🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.4 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.79 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 553.2

Radius: 11

Gravity: 4.57 G

Time & Orbit

Eccentricity (e): 0.151

Orbit Range: 0.67 AU - 0.91 AU

Year: 468 Days

Day: 12.7 Hours

Environment

Temp: -173 °C

Axial Tilt: 1.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (42)

Outer Limit: 47,975,985 km

• M1: 145,260 km (0.067 R)
• M2: 220,058 km (0.081 R)
• M3: 294,857 km (0.113 R)
• M4: 366,365 km (0.116 R)
• M5: 459,116 km (0.095 R)
• M6: 569,220 km (0.05 R)
• M7: 658,530 km (0.032 R)
• M8: 741,108 km (0.032 R)
• M9: 853,007 km (0.07 R)
• M10: 944,411 km (0.045 R)
• M11: 1,071,869 km (0.055 R)
• M12: 1,249,441 km (0.071 R)
• M13: 1,349,672 km (0.108 R)
• M14: 1,421,479 km (0.084 R)
• M15: 1,553,125 km (0.114 R)
• M16: 1,650,513 km (0.032 R)
• M17: 1,868,777 km (0.101 R)
• M18: 1,938,040 km (0.099 R)
• M19: 2,061,010 km (0.096 R)
• M20: 2,433,658 km (0.079 R)
• M21: 2,814,534 km (0.117 R)
• M22: 2,887,538 km (0.066 R)
• M23: 2,968,171 km (0.081 R)
• M24: 3,069,748 km (0.114 R)
• M25: 3,158,909 km (0.093 R)
• M26: 3,228,023 km (0.107 R)
• M27: 3,396,171 km (0.108 R)
• M28: 3,567,161 km (0.076 R)
• M29: 3,661,109 km (0.12 R)
• M30: 3,821,777 km (0.065 R)
• M31: 3,917,819 km (0.094 R)
• M32: 4,014,758 km (0.112 R)
• M33: 4,120,075 km (0.084 R)
• M34: 4,341,181 km (0.118 R)
• M35: 4,441,561 km (0.105 R)
• M36: 4,691,988 km (0.118 R)
• M37: 4,786,982 km (0.045 R)
• M38: 5,011,529 km (0.098 R)
• M39: 5,313,567 km (0.087 R)
• M40: 5,420,978 km (0.112 R)
• M41: 5,495,927 km (0.104 R)
• M42: 5,680,381 km (0.075 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.17 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 227.6

Radius: 9.9

Gravity: 2.32 G

Time & Orbit

Eccentricity (e): 0.157

Orbit Range: 0.99 AU - 1.35 AU

Year: 844 Days

Day: 12 Hours

Environment

Temp: -187 °C

Axial Tilt: 22.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (50)

