58: 28,745,231 km (0.068 R)
• M59: 29,367,558 km (0.117 R)
• M60: 29,492,622 km (0.066 R)
• M61: 29,617,835 km (0.093 R)
• M62: 30,562,546 km (0.117 R)
• M63: 31,134,010 km (0.072 R)
• M64: 31,325,345 km (0.049 R)
• M65: 32,675,317 km (0.094 R)
• M66: 32,804,868 km (0.087 R)
• M67: 33,651,293 km (0.082 R)
• M68: 34,044,287 km (0.068 R)
• M69: 34,175,634 km (0.116 R)
• M70: 34,307,280 km (0.071 R)
• M71: 35,166,271 km (0.032 R)
• M72: 36,636,219 km (0.116 R)
• M73: 37,649,895 km (0.089 R)
• M74: 37,921,714 km (0.083 R)
• M75: 38,330,864 km (0.088 R)
• M76: 38,809,876 km (0.086 R)
• M77: 39,222,168 km (0.071 R)
• M78: 42,855,152 km (0.095 R)
• M79: 43,352,416 km (0.114 R)
• M80: 43,851,474 km (0.04 R)
• M81: 45,722,196 km (0.103 R)
• M82: 47,692,250 km (0.107 R)
• M83: 48,281,366 km (0.075 R)

Planet 7 - Gas Giant

Semi-Major Axis: 10.82 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 63.4

Radius: 10.9

Gravity: 0.53 G

Time & Orbit

Eccentricity (e): 0.241

Orbit Range: 8.21 AU - 13.43 AU

Year: 13268 Days

Day: 10 Hours

Environment

Temp: -179 °C

Axial Tilt: 6.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (53)

Outer Limit: 56,550,547 km

• M1: 165,605 km (0.053 R)
• M2: 713,881 km (0.086 R)
• M3: 922,420 km (0.047 R)
• M4: 1,009,038 km (0.112 R)
• M5: 1,204,712 km (0.067 R)
• M6: 1,456,186 km (0.117 R)
• M7: 1,663,678 km (0.12 R)
• M8: 2,091,378 km (0.048 R)
• M9: 2,174,405 km (0.119 R)
• M10: 2,447,571 km (0.079 R)
• M11: 3,008,264 km (0.089 R)
• M12: 3,891,340 km (0.089 R)
• M13: 4,077,290 km (0.1 R)
• M14: 4,718,018 km (0.057 R)
• M15: 5,505,202 km (0.107 R)
• M16: 5,902,234 km (0.113 R)
• M17: 6,430,016 km (0.041 R)
• M18: 6,625,690 km (0.07 R)
• M19: 7,325,957 km (0.104 R)
• M20: 8,473,822 km (0.074 R)
• M21: 8,877,886 km (0.078 R)
• M22: 8,986,793 km (0.104 R)
• M23: 9,205,804 km (0.075 R)
• M24: 9,426,461 km (0.06 R)
• M25: 9,929,708 km (0.073 R)
• M26: 10,014,381 km (0.103 R)
• M27: 10,327,040 km (0.115 R)
• M28: 11,020,576 km (0.038 R)
• M29: 11,225,675 km (0.108 R)
• M30: 11,848,451 km (0.12 R)
• M31: 12,270,017 km (0.072 R)
• M32: 12,727,188 km (0.093 R)
• M33: 13,096,845 km (0.091 R)
• M34: 13,251,978 km (0.112 R)
• M35: 13,345,327 km (0.07 R)
• M36: 13,720,967 km (0.067 R)
• M37: 13,846,929 km (0.106 R)
• M38: 14,227,206 km (0.088 R)
• M39: 15,881,460 km (0.079 R)
• M40: 16,113,336 km (0.086 R)
• M41: 16,613,741 km (0.066 R)
• M42: 17,835,806 km (0.116 R)
• M43: 18,076,659 km (0.081 R)
• M44: 19,545,111 km (0.094 R)
• M45: 20,617,429 km (0.069 R)
• M46: 21,488,837 km (0.073 R)
• M47: 21,671,944 km (0.109 R)
• M48: 22,298,311 km (0.117 R)
• M49: 23,267,705 km (0.096 R)
• M50: 23,682,091 km (0.1 R)
• M51: 24,212,864 km (0.061 R)
• M52: 24,939,611 km (0.117 R)
• M53: 25,324,975 km (0.082 R)

