🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.3 AU

Composition

Type: Inner System (Rocky)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Terrestrial

Semi-Major Axis: 0.6 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.11

Radius: 1.04

Gravity: 1.03 G

Time & Orbit

Eccentricity (e): 0.112

Orbit Range: 0.53 AU - 0.67 AU

Year: 300 Days

Day: 27.5 Hours

Environment

Temp: -118 °C

Axial Tilt: 11.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 43,109,690 km

• M1: 48,021 km (0.047 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.62 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.78

Radius: 0.91

Gravity: 0.94 G

Time & Orbit

Eccentricity (e): 0.171

Orbit Range: 0.51 AU - 0.73 AU

Year: 315 Days

Day: 21.3 Hours

Environment

Temp: -136 °C

Axial Tilt: 17.8 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Gas Giant

Semi-Major Axis: 1.19 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 814.6

Radius: 13.1

Gravity: 4.75 G

Time & Orbit

Eccentricity (e): 0.061

Orbit Range: 1.12 AU - 1.26 AU

Year: 838 Days

Day: 12.8 Hours

Environment

Temp: -171 °C

Axial Tilt: 0.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (50)

Outer Limit: 43,109,690 km

• M1: 177,124 km (0.084 R)
• M2: 273,016 km (0.081 R)
• M3: 375,191 km (0.098 R)
• M4: 531,072 km (0.115 R)
• M5: 669,301 km (0.113 R)
• M6: 774,917 km (0.073 R)
• M7: 923,916 km (0.095 R)
• M8: 1,024,745 km (0.081 R)
• M9: 1,190,350 km (0.035 R)
• M10: 1,394,402 km (0.091 R)
• M11: 1,482,365 km (0.053 R)
• M12: 1,617,901 km (0.062 R)
• M13: 1,781,711 km (0.088 R)
• M14: 2,092,425 km (0.105 R)
• M15: 2,306,500 km (0.086 R)
• M16: 2,411,966 km (0.065 R)
• M17: 2,546,006 km (0.06 R)
• M18: 2,812,590 km (0.097 R)
• M19: 2,935,110 km (0.1 R)
• M20: 3,030,554 km (0.07 R)
• M21: 3,175,813 km (0.058 R)
• M22: 3,413,075 km (0.047 R)
• M23: 3,564,319 km (0.073 R)
• M24: 3,811,155 km (0.1 R)
• M25: 3,947,289 km (0.062 R)
• M26: 4,074,298 km (0.111 R)
• M27: 4,202,803 km (0.094 R)
• M28: 4,354,345 km (0.12 R)
• M29: 4,574,254 km (0.102 R)
• M30: 4,763,944 km (0.116 R)
• M31: 4,888,110 km (0.101 R)
• M32: 5,174,441 km (0.109 R)
• M33: 5,572,820 km (0.114 R)
• M34: 5,872,165 km (0.112 R)
• M35: 6,005,457 km (0.067 R)
• M36: 6,127,678 km (0.104 R)
• M37: 6,287,599 km (0.108 R)
• M38: 7,018,683 km (0.032 R)
• M39: 7,134,472 km (0.088 R)
• M40: 7,225,128 km (0.057 R)
• M41: 7,630,838 km (0.102 R)
• M42: 7,856,581 km (0.097 R)
• M43: 8,192,428 km (0.114 R)
• M44: 8,341,727 km (0.098 R)
• M45: 8,478,310 km (0.085 R)
• M46: 8,601,878 km (0.099 R)
• M47: 8,962,109 km (0.074 R)
• M48: 9,186,207 km (0.107 R)
• M49: 9,341,489 km (0.111 R)
• M50: 9,540,305 km (0.069 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.33 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 129.7

Radius: 12.4

Gravity: 0.84 G

Time & Orbit

Eccentricity (e): 0.181

Orbit Range: 1.09 AU - 1.57 AU

Year: 990 Days

Day: 8.9 Hours

Environment

Temp: -179 °C

Axial Tilt: 42.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (40)