Outer Limit: 47,975,985 km

• M1: 124,166 km (0.091 R)
• M2: 197,469 km (0.09 R)
• M3: 259,552 km (0.097 R)
• M4: 354,846 km (0.047 R)
• M5: 433,834 km (0.091 R)
• M6: 516,561 km (0.114 R)
• M7: 645,964 km (0.111 R)
• M8: 721,660 km (0.093 R)
• M9: 818,600 km (0.097 R)
• M10: 910,901 km (0.094 R)
• M11: 1,016,667 km (0.099 R)
• M12: 1,106,426 km (0.095 R)
• M13: 1,241,214 km (0.093 R)
• M14: 1,453,792 km (0.044 R)
• M15: 1,584,690 km (0.071 R)
• M16: 1,648,868 km (0.114 R)
• M17: 1,761,665 km (0.06 R)
• M18: 1,852,620 km (0.111 R)
• M19: 1,989,053 km (0.117 R)
• M20: 2,052,034 km (0.116 R)
• M21: 2,128,778 km (0.057 R)
• M22: 2,344,498 km (0.069 R)
• M23: 2,431,564 km (0.09 R)
• M24: 2,519,677 km (0.111 R)
• M25: 2,595,074 km (0.104 R)
• M26: 2,671,369 km (0.099 R)
• M27: 2,769,505 km (0.047 R)
• M28: 2,861,658 km (0.078 R)
• M29: 2,933,315 km (0.074 R)
• M30: 3,049,104 km (0.06 R)
• M31: 3,151,728 km (0.1 R)
• M32: 3,270,509 km (0.104 R)
• M33: 3,337,977 km (0.108 R)
• M34: 3,436,263 km (0.113 R)
• M35: 3,589,451 km (0.08 R)
• M36: 4,094,643 km (0.104 R)
• M37: 4,273,562 km (0.079 R)
• M38: 4,639,180 km (0.117 R)
• M39: 4,723,702 km (0.112 R)
• M40: 4,851,459 km (0.07 R)
• M41: 5,171,598 km (0.111 R)
• M42: 5,285,592 km (0.113 R)
• M43: 5,418,435 km (0.111 R)
• M44: 5,480,668 km (0.117 R)
• M45: 5,597,055 km (0.113 R)
• M46: 5,660,035 km (0.096 R)
• M47: 5,759,518 km (0.109 R)
• M48: 5,841,348 km (0.118 R)
• M49: 6,024,605 km (0.11 R)
• M50: 6,256,482 km (0.072 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.3 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 166.1

Radius: 12.7

Gravity: 1.03 G

Time & Orbit

Eccentricity (e): 0.018

Orbit Range: 1.28 AU - 1.32 AU

Year: 988 Days

Day: 9.6 Hours

Environment

Temp: -191 °C

Axial Tilt: 37.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (43)

Outer Limit: 47,975,985 km

• M1: 161,566 km (0.12 R)
• M2: 261,198 km (0.082 R)
• M3: 354,996 km (0.098 R)
• M4: 446,699 km (0.041 R)
• M5: 545,583 km (0.099 R)
• M6: 787,932 km (0.119 R)
• M7: 872,455 km (0.119 R)
• M8: 955,631 km (0.082 R)
• M9: 1,081,293 km (0.076 R)
• M10: 1,181,973 km (0.087 R)
• M11: 1,270,236 km (0.027 R)
• M12: 1,398,890 km (0.079 R)
• M13: 1,509,592 km (0.068 R)
• M14: 1,594,713 km (0.112 R)
• M15: 1,693,298 km (0.053 R)
• M16: 1,793,978 km (0.091 R)
• M17: 1,878,500 km (0.104 R)
• M18: 2,007,903 km (0.042 R)
• M19: 2,108,582 km (0.11 R)
• M20: 2,334,924 km (0.118 R)
• M21: 2,467,916 km (0.118 R)
• M22: 2,555,730 km (0.078 R)
• M23: 2,686,030 km (0.102 R)
• M24: 2,860,910 km (0.106 R)
• M25: 3,047,009 km (0.11 R)
• M26: 3,134,225 km (0.086 R)
• M27: 3,237,148 km (0.113 R)
• M28: 3,371,188 km (0.103 R)
• M29: 3,469,025 km (0.101 R)
• M30: 3,729,774 km (0.088 R)
• M31: 3,823,422 km (0.065 R)
• M32: 3,941,455 km (0.077 R)
• M33: 4,116,933 km (0.105 R)
• M34: 4,246,186 km (0.107 R)
• M35: 4,684,209 km (0.049 R)
• M36: 4,955,729 km (0.109 R)
• M37: 5,162,772 km (0.119 R)
• M38: 5,549,931 km (0.099 R)
• M39: 5,693,097 km (0.028 R)
• M40: 5,801,256 km (0.065 R)
• M41: 5,992,292 km (0.104 R)
• M42: 6,129,922 km (0.12 R)
• M43: 6,352,524 km (0.098 R)

Planet 4 - Gas Giant

Semi-Major Axis: 2.57 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 947.6

