IOTA/IOTA-ES occultation update for (4000) Hipparchus / UCAC4 352-180475 event on 2024 Oct 20, 00:09 UT Visible from Summary ------- On 2024 Oct 20 UT, the 18.0148194531162 km diameter asteroid (4000) Hipparchus will occult a 11.9 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.46 mag to 18.34 mag (the magnitude of the asteroid) for at most 1.370 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: 97 * date and approx. time of event: 2024 Oct 20, 00:01 - 2024 Oct 20, 00:16 * geocentric midpoint of event [JD]: 2460603.50625500 * magnitude of target star: 11.88 * magnitude drop [mag]: 6.46 * estimated maximum duration [s]: 1.370 * Moon: 90 % sunlit, 121° distance * Sun: 95° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.004", 76°) * approx speed of asteroid's shadow [km/s]: 13.2955 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 352-180475 by 4000 Hipparchus on 2024 Oct 20 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 170 0 0 -36 47 58 0 1 39.9 0 114 63 -36 53 53 -36 42 3 -36 58 27 -36 37 30 .... 171 0 0 -37 9 51 0 1 40.0 1 114 63 -37 15 45 -37 3 56 -37 20 18 -36 59 24 0.40 172 0 0 -37 31 24 0 1 40.3 2 113 63 -37 37 18 -37 25 30 -37 41 50 -37 20 58 0.42 173 0 0 -37 52 37 0 1 40.6 3 113 62 -37 58 30 -37 46 44 -38 3 2 -37 42 13 0.43 174 0 0 -38 13 31 0 1 41.1 4 112 62 -38 19 23 -38 7 38 -38 23 55 -38 3 7 0.43 175 0 0 -38 34 4 0 1 41.7 5 111 62 -38 39 56 -38 28 12 -38 44 27 -38 23 42 0.43 176 0 0 -38 54 17 0 1 42.4 6 111 62 -39 0 8 -38 48 26 -39 4 38 -38 43 56 0.43 177 0 0 -39 14 9 0 1 43.2 6 110 61 -39 20 0 -39 8 19 -39 24 30 -39 3 50 0.43 178 0 0 -39 33 41 0 1 44.1 7 109 61 -39 39 31 -39 27 52 -39 44 0 -39 23 23 0.43 179 0 0 -39 52 52 0 1 45.1 8 109 60 -39 58 41 -39 47 3 -40 3 10 -39 42 35 0.43 -180 0 0 -40 11 42 0 1 46.2 9 108 60 -40 17 30 -40 5 54 -40 21 58 -40 1 26 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23 0.47 - 7 0 0 -10 52 23 0 16 11.7 11 252 -69 -10 58 15 -10 46 31 -11 2 46 -10 42 1 0.47 - 6 0 0 -10 27 18 0 16 13.5 10 252 -69 -10 33 9 -10 21 27 -10 37 40 -10 16 57 0.48 - 5 0 0 -10 2 33 0 16 15.2 9 252 -69 -10 8 23 - 9 56 42 -10 12 53 - 9 52 13 0.48 - 4 0 0 - 9 38 7 0 16 16.6 8 251 -70 - 9 43 57 - 9 32 17 - 9 48 26 - 9 27 49 0.49 - 3 0 0 - 9 14 2 0 16 17.9 7 251 -70 - 9 19 51 - 9 8 13 - 9 24 20 - 9 3 45 0.49 - 2 0 0 - 8 50 18 0 16 19.0 6 251 -70 - 8 56 6 - 8 44 30 - 9 0 34 - 8 40 2 0.50 - 1 0 0 - 8 26 55 0 16 19.9 5 251 -70 - 8 32 43 - 8 21 8 - 8 37 10 - 8 16 41 0.52 0 0 0 - 8 3 54 0 16 20.6 4 251 -70 - 8 9 41 - 7 58 8 - 8 14 8 - 7 53 41 0.54 1 0 0 - 7 41 16 0 16 21.2 3 251 -70 - 7 47 2 - 7 35 30 - 7 51 28 - 7 31 4 0.58 2 0 0 - 7 19 0 0 16 21.5 2 251 -70 - 7 24 45 - 7 13 15 - 7 29 11 - 7 8 50 0.66 3 0 0 - 6 57 7 0 16 21.7 1 250 -70 - 7 2 52 - 6 51 23 - 7 7 17 - 6 46 58 1.05 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 352-180475 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 15 27.5111 DE: -19 37 01.616 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 15 27.5111 DE: -19 37 01.616 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 13.1 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4000) Hipparchus asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.62220 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.010", 0.004", 76.245° remarks: * orbital elements for (4000)Hipparchus : Mean anomaly = 191.7872132368 deg Arg. of pericenter = 173.9716341376 deg Long. of node = 318.4094821620 deg Inclination = 2.7205097336 deg Eccentricity = 0.1159798737 Semimajor axis = 2.5883015015 AU Perihelion dist = 2.2881106202 AU Mag: H = 12.95, G = 0.15 Epoch of elements : MJD 60603.00625505 TDT (2024 Oct 20.0063) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,1.37,2024,10,20,0.150120,0.107779,-0.377277,7.214086,2.066937,0.005627,0.001287,0.000000,0.000000 -86.9813,-19.5420,173.95,-10.44,False UCAC4 352-180475,20.25764201,-19.6171154,13.14,11.88,11.20,0.1,4,,20.28154385,-19.5420432,6.46,6.69,0,0,0 4000,Hipparchus,18.34,18.205,2.6222,0,0,1.712,6.94,,1.4,0 0,191.5490,2024,10,19,173.9716,318.4095,2.7205,0.11598,2.58830,2.28811,12.94,5.0,0.15 1.385,0.0100,0.0037,76,0.0037,Known errors,1.07,0,-1,-1 20241020_180475,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org