Planet 8 - Ice Giant

Semi-Major Axis: 17.11 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 161.6

Radius: 4.4

Gravity: 8.35 G

Time & Orbit

Eccentricity (e): 0.097

Orbit Range: 15.45 AU - 18.77 AU

Year: 26383 Days

Day: 21.8 Hours

Environment

Temp: -196 °C

Axial Tilt: 17.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (56)

Outer Limit: 56,550,547 km

• M1: 948,151 km (0.084 R)
• M2: 1,101,040 km (0.042 R)
• M3: 1,309,131 km (0.104 R)
• M4: 1,682,976 km (0.074 R)
• M5: 2,004,462 km (0.119 R)
• M6: 2,432,611 km (0.119 R)
• M7: 3,077,827 km (0.047 R)
• M8: 3,174,168 km (0.09 R)
• M9: 3,304,019 km (0.111 R)
• M10: 4,770,676 km (0.109 R)
• M11: 6,738,786 km (0.051 R)
• M12: 7,244,127 km (0.111 R)
• M13: 7,805,419 km (0.104 R)
• M14: 8,650,497 km (0.059 R)
• M15: 11,552,995 km (0.062 R)
• M16: 11,602,811 km (0.1 R)
• M17: 11,903,652 km (0.117 R)
• M18: 12,461,802 km (0.113 R)
• M19: 12,873,046 km (0.088 R)
• M20: 13,236,569 km (0.093 R)
• M21: 13,288,779 km (0.107 R)
• M22: 13,656,042 km (0.12 R)
• M23: 14,940,788 km (0.1 R)
• M24: 15,818,479 km (0.084 R)
• M25: 17,279,900 km (0.077 R)
• M26: 17,394,044 km (0.093 R)
• M27: 17,623,228 km (0.085 R)
• M28: 17,911,054 km (0.119 R)
• M29: 17,968,799 km (0.092 R)
• M30: 18,374,957 km (0.051 R)
• M31: 19,137,008 km (0.116 R)
• M32: 20,752,366 km (0.094 R)
• M33: 21,668,504 km (0.105 R)
• M34: 22,286,642 km (0.068 R)
• M35: 23,098,809 km (0.118 R)
• M36: 24,303,221 km (0.071 R)
• M37: 24,495,305 km (0.113 R)
• M38: 29,116,234 km (0.07 R)
• M39: 34,714,186 km (0.117 R)
• M40: 36,749,764 km (0.062 R)
• M41: 36,896,669 km (0.118 R)
• M42: 36,970,271 km (0.086 R)
• M43: 37,782,139 km (0.106 R)
• M44: 38,004,441 km (0.088 R)
• M45: 39,048,335 km (0.1 R)
• M46: 39,799,616 km (0.101 R)
• M47: 46,137,330 km (0.073 R)
• M48: 46,772,223 km (0.101 R)
• M49: 47,170,602 km (0.085 R)
• M50: 47,330,223 km (0.095 R)
• M51: 47,649,914 km (0.087 R)
• M52: 49,827,311 km (0.042 R)
• M53: 49,908,542 km (0.086 R)
• M54: 51,050,722 km (0.086 R)
• M55: 54,948,046 km (0.112 R)
• M56: 56,127,326 km (0.117 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: 468 - 14,626 AU

Composition

Type: Cometary Reservoir

System's final boundary, containing trillions of icy planetesimals.

Gravitational Limit