Radius: 10.7

Gravity: 8.28 G

Time & Orbit

Eccentricity (e): 0.049

Orbit Range: 2.44 AU - 2.7 AU

Year: 2747 Days

Day: 12.6 Hours

Environment

Temp: -203 °C

Axial Tilt: 42.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (67)

Outer Limit: 47,975,985 km

• M1: 135,087 km (0.075 R)
• M2: 227,090 km (0.099 R)
• M3: 361,728 km (0.062 R)
• M4: 631,303 km (0.096 R)
• M5: 800,498 km (0.063 R)
• M6: 1,124,677 km (0.08 R)
• M7: 1,321,099 km (0.052 R)
• M8: 1,609,673 km (0.085 R)
• M9: 2,338,813 km (0.082 R)
• M10: 2,854,178 km (0.05 R)
• M11: 3,005,421 km (0.112 R)
• M12: 3,159,507 km (0.049 R)
• M13: 3,333,789 km (0.066 R)
• M14: 3,673,675 km (0.112 R)
• M15: 3,746,679 km (0.051 R)
• M16: 3,987,232 km (0.091 R)
• M17: 4,425,554 km (0.114 R)
• M18: 4,779,203 km (0.107 R)
• M19: 5,183,117 km (0.09 R)
• M20: 5,410,057 km (0.094 R)
• M21: 5,535,121 km (0.105 R)
• M22: 5,809,633 km (0.075 R)
• M23: 5,959,231 km (0.114 R)
• M24: 6,197,092 km (0.06 R)
• M25: 6,284,307 km (0.078 R)
• M26: 6,482,225 km (0.074 R)
• M27: 6,570,787 km (0.084 R)
• M28: 6,816,427 km (0.085 R)
• M29: 7,248,017 km (0.071 R)
• M30: 7,340,020 km (0.083 R)
• M31: 7,409,283 km (0.055 R)
• M32: 7,618,421 km (0.071 R)
• M33: 7,876,627 km (0.098 R)
• M34: 8,018,745 km (0.098 R)
• M35: 8,233,568 km (0.078 R)
• M36: 8,498,505 km (0.088 R)
• M37: 8,766,435 km (0.105 R)
• M38: 9,012,374 km (0.1 R)
• M39: 9,310,523 km (0.104 R)
• M40: 9,713,240 km (0.084 R)
• M41: 9,942,125 km (0.047 R)
• M42: 10,379,699 km (0.079 R)
• M43: 10,928,723 km (0.102 R)
• M44: 11,300,025 km (0.095 R)
• M45: 11,702,593 km (0.103 R)
• M46: 11,891,984 km (0.112 R)
• M47: 12,328,809 km (0.087 R)
• M48: 13,133,945 km (0.07 R)
• M49: 13,613,855 km (0.091 R)
• M50: 13,756,123 km (0.056 R)
• M51: 14,445,918 km (0.108 R)
• M52: 14,532,835 km (0.093 R)
• M53: 14,941,237 km (0.104 R)
• M54: 15,176,255 km (0.115 R)
• M55: 15,412,470 km (0.11 R)
• M56: 15,590,492 km (0.082 R)
• M57: 16,068,606 km (0.094 R)
• M58: 16,369,747 km (0.117 R)
• M59: 17,192,535 km (0.102 R)
• M60: 17,438,773 km (0.102 R)
• M61: 17,655,391 km (0.071 R)
• M62: 17,779,408 km (0.047 R)
• M63: 18,814,625 km (0.064 R)
• M64: 20,550,259 km (0.105 R)
• M65: 21,041,389 km (0.107 R)
• M66: 22,001,957 km (0.078 R)
• M67: 22,068,678 km (0.096 R)

Planet 5 - Gas Giant

Semi-Major Axis: 4.31 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 503.9

Radius: 12.2

Gravity: 3.39 G

Time & Orbit

Eccentricity (e): 0.036

Orbit Range: 4.15 AU - 4.47 AU

Year: 5967 Days

Day: 13.9 Hours

Environment

Temp: -219 °C

Axial Tilt: 26.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 47,975,985 km