Outer Limit: 43,109,690 km

• M1: 160,818 km (0.059 R)
• M2: 269,725 km (0.07 R)
• M3: 349,461 km (0.103 R)
• M4: 445,203 km (0.111 R)
• M5: 549,323 km (0.114 R)
• M6: 655,837 km (0.087 R)
• M7: 799,451 km (0.078 R)
• M8: 893,099 km (0.103 R)
• M9: 995,275 km (0.119 R)
• M10: 1,078,152 km (0.094 R)
• M11: 1,246,898 km (0.09 R)
• M12: 1,383,182 km (0.094 R)
• M13: 1,466,508 km (0.107 R)
• M14: 1,633,010 km (0.083 R)
• M15: 1,789,041 km (0.119 R)
• M16: 2,002,966 km (0.118 R)
• M17: 2,122,195 km (0.116 R)
• M18: 2,225,418 km (0.117 R)
• M19: 2,367,985 km (0.103 R)
• M20: 2,475,396 km (0.091 R)
• M21: 2,590,886 km (0.049 R)
• M22: 3,002,728 km (0.113 R)
• M23: 3,119,415 km (0.119 R)
• M24: 3,300,727 km (0.082 R)
• M25: 3,378,668 km (0.097 R)
• M26: 3,521,683 km (0.089 R)
• M27: 3,652,282 km (0.113 R)
• M28: 3,799,188 km (0.051 R)
• M29: 3,918,118 km (0.109 R)
• M30: 4,477,015 km (0.04 R)
• M31: 4,674,335 km (0.102 R)
• M32: 4,874,497 km (0.099 R)
• M33: 4,955,429 km (0.095 R)
• M34: 5,126,719 km (0.11 R)
• M35: 5,208,998 km (0.117 R)
• M36: 5,299,953 km (0.096 R)
• M37: 5,408,262 km (0.105 R)
• M38: 5,525,697 km (0.031 R)
• M39: 5,669,460 km (0.064 R)
• M40: 5,797,366 km (0.108 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.36 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 101.5

Radius: 14.2

Gravity: 0.5 G

Time & Orbit

Eccentricity (e): 0.021

Orbit Range: 1.33 AU - 1.39 AU

Year: 1024 Days

Day: 10.4 Hours

Environment

Temp: -168 °C

Axial Tilt: 34.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (37)

Outer Limit: 43,109,690 km

• M1: 181,163 km (0.062 R)
• M2: 302,786 km (0.104 R)
• M3: 394,490 km (0.101 R)
• M4: 540,198 km (0.11 R)
• M5: 650,152 km (0.062 R)
• M6: 742,604 km (0.07 R)
• M7: 868,715 km (0.072 R)
• M8: 1,073,066 km (0.063 R)
• M9: 1,232,836 km (0.117 R)
• M10: 1,323,193 km (0.109 R)
• M11: 1,495,829 km (0.102 R)
• M12: 1,713,494 km (0.071 R)
• M13: 1,892,114 km (0.064 R)
• M14: 2,003,415 km (0.117 R)
• M15: 2,105,590 km (0.086 R)
• M16: 2,286,005 km (0.101 R)
• M17: 2,405,085 km (0.048 R)
• M18: 2,508,158 km (0.108 R)
• M19: 2,637,410 km (0.118 R)
• M20: 2,775,340 km (0.115 R)
• M21: 2,941,693 km (0.097 R)
• M22: 3,078,425 km (0.109 R)
• M23: 3,324,663 km (0.093 R)
• M24: 3,440,003 km (0.078 R)
• M25: 3,549,957 km (0.072 R)
• M26: 3,688,934 km (0.094 R)
• M27: 3,801,431 km (0.056 R)
• M28: 3,936,668 km (0.107 R)
• M29: 4,087,911 km (0.068 R)
• M30: 4,433,632 km (0.12 R)
• M31: 4,621,527 km (0.119 R)
• M32: 4,720,262 km (0.082 R)
• M33: 4,812,115 km (0.103 R)
• M34: 4,912,196 km (0.078 R)
• M35: 5,059,849 km (0.035 R)
• M36: 5,248,492 km (0.051 R)
• M37: 5,399,436 km (0.03 R)

