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Velocity of comets

Web can know comets velocity in km/seg with safari programs?

5 comments

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    Jose Roberto Victor Manuel Salas

    I was searching this

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    Bill Tschumy

    The object Info on comets shows:

    Motion in:

    R.A (sec/day)

    Dec (arcsec/day)

    Total (arches/day

    Azimuth (arcsrc/sec)

    Altitude (arches/sec)

    Radial velocity (km/sec)

    Is that was you are asking for?

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    Jose Roberto Victor Manuel Salas

    We need the same to Hubble expansion velocity in km/seg. To compare them with the speed of expansion

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    Bill Tschumy

    The speed of expansion depends upon how far apart two galaxies are.    The Hubble constant is around 72 (km/sec)/Mpc so two points separated by 1 megaparsec (3.09×1019 km) would be flying apart at around 72 km/sec.  This is roughly equivalent to the speeds of comets through space (10-80 km/sec).

    But this really seems to be comparing apples to oranges.  I don't understand why you'd want to compare these.  In any case, SkySafari does not directly report the speed of comets relative to (say) the Sun.

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    Jose Roberto Victor Manuel Salas

    Hi Bill
    If I move faster than a bullet this will not fall to me. Likewise no star can travel above the Hubble constant. This ensures that there are no collisions in space. If no one flies above that is our guarantee and it is the first thing that we should determine in comets.
    I know Halley is 55 km/seg lower than Hubble constant.  Thanks for your ask If we can do this please show me or give me this velocitys
    God bless you 
    JR Víctor Salas

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