• M1: 156,779 km (0.065 R)
• M2: 310,266 km (0.08 R)
• M3: 492,925 km (0.105 R)
• M4: 657,483 km (0.103 R)
• M5: 791,074 km (0.09 R)
• M6: 881,431 km (0.119 R)
• M7: 1,145,770 km (0.076 R)
• M8: 1,234,781 km (0.112 R)
• M9: 1,357,301 km (0.104 R)
• M10: 1,452,147 km (0.104 R)
• M11: 1,682,228 km (0.098 R)
• M12: 2,086,442 km (0.097 R)
• M13: 2,178,444 km (0.031 R)
• M14: 2,366,638 km (0.086 R)
• M15: 2,521,173 km (0.102 R)
• M16: 2,719,091 km (0.063 R)
• M17: 3,067,504 km (0.042 R)
• M18: 3,650,338 km (0.075 R)
• M19: 4,721,608 km (0.039 R)
• M20: 5,444,315 km (0.061 R)
• M21: 5,936,642 km (0.079 R)
• M22: 6,042,108 km (0.047 R)
• M23: 6,228,358 km (0.104 R)
• M24: 6,308,692 km (0.102 R)
• M25: 6,715,748 km (0.09 R)
• M26: 6,991,905 km (0.103 R)
• M27: 7,131,330 km (0.058 R)
• M28: 7,555,440 km (0.09 R)
• M29: 8,104,465 km (0.104 R)
• M30: 8,251,071 km (0.092 R)
• M31: 8,726,343 km (0.073 R)
• M32: 9,210,442 km (0.107 R)
• M33: 9,796,716 km (0.083 R)
• M34: 10,973,153 km (0.032 R)
• M35: 11,364,202 km (0.095 R)
• M36: 11,462,787 km (0.051 R)
• M37: 11,561,522 km (0.116 R)
• M38: 11,926,241 km (0.085 R)
• M39: 12,598,983 km (0.068 R)
• M40: 12,871,550 km (0.113 R)
• M41: 14,618,854 km (0.076 R)
• M42: 14,761,869 km (0.096 R)
• M43: 15,338,569 km (0.111 R)
• M44: 15,885,947 km (0.102 R)
• M45: 16,328,458 km (0.106 R)
• M46: 16,588,459 km (0.083 R)
• M47: 16,775,008 km (0.104 R)
• M48: 16,887,206 km (0.1 R)
• M49: 17,452,387 km (0.105 R)
• M50: 18,872,968 km (0.091 R)
• M51: 19,145,835 km (0.054 R)
• M52: 19,224,074 km (0.093 R)
• M53: 19,537,931 km (0.086 R)
• M54: 19,656,113 km (0.058 R)
• M55: 19,893,226 km (0.084 R)
• M56: 20,690,283 km (0.092 R)
• M57: 20,810,709 km (0.114 R)
• M58: 21,092,701 km (0.097 R)
• M59: 21,294,958 km (0.111 R)
• M60: 21,497,812 km (0.094 R)
• M61: 22,151,106 km (0.117 R)
• M62: 22,274,375 km (0.051 R)
• M63: 22,562,949 km (0.094 R)
• M64: 24,319,527 km (0.109 R)
• M65: 25,000,347 km (0.082 R)
• M66: 25,085,917 km (0.118 R)
• M67: 25,989,937 km (0.107 R)
• M68: 26,948,411 km (0.064 R)
• M69: 27,124,039 km (0.104 R)
• M70: 28,318,727 km (0.091 R)
• M71: 28,541,778 km (0.06 R)
• M72: 28,765,576 km (0.087 R)
• M73: 29,620,977 km (0.104 R)
• M74: 29,756,812 km (0.101 R)
• M75: 29,892,946 km (0.039 R)
• M76: 30,120,035 km (0.116 R)
• M77: 30,484,755 km (0.036 R)

