The Asteroid Ephemeris 1900 to 2050

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We use two methods to obtain estimates of the uncertainty of the particle ejection event location and time. A least squares estimation is performed with each measurement weighting appropriately scaled to the expected errors in the OpNav astrometric processing and potential errors in the conic trajectory fit compared to a high-fidelity dynamical model. The a posteriori covariance is directly obtained from the estimation process. The least squares estimation has the potential to latch onto a local minima and overoptimistic uncertainties associated with the a posteriori state estimate. An alternate uncertainty quantification method is used to determine if the least squares estimation solution and associated uncertainty is appropriate. Namely, a Markov chain Monte Carlo analysis is performed for each of the data sets to provide insight into the a posteriori distribution of the system. Charlier, C. V. L. ( 1911). Second note on multiple solutions in the determination of orbits from three observation. MNRAS, 71( 5), 454– 460. https://doi.org/10.1093/mnras/71.5.454

We extend the work by Martikainen et al. (2021) by providing computational tools for the derivation of asteroid phase functions using fictitious spherical asteroids with equal surface properties. In earlier works, we have described these phase functions as being proper phase functions that describe the intrinsic properties of the surfaces. We apply the methods to the asteroids studied by Martikainen et al. (2021), by starting from their results of Markov-chain Monte Carlo (MCMC) lightcurve inversion for some 500 asteroids. Furthermore, we generalize the studies by Martikainen et al. (2021) and Muinonen et al. (2020) by incorporating a combined linear-exponential model of phase functions on the magnitude scale. The ephemerides above show the daily positions, month to month in the year 2020, of the four major asteroids, Chiron, and the minor asteroids Eros, Psyche, and Sappho.about -53 mas from the IAU2006/00A of-date system. International Terrestrial Reference Frame (ITRF93) Asteroids are small Solar System objects that originate from times preceding planet formation. Typically, when rotating about its principal axis of inertia, an asteroid exhibits a periodic change of brightness caused by the varying part of its surface being both illuminated by the Sun and visible to the observer. On one hand, a photometric lightcurve is the result of photometric observations extending over a time span covering a substantial part of the rotation period or more. On the other hand, a photometric phase curve is the result of observations of the change in an asteroid’s apparent brightness obtained at different epochs during a single apparition, corresponding to a slowly changing Sun-observer-object geometry. Note that the four major asteroids, included in the monthly ephemerides above for the year 2024, are Ceres, Juno, Vesta, and Pallas. Also added are Eros, Sappho, Psyche, and Chiron. This was a custom ephemeris built using the excellent and highly recommended software program, Sirius 3.0. Tools for Greater Understanding & Fulfillment Asteroid Ephemeris for the Next Years, 2026 and 2027, in PDF format only for now: AsteroidsEphemeris2026

Note that the four major asteroids, included in the monthly ephemerides above for the year 2023, are Ceres, Juno, Vesta, and Pallas. Also added are Eros, Sappho, Psyche, and Chiron. This was a custom ephemeris built using the excellent and highly recommended software program, Sirius 3.0. Tools for Greater Understanding & FulfillmentINFORMATION TO CORRECTLY UNDERSTAND EPHEMERIS LIMITATIONS AND UNCERTAINTIES. SPK File Generation Introduction Admissible regions can be used to help constrain the state space when angles-only IOD techniques are performed. The SSA community successfully utilizes admissible regions for space-based imaging platforms to constrain Earth orbiters. These admissible regions place constraints on the potential state space of the slant range, ρ i, and its rate, Next, the middle table shows the lunar sign ingresses (or sign changes). These are separated because the Moon changes signs so much more frequently than the Sun and other planets/bodies. The void Moon times are also displayed. Acton, C. H. ( 1996). Ancillary data services of NASA's Navigation and Ancillary Information Facility. Planetary and Space Science, 44( 1), 65– 70. https://doi.org/10.1016/0032-0633(95)00107-7 Eros represents objectification, passion and desire, the thrill of the chase, and creative power. In the birth chart, this asteroid can point to areas where we pour a lot of heart, passion, and enthusiasm.