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Add RA/DEC + rates to SimultaneousStates #144

Merged
merged 1 commit into from
Oct 25, 2024
Merged

Add RA/DEC + rates to SimultaneousStates #144

merged 1 commit into from
Oct 25, 2024

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dahlend
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@dahlend dahlend commented Oct 25, 2024 •
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Fixes #143

This adds RA/Dec on sky rates as projected onto the tangent plane.

    import kete
    import numpy as np
    jd = kete.Time(2460324.0607406627, scaling='utc').jd
    
    
    state = kete.HorizonsProperties.fetch("Eros").state
    obs = kete.spice.get_state("Earth", jd)
    fov = kete.OmniDirectionalFOV(obs)
    
    vis = kete.fov_state_check([state], [fov])[0]
    radec_rates = np.array(vis.ra_dec_with_rates)
    radec_rates[:, 2:] *= 60 * 60 / 24
    radec_rates[0]
    # [349.05471178,   5.38827149,  91.84545114,  34.03329178]
    # Same query from horizons:
    # 349.05471   5.38827  91.83002  34.07774

The slight discrepancy between the horizons rates and these look to be because horizons computes in the JNOW frame, not the J2000.

@dahlend dahlend merged commit d817021 into main Oct 25, 2024
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@dahlend dahlend deleted the radec branch October 25, 2024 15:44
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Add support for projected velocity calculations
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@dahlend