IOTA/IOTA-ES occultation update for (925) Alphonsina / UCAC4 439-120164 event on 2024 Jul 26, 06:26 UT Visible from Summary ------- On 2024 Jul 26 UT, the 59.725 km diameter asteroid (925) Alphonsina will occult a 12.0 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.27 mag to 12.83 mag (the magnitude of the asteroid) for at most 4.420 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2024 Jul 26, 06:18 - 2024 Jul 26, 06:34 * geocentric midpoint of event [JD]: 2460517.76856521 * magnitude of target star: 11.97 * magnitude drop [mag]: 1.27 * estimated maximum duration [s]: 4.420 * Moon: 71 % sunlit, 43° distance * Sun: 154° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 61 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.002", 55°) * approx speed of asteroid's shadow [km/s]: 13.5054 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 439-120164 by 925 Alphonsina on 2024 Jul 26 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -167 0 0 3 57 34 6 34 29.3 0 92 -17 4 14 0 3 41 6 4 20 35 3 34 30 .... -166 0 0 3 55 6 6 34 29.2 1 92 -18 4 11 33 3 38 38 4 18 8 3 32 3 0.11 -165 0 0 3 52 24 6 34 29.0 2 92 -19 4 8 51 3 35 56 4 15 26 3 29 20 0.14 -164 0 0 3 49 26 6 34 28.6 3 92 -20 4 5 53 3 32 58 4 12 28 3 26 22 0.15 -163 0 0 3 46 13 6 34 28.1 4 92 -21 4 2 41 3 29 45 4 9 16 3 23 9 0.16 -162 0 0 3 42 46 6 34 27.4 5 93 -22 3 59 14 3 26 17 4 5 49 3 19 41 0.16 -161 0 0 3 39 4 6 34 26.6 6 93 -23 3 55 31 3 22 35 4 2 7 3 15 59 0.16 -160 0 0 3 35 6 6 34 25.7 7 93 -24 3 51 34 3 18 37 3 58 10 3 12 1 0.16 -159 0 0 3 30 55 6 34 24.6 8 93 -25 3 47 23 3 14 25 3 53 59 3 7 49 0.16 -158 0 0 3 26 28 6 34 23.3 9 93 -26 3 42 57 3 9 59 3 49 33 3 3 22 0.16 -157 0 0 3 21 47 6 34 21.9 10 93 -27 3 38 16 3 5 18 3 44 52 2 58 41 0.17 -156 0 0 3 16 52 6 34 20.4 11 93 -28 3 33 21 3 0 22 3 39 57 2 53 45 0.17 -155 0 0 3 11 42 6 34 18.7 12 93 -29 3 28 12 2 55 12 3 34 48 2 48 35 0.17 -154 0 0 3 6 18 6 34 16.9 13 93 -30 3 22 48 2 49 48 3 29 25 2 43 11 0.17 -153 0 0 3 0 40 6 34 15.0 14 93 -31 3 17 11 2 44 9 3 23 47 2 37 32 0.17 -152 0 0 2 54 49 6 34 12.9 15 93 -32 3 11 19 2 38 17 3 17 56 2 31 40 0.17 -151 0 0 2 48 43 6 34 10.7 16 93 -32 3 5 14 2 32 11 3 11 50 2 25 33 0.17 -150 0 0 2 42 23 6 34 8.3 17 93 -33 2 58 54 2 25 51 3 5 31 2 19 13 0.17 -149 0 0 2 35 50 6 34 5.8 18 93 -34 2 52 21 2 19 17 2 58 58 2 12 39 0.17 -148 0 0 2 29 3 6 34 3.1 19 93 -35 2 45 35 2 12 30 2 52 12 2 5 52 0.17 -147 0 0 2 22 3 6 34 0.4 20 93 -36 2 38 35 2 5 29 2 45 13 1 58 51 0.17 -146 0 0 2 14 49 6 33 57.5 21 93 -37 2 31 22 1 58 15 2 38 0 1 51 37 0.17 -145 0 0 2 7 23 6 33 54.4 22 93 -38 2 23 56 1 50 48 2 30 34 1 44 10 0.17 -144 0 0 1 59 43 6 33 51.2 23 93 -39 2 16 17 1 43 8 2 22 54 1 36 30 0.17 -143 0 0 1 51 50 6 33 47.9 24 93 -40 2 8 24 1 35 15 2 15 3 1 28 36 0.17 -142 0 0 1 43 45 6 33 44.5 25 93 -41 2 0 20 1 27 10 2 6 58 1 20 31 0.17 -141 0 0 1 35 27 6 33 40.9 26 93 -42 1 52 2 1 18 51 1 58 41 1 12 12 0.17 -140 0 0 1 26 57 6 33 37.2 27 93 -43 1 43 32 1 10 20 1 50 11 1 3 41 0.17 -139 0 0 1 18 14 6 33 33.4 28 93 -44 1 34 50 1 1 37 1 41 29 0 54 58 0.17 -138 0 0 1 9 20 6 33 29.4 29 93 -45 1 25 56 0 52 42 1 32 35 0 46 3 0.17 -137 0 0 1 0 13 6 33 25.3 30 93 -46 1 16 50 0 43 35 1 23 29 0 36 55 0.17 -136 0 0 0 50 54 6 33 21.1 31 93 -47 1 7 32 0 34 16 1 14 11 0 27 36 0.17 -135 0 0 0 41 24 6 33 16.8 32 93 -47 0 58 2 0 24 46 1 4 42 0 18 5 0.17 -134 0 0 0 31 43 6 33 12.3 33 93 -48 0 48 21 0 15 4 0 55 1 0 8 23 0.17 -133 0 0 0 21 50 6 33 7.7 34 93 -49 0 38 29 0 5 10 0 45 9 - 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1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.011", 0.002", 55.076° remarks: * orbital elements for (925)Alphonsina : Mean anomaly = 179.0942938041 deg Arg. of pericenter = 201.4631753699 deg Long. of node = 299.5108851095 deg Inclination = 21.1023394776 deg Eccentricity = 0.0813312222 Semimajor axis = 2.6993233965 AU Perihelion dist = 2.4797841254 AU Mag: H = 8.44, G = 0.15 Epoch of elements : MJD 60517.26856546 TDT (2024 Jul 26.2686) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1132023Apr24,4.42,2024,7,26,6.445565,-0.040745,-0.165942,-7.403431,1.815770,-0.001807,-0.001663,0.000001,0.000000 -75.3110,-2.1845,84.96,19.31,False UCAC4 439-120164,21.69973136,-2.2972252,12.18,11.97,11.86,0.0,0,,21.72122330,-2.1845301,1.27,1.05,0,0,0 925,Alphonsina,12.83,59.725,1.9708,0,0,-2.204,8.10,,3.2,0 0,179.0346,2024,7,26,201.4632,299.5109,21.1023,0.08133,2.69932,2.47978,8.44,5.0,0.15 1.200,0.0110,0.0020,55,0.0084,Known errors,1.79,0,-1,-1 20240726_120164,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org