Planet 6 - Ice Giant

Semi-Major Axis: 6.65 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 831.9

Radius: 5.9

Gravity: 23.9 G

Time & Orbit

Eccentricity (e): 0.113

Orbit Range: 5.9 AU - 7.4 AU

Year: 11073 Days

Day: 17.8 Hours

Environment

Temp: -220 °C

Axial Tilt: 5.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 43,109,690 km

• M1: 154,385 km (0.11 R)
• M2: 227,987 km (0.102 R)
• M3: 431,291 km (0.104 R)
• M4: 560,693 km (0.088 R)
• M5: 759,209 km (0.052 R)
• M6: 979,268 km (0.107 R)
• M7: 1,173,745 km (0.106 R)
• M8: 1,287,140 km (0.056 R)
• M9: 1,404,126 km (0.096 R)
• M10: 1,986,510 km (0.116 R)
• M11: 2,260,873 km (0.095 R)
• M12: 2,431,265 km (0.065 R)
• M13: 2,845,202 km (0.074 R)
• M14: 2,967,423 km (0.085 R)
• M15: 3,091,440 km (0.058 R)
• M16: 3,217,252 km (0.119 R)
• M17: 3,312,546 km (0.091 R)
• M18: 4,074,896 km (0.108 R)
• M19: 4,816,453 km (0.113 R)
• M20: 5,072,864 km (0.037 R)
• M21: 5,675,294 km (0.12 R)
• M22: 5,829,530 km (0.088 R)
• M23: 6,181,534 km (0.11 R)
• M24: 6,300,314 km (0.089 R)
• M25: 6,380,050 km (0.061 R)
• M26: 6,865,046 km (0.067 R)
• M27: 7,445,785 km (0.076 R)
• M28: 7,487,822 km (0.045 R)
• M29: 8,786,930 km (0.032 R)
• M30: 8,965,400 km (0.036 R)
• M31: 9,145,067 km (0.099 R)
• M32: 9,235,275 km (0.062 R)
• M33: 9,371,259 km (0.071 R)
• M34: 9,462,215 km (0.099 R)
• M35: 9,921,630 km (0.078 R)
• M36: 10,294,428 km (0.114 R)
• M37: 10,671,863 km (0.116 R)
• M38: 10,862,301 km (0.079 R)
• M39: 12,127,002 km (0.046 R)
• M40: 12,275,852 km (0.107 R)
• M41: 12,475,415 km (0.047 R)
• M42: 13,181,966 km (0.085 R)
• M43: 13,232,979 km (0.068 R)
• M44: 13,283,992 km (0.028 R)
• M45: 14,213,892 km (0.075 R)
• M46: 14,792,387 km (0.107 R)
• M47: 15,111,330 km (0.11 R)
• M48: 15,164,587 km (0.104 R)
• M49: 15,809,802 km (0.078 R)
• M50: 16,135,776 km (0.105 R)
• M51: 16,299,586 km (0.111 R)
• M52: 17,071,211 km (0.063 R)
• M53: 17,349,763 km (0.075 R)
• M54: 18,936,996 km (0.063 R)
• M55: 19,109,782 km (0.108 R)
• M56: 19,283,016 km (0.061 R)
• M57: 20,688,338 km (0.115 R)
• M58: 21,463,255 km (0.099 R)
• M59: 23,968,571 km (0.081 R)
• M60: 26,564,692 km (0.036 R)
• M61: 26,952,001 km (0.076 R)
• M62: 27,536,630 km (0.112 R)
• M63: 29,448,341 km (0.036 R)
• M64: 31,470,754 km (0.092 R)
• M65: 31,607,188 km (0.086 R)
• M66: 31,880,503 km (0.083 R)
• M67: 32,086,200 km (0.117 R)
• M68: 32,498,641 km (0.109 R)
• M69: 33,259,347 km (0.118 R)
• M70: 33,676,874 km (0.118 R)
• M71: 33,816,299 km (0.057 R)
• M72: 34,727,949 km (0.062 R)
• M73: 36,432,168 km (0.026 R)
• M74: 38,236,019 km (0.117 R)
• M75: 39,405,725 km (0.093 R)
• M76: 39,699,984 km (0.051 R)
• M77: 40,661,300 km (0.12 R)
• M78: 41,331,349 km (0.115 R)
• M79: 41,405,998 km (0.086 R)
• M80: 42,080,086 km (0.058 R)
• M81: 43,667,020 km (0.078 R)
• M82: 43,743,165 km (0.088 R)
• M83: 43,895,456 km (0.098 R)
• M84: 44,429,670 km (0.098 R)
• M85: 45,427,488 km (0.027 R)
• M86: 47,055,113 km (0.088 R)
• M87: 47,133,053 km (0.097 R)
• M88: 47,601,893 km (0.112 R)
• M89: 47,836,762 km (0.077 R)
• M90: 49,096,525 km (0.103 R)
• M91: 52,050,934 km (0.032 R)
• M92: 52,778,278 km (0.069 R)
• M93: 53,508,914 km (0.066 R)
• M94: 53,997,950 km (0.056 R)