Planet 6 - Ice Giant

Semi-Major Axis: 6.33 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 81.5

Radius: 5.1

Gravity: 3.13 G

Time & Orbit

Eccentricity (e): 0.154

Orbit Range: 5.36 AU - 7.3 AU

Year: 10620 Days

Day: 16.9 Hours

Environment

Temp: -221 °C

Axial Tilt: 33.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (53)

Outer Limit: 47,975,985 km

• M1: 87,964 km (0.109 R)
• M2: 178,171 km (0.076 R)
• M3: 251,923 km (0.101 R)
• M4: 396,584 km (0.09 R)
• M5: 576,251 km (0.086 R)
• M6: 638,185 km (0.112 R)
• M7: 702,362 km (0.101 R)
• M8: 1,158,187 km (0.041 R)
• M9: 1,528,292 km (0.083 R)
• M10: 1,855,313 km (0.081 R)
• M11: 2,171,114 km (0.119 R)
• M12: 2,606,444 km (0.06 R)
• M13: 3,728,877 km (0.097 R)
• M14: 3,925,598 km (0.063 R)
• M15: 4,227,037 km (0.109 R)
• M16: 4,745,693 km (0.061 R)
• M17: 4,830,665 km (0.069 R)
• M18: 4,916,085 km (0.063 R)
• M19: 4,980,412 km (0.092 R)
• M20: 6,186,171 km (0.11 R)
• M21: 6,442,283 km (0.109 R)
• M22: 6,989,213 km (0.112 R)
• M23: 7,085,853 km (0.085 R)
• M24: 8,051,208 km (0.072 R)
• M25: 8,510,473 km (0.109 R)
• M26: 8,665,457 km (0.07 R)
• M27: 9,321,294 km (0.088 R)
• M28: 9,641,732 km (0.106 R)
• M29: 9,695,438 km (0.1 R)
• M30: 10,486,063 km (0.056 R)
• M31: 11,954,964 km (0.07 R)
• M32: 12,099,625 km (0.112 R)
• M33: 12,742,747 km (0.111 R)
• M34: 12,801,688 km (0.108 R)
• M35: 13,247,340 km (0.095 R)
• M36: 14,001,164 km (0.077 R)
• M37: 15,392,723 km (0.047 R)
• M38: 15,993,359 km (0.102 R)
• M39: 17,217,668 km (0.106 R)
• M40: 17,775,069 km (0.065 R)
• M41: 17,807,981 km (0.026 R)
• M42: 17,973,137 km (0.093 R)
• M43: 18,238,524 km (0.074 R)
• M44: 18,371,666 km (0.11 R)
• M45: 18,538,467 km (0.071 R)
• M46: 20,028,761 km (0.117 R)
• M47: 20,097,427 km (0.078 R)
• M48: 20,510,915 km (0.062 R)
• M49: 20,927,246 km (0.116 R)
• M50: 23,014,585 km (0.106 R)
• M51: 23,411,020 km (0.102 R)
• M52: 24,064,463 km (0.102 R)
• M53: 24,210,620 km (0.098 R)

Planet 7 - Ice Giant

Semi-Major Axis: 6.4 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 589.2

Radius: 7.8

Gravity: 9.68 G

Time & Orbit

Eccentricity (e): 0.038

Orbit Range: 6.16 AU - 6.64 AU

Year: 10797 Days

Day: 19.5 Hours

Environment

Temp: -224 °C

Axial Tilt: 4.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (90)

