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    Celestial Mechanics Calculator Calculation Mode: Orbital Period from DistanceSemi-Major Axis from PeriodOrbital VelocityEscape VelocityVis-Viva Equation Input 1: Input 2: Central Body: SunEarthMoonMarsJupiterCustom (enter GM) GM (km³/s²): Calculate * Based on Kepler’s 3rd Law and Newton’s gravity. Uses standard gravitational parameters from NASA JPL. Valid for circular and elliptical orbits. About the Celestial Mechanics […]

    Angular Diameter Calculator Actual Size (diameter): kilometers (km)meters (m)astronomical units (AU)light-years (ly)parsecs (pc)Earth diametersJupiter diameters Distance to Object: kilometers (km)meters (m)astronomical units (AU)light-years (ly)parsecs (pc) Calculate Angular Diameter * Based on small-angle approximation: δ ≈ D/d (radians). Valid for δ < 10°. Exact formula used for larger angles. About the Angular Diameter Calculator

    Cosmic Distance Calculator Distance Method: Parallax (mas)Cepheid Period-Luminosity (days, mag)Tully-Fisher (km/s, mag)Type Ia Supernova (mag, mag)Redshift (z, H₀)CMB Angular Size (θ, Ω_m, H₀) Input 1: Input 2: Calculate Distance * Based on peer-reviewed astronomical methods: Riess et al. (2022), Freedman et al. (2021), Planck Collaboration (2020). H₀ = 67.4 km/s/Mpc default. About the

    Dark Matter Calculator Dark Matter Profile: NFW (Navarro-Frenk-White)EinastoIsothermal (Cored) Circular Velocity at r₂₀₀ (km/s): Virial Radius r₂₀₀ (kpc): Concentration c = r₂₀₀/rₛ: Redshift z: Hubble Constant h: Calculate Dark Matter Halo * Based on Navarro et al. (1996), Springel et al. (2008), and Planck 2018 cosmology. About the Dark Matter Calculator The Dark

    Galactic Rotation Calculator Dark Matter Halo Model: NFW (Navarro-Frenk-White)Isothermal SphereFlat Rotation Curve Flat Rotation Velocity v₀ (km/s): Scale Radius rₛ (kpc): Virial Radius r₂₀₀ (kpc): Baryonic Disk Mass Mₔ (10¹⁰ M⊙): Disk Scale Length R_d (kpc): Calculate Rotation Curve * Based on Navarro et al. (1996), Binney & Tremaine (2008), and Milky Way

    Oort Cloud Calculator Semi-Major Axis a (AU): Eccentricity e: Inclination i (degrees): Comet Mass (kg): Comet Radius R (km): Time in Oort Cloud (Gyr): Calculate Oort Cloud Comet * Based on Heisler & Tremaine (1986), Dones et al. (2004), and galactic tide models. About the Oort Cloud Calculator The Oort Cloud Calculator is

    Kuiper Belt Calculator Semi-Major Axis a (AU): Eccentricity e: Inclination i (degrees): Estimated Mass (kg): Radius R (km): Albedo (0–1): Calculate Kuiper Belt Object * Based on Gladman et al. (2008), Lykawka & Mukai (2007), and TNO classification schemes. About the Kuiper Belt Calculator The Kuiper Belt Calculator is a scientifically accurate tool

    Cometary Orbit Calculator Perihelion Distance q (AU): Eccentricity e: Inclination i (degrees): Argument of Perihelion ω (degrees): Longitude of Ascending Node Ω (degrees): Epoch (MJD): Calculate Cometary Orbit * Based on Kepler’s laws, vis-viva equation, and two-body orbital mechanics (Murray & Dermott, 1999). About the Cometary Orbit Calculator The Cometary Orbit Calculator is

    Meteor Trajectory Calculator Entry Velocity v (km/s): Entry Angle θ (degrees from vertical): Initial Mass m₀ (kg): Density ρ (kg/m³): Entry Height h₀ (km): Ablation Coefficient σ (s²/km²): Calculate Trajectory * Based on Bronshten (1983), Ceplecha (1998), and meteoroid ablation models. About the Meteor Trajectory Calculator The Meteor Trajectory Calculator is a precision

    Tidal Locking Calculator Body Type: ExoplanetMoon Host Mass M (M☉ or M⊕): Semi-Major Axis a (AU or R⊕): Planet/Moon Radius Rₚ (R⊕): Tidal Quality Factor Q: Love Number k₂: Initial Spin Period (hours): Eccentricity e: Calculate Tidal Locking * Based on Goldreich & Peale (1966), Hut (1981), and Peale (1999) tidal evolution models.