IOTA/IOTA-ES occultation update for (2505) Hebei / UCAC4 328-108497 event on 2024 Oct 08, 00:42 UT Visible from Summary ------- On 2024 Oct 08 UT, the 23.4628135972889 km diameter asteroid (2505) Hebei will occult a 11.8 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.35 mag to 17.12 mag (the magnitude of the asteroid) for at most 0.780 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 Oct 08, 00:39 - 2024 Oct 08, 00:45 * geocentric midpoint of event [JD]: 2460591.52941938 * magnitude of target star: 11.78 * magnitude drop [mag]: 5.35 * estimated maximum duration [s]: 0.780 * Moon: 23 % sunlit, 11° distance * Sun: 68° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.001", 96°) * approx speed of asteroid's shadow [km/s]: 30.5279 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 328-108497 by 2505 Hebei on 2024 Oct 8 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 132 0 0 -28 12 9 0 39 28.7 0 118 50 -28 20 58 -28 3 20 -28 23 28 -28 0 51 .... 133 0 0 -28 40 45 0 39 28.8 1 117 51 -28 49 35 -28 31 56 -28 52 5 -28 29 26 0.58 134 0 0 -29 9 28 0 39 28.9 2 117 51 -29 18 20 -29 0 38 -29 20 50 -28 58 9 0.62 135 0 0 -29 38 18 0 39 29.2 3 116 52 -29 47 10 -29 29 27 -29 49 40 -29 26 56 0.64 136 0 0 -30 7 12 0 39 29.5 4 116 52 -30 16 5 -29 58 20 -30 18 36 -29 55 49 0.65 137 0 0 -30 36 10 0 39 29.8 5 115 53 -30 45 3 -30 27 17 -30 47 35 -30 24 46 0.66 138 0 0 -31 5 11 0 39 30.3 6 115 53 -31 14 5 -30 56 17 -31 16 37 -30 53 46 0.66 139 0 0 -31 34 14 0 39 30.8 7 114 53 -31 43 9 -31 25 19 -31 45 41 -31 22 48 0.66 140 0 0 -32 3 18 0 39 31.4 8 114 54 -32 12 14 -31 54 23 -32 14 46 -31 51 52 0.66 141 0 0 -32 32 23 0 39 32.1 9 113 54 -32 41 20 -32 23 27 -32 43 52 -32 20 56 0.67 142 0 0 -33 1 27 0 39 32.8 10 113 54 -33 10 25 -32 52 31 -33 12 57 -32 50 0 0.67 143 0 0 -33 30 30 0 39 33.6 11 112 55 -33 39 28 -33 21 34 -33 42 1 -33 19 2 0.67 144 0 0 -33 59 31 0 39 34.5 12 112 55 -34 8 29 -33 50 34 -34 11 2 -33 48 2 0.67 145 0 0 -34 28 28 0 39 35.5 13 111 55 -34 37 27 -34 19 31 -34 40 0 -34 16 58 0.67 146 0 0 -34 57 22 0 39 36.5 14 110 55 -35 6 21 -34 48 23 -35 8 54 -34 45 51 0.67 147 0 0 -35 26 10 0 39 37.5 15 110 55 -35 35 10 -35 17 11 -35 37 43 -35 14 39 0.67 148 0 0 -35 54 52 0 39 38.6 16 109 55 -36 3 52 -35 45 54 -36 6 25 -35 43 21 0.67 149 0 0 -36 23 28 0 39 39.8 17 108 55 -36 32 29 -36 14 29 -36 35 2 -36 11 57 0.67 150 0 0 -36 51 57 0 39 41.1 18 108 56 -37 0 57 -36 42 58 -37 3 30 -36 40 25 0.67 151 0 0 -37 20 17 0 39 42.4 19 107 56 -37 29 18 -37 11 18 -37 31 51 -37 8 45 0.67 152 0 0 -37 48 28 0 39 43.7 20 106 55 -37 57 29 -37 39 29 -38 0 2 -37 36 56 0.67 153 0 0 -38 16 29 0 39 45.1 21 106 55 -38 25 30 -38 7 30 -38 28 3 -38 4 57 0.68 154 0 0 -38 44 20 0 39 46.5 21 105 55 -38 53 20 -38 35 20 -38 55 53 -38 32 48 0.68 155 0 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18 -40 45 48 -40 22 45 0.71 - 33 0 0 -40 7 20 0 45 8.1 13 249 -41 -40 16 20 -39 58 22 -40 18 53 -39 55 49 0.72 - 32 0 0 -39 40 11 0 45 9.0 12 248 -42 -39 49 11 -39 31 12 -39 51 44 -39 28 40 0.72 - 31 0 0 -39 12 49 0 45 9.8 12 248 -42 -39 21 49 -39 3 50 -39 24 22 -39 1 18 0.72 - 30 0 0 -38 45 15 0 45 10.6 11 247 -43 -38 54 16 -38 36 16 -38 56 49 -38 33 44 0.73 - 29 0 0 -38 17 30 0 45 11.3 10 246 -44 -38 26 31 -38 8 31 -38 29 4 -38 5 59 0.73 - 28 0 0 -37 49 35 0 45 12.0 9 246 -44 -37 58 35 -37 40 36 -38 1 8 -37 38 3 0.74 - 27 0 0 -37 21 29 0 45 12.6 8 245 -45 -37 30 29 -37 12 30 -37 33 3 -37 9 58 0.74 - 26 0 0 -36 53 15 0 45 13.1 7 244 -46 -37 2 15 -36 44 16 -37 4 48 -36 41 44 0.75 - 25 0 0 -36 24 52 0 45 13.6 6 244 -47 -36 33 52 -36 15 54 -36 36 25 -36 13 21 0.77 - 24 0 0 -35 56 22 0 45 14.0 5 243 -47 -36 5 22 -35 47 24 -36 7 55 -35 44 51 0.78 - 23 0 0 -35 27 46 0 45 14.4 4 243 -48 -35 36 45 -35 18 47 -35 39 18 -35 16 15 0.80 - 22 0 0 -34 59 3 0 45 14.7 3 242 -49 -35 8 2 -34 50 5 -35 10 35 -34 47 33 0.84 - 21 0 0 -34 30 16 0 45 14.9 2 242 -49 -34 39 14 -34 21 18 -34 41 47 -34 18 46 0.91 - 20 0 0 -34 1 24 0 45 15.0 1 241 -50 -34 10 22 -33 52 27 -34 12 55 -33 49 56 1.06 - 19 0 0 -33 32 30 0 45 15.1 0 240 -50 -33 41 27 -33 23 33 -33 44 0 -33 21 2 1.92 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 328-108497 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 28 29.1154 DE: -24 35 16.221 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 28 29.1153 DE: -24 35 16.221 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2505) Hebei asteroid class: approx. diameter [km]: 23 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.82910 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.021", 0.001", 95.712° remarks: * orbital elements for (2505)Hebei : Mean anomaly = 12.3221191359 deg Arg. of pericenter = 206.6950621867 deg Long. of node = 59.2278217406 deg Inclination = 2.0771172274 deg Eccentricity = 0.1719018845 Semimajor axis = 3.1455483575 AU Perihelion dist = 2.6048226670 AU Mag: H = 11.75, G = 0.15 Epoch of elements : MJD 60591.02941942 TDT (2024 Oct 08.0294) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,0.78,2024,10,8,0.706065,-0.030033,-0.556794,17.206453,-0.916102,0.005280,-0.000323,-0.000001,0.000000 -125.2410,-24.6089,166.30,-6.00,False UCAC4 328-108497,17.47475431,-24.5878391,12.85,11.78,11.20,0.1,0,,17.49984952,-24.6088555,5.35,5.48,0,0,0 2505,Hebei,17.12,23.668,2.8291,0,0,3.922,-2.84,,1.2,0 0,12.1403,2024,10,7,206.6951,59.2278,2.0771,0.17190,3.14555,2.60482,11.75,5.0,0.15 1.142,0.0210,0.0013,96,0.0016,Known errors,0.82,0,-1,-1 20241008_108497,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org