Planet 7 - Ice Giant

Semi-Major Axis: 8.48 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 410.4

Radius: 7.1

Gravity: 8.14 G

Time & Orbit

Eccentricity (e): 0.172

Orbit Range: 7.02 AU - 9.94 AU

Year: 15944 Days

Day: 24.1 Hours

Environment

Temp: -236 °C

Axial Tilt: 38.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 43,109,690 km

• M1: 120,576 km (0.115 R)
• M2: 199,713 km (0.051 R)
• M3: 293,062 km (0.106 R)
• M4: 545,434 km (0.061 R)
• M5: 741,257 km (0.101 R)
• M6: 818,001 km (0.118 R)
• M7: 1,152,053 km (0.113 R)
• M8: 1,196,633 km (0.102 R)
• M9: 1,241,962 km (0.096 R)
• M10: 1,334,263 km (0.036 R)
• M11: 1,803,402 km (0.028 R)
• M12: 2,179,791 km (0.091 R)
• M13: 2,377,110 km (0.032 R)
• M14: 2,639,505 km (0.072 R)
• M15: 3,034,593 km (0.116 R)
• M16: 4,434,230 km (0.072 R)
• M17: 5,236,374 km (0.062 R)
• M18: 5,463,015 km (0.109 R)
• M19: 6,441,236 km (0.111 R)
• M20: 6,888,533 km (0.101 R)
• M21: 8,159,068 km (0.109 R)
• M22: 9,135,792 km (0.08 R)
• M23: 9,226,449 km (0.109 R)
• M24: 9,915,646 km (0.028 R)
• M25: 10,055,520 km (0.043 R)
• M26: 10,242,966 km (0.045 R)
• M27: 10,337,213 km (0.055 R)
• M28: 10,716,743 km (0.075 R)
• M29: 11,052,590 km (0.071 R)
• M30: 11,391,878 km (0.114 R)
• M31: 11,538,484 km (0.091 R)
• M32: 13,550,426 km (0.093 R)
• M33: 14,490,648 km (0.09 R)
• M34: 14,702,479 km (0.074 R)
• M35: 15,022,020 km (0.056 R)
• M36: 15,668,283 km (0.119 R)
• M37: 16,323,372 km (0.116 R)
• M38: 16,876,136 km (0.1 R)
• M39: 17,773,424 km (0.114 R)
• M40: 19,438,897 km (0.089 R)
• M41: 20,024,573 km (0.105 R)
• M42: 20,201,397 km (0.116 R)
• M43: 20,260,488 km (0.097 R)
• M44: 21,393,692 km (0.115 R)
• M45: 22,059,253 km (0.102 R)
• M46: 22,302,948 km (0.109 R)
• M47: 23,596,671 km (0.099 R)
• M48: 24,284,222 km (0.062 R)
• M49: 25,105,066 km (0.09 R)
• M50: 25,168,495 km (0.047 R)
• M51: 25,359,382 km (0.089 R)
• M52: 25,806,680 km (0.107 R)
• M53: 25,999,212 km (0.111 R)
• M54: 26,127,717 km (0.071 R)
• M55: 26,385,624 km (0.111 R)
• M56: 26,450,100 km (0.029 R)
• M57: 27,164,131 km (0.117 R)
• M58: 27,884,295 km (0.105 R)
• M59: 27,950,118 km (0.091 R)
• M60: 28,743,585 km (0.102 R)
• M61: 29,410,493 km (0.08 R)
• M62: 29,477,512 km (0.108 R)
• M63: 29,880,379 km (0.117 R)
• M64: 30,082,486 km (0.065 R)
• M65: 31,715,945 km (0.082 R)
• M66: 32,197,651 km (0.032 R)
• M67: 32,681,899 km (0.12 R)
• M68: 34,219,466 km (0.118 R)
• M69: 34,501,458 km (0.1 R)
• M70: 34,642,828 km (0.084 R)
• M71: 35,139,044 km (0.098 R)
• M72: 35,566,146 km (0.067 R)
• M73: 36,210,165 km (0.072 R)
• M74: 36,497,542 km (0.111 R)
• M75: 36,930,179 km (0.077 R)
• M76: 37,509,572 km (0.108 R)
• M77: 38,750,785 km (0.101 R)
• M78: 39,783,011 km (0.053 R)
• M79: 40,451,414 km (0.062 R)
• M80: 40,600,413 km (0.049 R)
• M81: 41,573,697 km (0.083 R)
• M82: 44,846,898 km (0.057 R)
• M83: 45,387,545 km (0.096 R)
• M84: 45,464,887 km (0.114 R)
• M85: 46,241,450 km (0.06 R)
• M86: 47,100,740 km (0.067 R)
• M87: 47,257,519 km (0.029 R)
• M88: 48,835,028 km (0.107 R)
• M89: 49,470,819 km (0.118 R)
• M90: 51,233,531 km (0.1 R)
• M91: 54,161,759 km (0.119 R)
• M92: 55,150,003 km (0.099 R)

Planet 8 - Ice Giant

Semi-Major Axis: 9.37 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 145.3

Radius: 4.8

Gravity: 6.31 G

Time & Orbit

Eccentricity (e): 0.241

Orbit Range: 7.11 AU - 11.63 AU

Year: 18519 Days

Day: 16.8 Hours

Environment

Temp: -223 °C

Axial Tilt: 33.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 43,109,690 km