Outer Limit: 47,975,985 km

• M1: 253,269 km (0.11 R)
• M2: 321,336 km (0.062 R)
• M3: 424,110 km (0.059 R)
• M4: 523,892 km (0.065 R)
• M5: 584,928 km (0.071 R)
• M6: 664,813 km (0.079 R)
• M7: 1,080,396 km (0.12 R)
• M8: 2,187,570 km (0.056 R)
• M9: 2,367,087 km (0.054 R)
• M10: 2,419,297 km (0.092 R)
• M11: 2,850,737 km (0.102 R)
• M12: 2,934,362 km (0.106 R)
• M13: 3,018,735 km (0.09 R)
• M14: 3,075,433 km (0.088 R)
• M15: 3,276,941 km (0.108 R)
• M16: 4,062,330 km (0.12 R)
• M17: 4,347,314 km (0.108 R)
• M18: 4,573,506 km (0.111 R)
• M19: 5,206,903 km (0.102 R)
• M20: 5,412,750 km (0.074 R)
• M21: 5,481,864 km (0.096 R)
• M22: 5,621,140 km (0.104 R)
• M23: 5,867,677 km (0.111 R)
• M24: 6,739,683 km (0.12 R)
• M25: 7,885,753 km (0.089 R)
• M26: 8,241,347 km (0.074 R)
• M27: 8,400,968 km (0.101 R)
• M28: 8,521,394 km (0.026 R)
• M29: 9,505,449 km (0.11 R)
• M30: 9,968,454 km (0.066 R)
• M31: 10,309,836 km (0.092 R)
• M32: 10,568,342 km (0.103 R)
• M33: 11,091,934 km (0.081 R)
• M34: 11,445,583 km (0.115 R)
• M35: 11,713,364 km (0.099 R)
• M36: 12,804,830 km (0.081 R)
• M37: 13,036,258 km (0.115 R)
• M38: 13,550,426 km (0.118 R)
• M39: 14,071,176 km (0.119 R)
• M40: 14,937,347 km (0.102 R)
• M41: 15,622,954 km (0.117 R)
• M42: 15,870,240 km (0.069 R)
• M43: 16,218,803 km (0.102 R)
• M44: 16,821,981 km (0.045 R)
• M45: 16,973,973 km (0.075 R)
• M46: 17,075,550 km (0.082 R)
• M47: 17,228,289 km (0.113 R)
• M48: 18,050,479 km (0.095 R)
• M49: 18,102,390 km (0.069 R)
• M50: 18,206,061 km (0.103 R)
• M51: 18,258,121 km (0.11 R)
• M52: 18,832,876 km (0.079 R)
• M53: 18,885,534 km (0.074 R)
• M54: 19,360,657 km (0.082 R)
• M55: 20,918,569 km (0.082 R)
• M56: 22,127,021 km (0.085 R)
• M57: 23,188,717 km (0.067 R)
• M58: 23,471,008 km (0.073 R)
• M59: 26,354,657 km (0.088 R)
• M60: 26,472,390 km (0.078 R)
• M61: 27,182,083 km (0.111 R)
• M62: 28,740,893 km (0.084 R)
• M63: 30,451,993 km (0.044 R)
• M64: 30,699,129 km (0.11 R)
• M65: 30,760,913 km (0.063 R)
• M66: 30,822,846 km (0.03 R)
• M67: 31,071,029 km (0.06 R)
• M68: 31,944,681 km (0.081 R)
• M69: 33,779,947 km (0.076 R)
• M70: 33,907,704 km (0.093 R)
• M71: 34,163,815 km (0.119 R)
• M72: 34,292,170 km (0.058 R)
• M73: 34,807,086 km (0.091 R)
• M74: 35,259,620 km (0.041 R)
• M75: 37,023,528 km (0.11 R)
• M76: 38,015,961 km (0.075 R)
• M77: 38,481,958 km (0.107 R)
• M78: 39,554,425 km (0.116 R)
• M79: 40,433,013 km (0.09 R)
• M80: 40,772,600 km (0.059 R)
• M81: 42,346,968 km (0.09 R)
• M82: 42,830,170 km (0.103 R)
• M83: 43,245,603 km (0.098 R)
• M84: 44,080,808 km (0.094 R)
• M85: 45,061,871 km (0.112 R)
• M86: 45,908,445 km (0.093 R)
• M87: 46,049,965 km (0.083 R)
• M88: 47,045,389 km (0.07 R)
• M89: 47,617,301 km (0.047 R)
• M90: 47,832,423 km (0.042 R)

Kuiper Belt

Range: 30 - 52 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 227 - 17,168 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit