IOTA/IOTA-ES occultation update for (858) El / TYC 5557-01203-1 event on 2024 Jul 23, 23:54 UT Visible from Summary ------- On 2024 Jul 23 UT, the 23.446652730232 km diameter asteroid (858) El will occult a 10.4 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.82 mag to 15.24 mag (the magnitude of the asteroid) for at most 1.360 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 23, 23:48 - 2024 Jul 24, 00:01 * geocentric midpoint of event [JD]: 2460515.49650071 * magnitude of target star: 10.43 * magnitude drop [mag]: 4.82 * estimated maximum duration [s]: 1.360 * Moon: 91 % sunlit, 124° distance * Sun: 92° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.001", 117°) * approx speed of asteroid's shadow [km/s]: 17.4204 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5557-01203-1 by 858 El on 2024 Jul 23 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 -169 0 0 36 45 18 23 48 53.7 0 104 72 36 38 42 36 51 55 36 37 3 36 53 33 .... -168 0 0 36 33 5 23 48 53.8 1 105 72 36 26 28 36 39 42 36 24 49 36 41 21 0.00 -167 0 0 36 20 22 23 48 53.9 2 105 72 36 13 43 36 27 0 36 12 4 36 28 39 -0.03 -166 0 0 36 7 8 23 48 54.1 3 106 72 36 0 29 36 13 48 35 58 50 36 15 27 -0.05 -165 0 0 35 53 24 23 48 54.4 4 106 71 35 46 44 36 0 5 35 45 5 36 1 44 -0.06 -164 0 0 35 39 10 23 48 54.8 5 107 71 35 32 29 35 45 51 35 30 49 35 47 31 -0.06 -163 0 0 35 24 25 23 48 55.3 5 107 71 35 17 43 35 31 7 35 16 2 35 32 47 -0.07 -162 0 0 35 9 9 23 48 55.9 6 108 70 35 2 25 35 15 52 35 0 45 35 17 33 -0.07 -161 0 0 34 53 21 23 48 56.5 7 109 70 34 46 37 35 0 6 34 44 56 35 1 46 -0.07 -160 0 0 34 37 2 23 48 57.2 8 109 70 34 30 16 34 43 48 34 28 35 34 45 29 -0.07 -159 0 0 34 20 12 23 48 58.1 9 110 69 34 13 25 34 26 58 34 11 43 34 28 40 -0.07 -158 0 0 34 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-0.10 - 11 0 0 -27 56 54 0 0 50.8 + 14 265 -76 -28 3 20 -27 50 28 -28 4 56 -27 48 52 -0.10 - 10 0 0 -27 53 10 0 0 52.1 + 13 264 -77 -27 59 37 -27 46 44 -28 1 13 -27 45 8 -0.10 - 9 0 0 -27 48 55 0 0 53.4 + 12 264 -77 -27 55 22 -27 42 29 -27 56 58 -27 40 52 -0.10 - 8 0 0 -27 44 9 0 0 54.6 + 11 264 -78 -27 50 36 -27 37 42 -27 52 12 -27 36 6 -0.10 - 7 0 0 -27 38 51 0 0 55.7 + 10 263 -79 -27 45 18 -27 32 24 -27 46 55 -27 30 47 -0.10 - 6 0 0 -27 33 2 0 0 56.7 + 10 263 -80 -27 39 29 -27 26 34 -27 41 6 -27 24 57 -0.10 - 5 0 0 -27 26 41 0 0 57.6 + 9 262 -80 -27 33 9 -27 20 13 -27 34 46 -27 18 36 -0.09 - 4 0 0 -27 19 49 0 0 58.4 + 8 262 -81 -27 26 17 -27 13 20 -27 27 54 -27 11 43 -0.09 - 3 0 0 -27 12 25 0 0 59.1 + 7 261 -81 -27 18 54 -27 5 56 -27 20 31 -27 4 19 -0.09 - 2 0 0 -27 4 29 0 0 59.8 + 6 261 -82 -27 10 59 -26 58 0 -27 12 36 -26 56 23 -0.09 - 1 0 0 -26 56 2 0 1 0.4 + 5 260 -82 -27 2 32 -26 49 32 -27 4 10 -26 47 55 -0.09 0 0 0 -26 47 3 0 1 0.8 + 4 260 -83 -26 53 34 -26 40 33 -26 55 12 -26 38 55 -0.09 1 0 0 -26 37 33 0 1 1.2 + 3 259 -83 -26 44 4 -26 31 1 -26 45 42 -26 29 24 -0.09 2 0 0 -26 27 30 0 1 1.5 + 2 259 -83 -26 34 2 -26 20 58 -26 35 40 -26 19 20 -0.08 3 0 0 -26 16 56 0 1 1.7 + 1 259 -83 -26 23 29 -26 10 23 -26 25 6 -26 8 45 -0.08 4 0 0 -26 5 49 0 1 1.8 + 1 258 -83 -26 12 23 -25 59 16 -26 14 1 -25 57 38 -0.05 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 5557-01203-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 05 21.8996 DE: -10 48 17.057 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 05 21.8995 DE: -10 48 17.057 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.4 * B mag [mag]: 11.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (858) El asteroid class: approx. diameter [km]: 23 approx. diameter ["]: 0.014 distance from Earth [AU]: 2.27980 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): 0.015", 0.001", 117.321° remarks: * orbital elements for (858)El : Mean anomaly = 353.1650281085 deg Arg. of pericenter = 177.8969605289 deg Long. of node = 67.1088998876 deg Inclination = 8.8671128326 deg Eccentricity = 0.1035434476 Semimajor axis = 2.8112238880 AU Perihelion dist = 2.5201400748 AU Mag: H = 10.33, G = 0.15 Epoch of elements : MJD 60514.99650071 TDT (2024 Jul 23.9965) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,1.36,2024,7,23,23.916017,0.051094,0.082089,8.347249,-5.196436,0.005102,-0.001841,0.000000,0.000000 -89.2778,-10.9223,-177.10,19.80,False TYC 5557-01203-1,14.08941658,-10.8047382,11.02,10.43,10.11,0.1,0,,14.11126606,-10.9223189,4.83,4.70,0,0,0 858,El,15.24,23.612,2.2798,0,0,2.187,-20.05,,1.4,0 0,352.9567,2024,7,23,177.8970,67.1089,8.8671,0.10354,2.81122,2.52014,10.33,5.0,0.15 1.125,0.0150,0.0013,117,0.0018,Known errors,1.12,0,-1,-1 20240723_1203-1,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org