• M1: 63,579 km (0.091 R)
• M2: 146,756 km (0.111 R)
• M3: 599,887 km (0.041 R)
• M4: 1,421,030 km (0.061 R)
• M5: 1,608,925 km (0.12 R)
• M6: 2,147,777 km (0.041 R)
• M7: 2,363,347 km (0.07 R)
• M8: 2,486,017 km (0.11 R)
• M9: 2,610,932 km (0.069 R)
• M10: 2,892,774 km (0.056 R)
• M11: 3,050,600 km (0.077 R)
• M12: 3,402,304 km (0.117 R)
• M13: 3,709,878 km (0.091 R)
• M14: 3,939,062 km (0.095 R)
• M15: 4,471,780 km (0.092 R)
• M16: 4,623,621 km (0.061 R)
• M17: 4,839,342 km (0.11 R)
• M18: 4,870,308 km (0.043 R)
• M19: 4,995,372 km (0.067 R)
• M20: 5,058,203 km (0.116 R)
• M21: 5,121,334 km (0.051 R)
• M22: 5,965,664 km (0.108 R)
• M23: 6,099,404 km (0.108 R)
• M24: 6,957,348 km (0.1 R)
• M25: 7,275,543 km (0.094 R)
• M26: 7,816,040 km (0.08 R)
• M27: 9,011,925 km (0.117 R)
• M28: 9,358,544 km (0.088 R)
• M29: 10,064,496 km (0.098 R)
• M30: 10,144,082 km (0.077 R)
• M31: 10,706,420 km (0.078 R)
• M32: 12,368,303 km (0.101 R)
• M33: 12,410,789 km (0.079 R)
• M34: 12,882,321 km (0.11 R)
• M35: 13,272,323 km (0.116 R)
• M36: 13,316,006 km (0.07 R)
• M37: 13,798,459 km (0.067 R)
• M38: 14,197,586 km (0.116 R)
• M39: 14,690,511 km (0.076 R)
• M40: 15,417,407 km (0.085 R)
• M41: 15,554,887 km (0.089 R)
• M42: 15,923,945 km (0.118 R)
• M43: 17,428,152 km (0.099 R)
• M44: 17,523,745 km (0.091 R)
• M45: 17,619,338 km (0.108 R)
• M46: 18,634,659 km (0.078 R)
• M47: 18,683,428 km (0.102 R)
• M48: 18,781,265 km (0.077 R)
• M49: 18,830,183 km (0.057 R)
• M50: 20,318,084 km (0.113 R)
• M51: 21,076,246 km (0.046 R)
• M52: 21,586,674 km (0.044 R)
• M53: 22,049,679 km (0.11 R)
• M54: 22,308,184 km (0.109 R)
• M55: 22,672,006 km (0.038 R)
• M56: 23,195,000 km (0.058 R)
• M57: 23,247,509 km (0.108 R)
• M58: 23,457,993 km (0.083 R)
• M59: 23,563,460 km (0.07 R)
• M60: 23,933,864 km (0.114 R)
• M61: 24,040,079 km (0.119 R)
• M62: 24,734,063 km (0.11 R)
• M63: 25,326,471 km (0.114 R)
• M64: 25,380,625 km (0.083 R)
• M65: 26,196,532 km (0.114 R)
• M66: 26,251,135 km (0.067 R)
• M67: 26,470,296 km (0.117 R)
• M68: 26,525,198 km (0.098 R)
• M69: 28,245,424 km (0.102 R)
• M70: 28,864,460 km (0.104 R)
• M71: 29,772,968 km (0.103 R)
• M72: 30,230,588 km (0.101 R)
• M73: 30,806,091 km (0.099 R)
• M74: 30,921,581 km (0.093 R)
• M75: 30,979,325 km (0.115 R)
• M76: 31,037,220 km (0.043 R)
• M77: 33,261,890 km (0.069 R)
• M78: 33,380,371 km (0.109 R)
• M79: 33,499,002 km (0.12 R)
• M80: 33,677,323 km (0.072 R)
• M81: 35,054,222 km (0.086 R)
• M82: 35,355,961 km (0.11 R)
• M83: 35,416,398 km (0.09 R)
• M84: 36,266,413 km (0.094 R)
• M85: 36,388,485 km (0.051 R)
• M86: 36,510,557 km (0.096 R)
• M87: 37,000,341 km (0.117 R)
• M88: 37,369,099 km (0.062 R)
• M89: 37,615,637 km (0.073 R)
• M90: 39,607,383 km (0.078 R)
• M91: 39,795,876 km (0.071 R)
• M92: 40,047,649 km (0.116 R)
• M93: 40,236,741 km (0.102 R)
• M94: 41,123,407 km (0.119 R)
• M95: 41,378,023 km (0.098 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: 253 - 20,176 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit