IOTA/IOTA-ES occultation update for (647) Adelgunde / HIP 74626 event on 2024 Sep 07, 13:37 UT Visible from Summary ------- On 2024 Sep 07 UT, the 10.269 km diameter asteroid (647) Adelgunde will occult a 11.2 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.81 mag to 17.00 mag (the magnitude of the asteroid) for at most 0.380 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 Sep 07, 13:34 - 2024 Sep 07, 13:41 * geocentric midpoint of event [JD]: 2460561.06803692 * magnitude of target star: 11.20 * magnitude drop [mag]: 5.81 * estimated maximum duration [s]: 0.380 * Moon: 17 % sunlit, 17° distance * Sun: 66° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.001", 94°) * approx speed of asteroid's shadow [km/s]: 27.1874 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 74626 by 647 Adelgunde on 2024 Sep 7 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 - 52 0 0 - 3 44 12 13 34 10.5 1 109 61 - 3 47 14 - 3 41 9 - 3 49 10 - 3 39 14 .... - 51 0 0 - 4 4 59 13 34 10.6 2 109 61 - 4 8 1 - 4 1 56 - 4 9 57 - 4 0 0 0.25 - 50 0 0 - 4 25 59 13 34 10.8 3 109 62 - 4 29 2 - 4 22 56 - 4 30 58 - 4 21 0 0.25 - 49 0 0 - 4 47 13 13 34 11.0 4 108 63 - 4 50 16 - 4 44 10 - 4 52 12 - 4 42 13 0.25 - 48 0 0 - 5 8 39 13 34 11.4 5 108 64 - 5 11 42 - 5 5 36 - 5 13 39 - 5 3 39 0.25 - 47 0 0 - 5 30 18 13 34 11.8 6 108 65 - 5 33 21 - 5 27 14 - 5 35 18 - 5 25 18 0.26 - 46 0 0 - 5 52 8 13 34 12.3 7 108 65 - 5 55 12 - 5 49 5 - 5 57 9 - 5 47 8 0.26 - 45 0 0 - 6 14 10 13 34 12.9 8 108 66 - 6 17 14 - 6 11 6 - 6 19 11 - 6 9 9 0.26 - 44 0 0 - 6 36 23 13 34 13.6 9 108 67 - 6 39 27 - 6 33 19 - 6 41 24 - 6 31 22 0.26 - 43 0 0 - 6 58 46 13 34 14.4 10 108 67 - 7 1 50 - 6 55 42 - 7 3 47 - 6 53 44 0.26 - 42 0 0 - 7 21 19 13 34 15.2 11 108 68 - 7 24 23 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24 -25 20 26 -25 10 28 0.30 130 0 0 -24 55 59 13 41 44.6 5 252 -60 -24 59 2 -24 52 56 -25 0 59 -24 51 0 0.31 131 0 0 -24 36 17 13 41 44.9 4 251 -61 -24 39 21 -24 33 14 -24 41 17 -24 31 18 0.32 132 0 0 -24 16 22 13 41 45.1 3 251 -62 -24 19 25 -24 13 18 -24 21 22 -24 11 22 0.35 133 0 0 -23 56 12 13 41 45.3 2 250 -63 -23 59 16 -23 53 9 -24 1 13 -23 51 12 0.40 134 0 0 -23 35 50 13 41 45.4 1 250 -64 -23 38 53 -23 32 46 -23 40 50 -23 30 49 0.57 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: HIP 74626 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 14 52.0493 DE: -18 37 59.861 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 14 52.0489 DE: -18 37 59.859 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.2 * B mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (647) Adelgunde asteroid class: approx. diameter [km]: 10 approx. diameter ["]: 0.004 distance from Earth [AU]: 3.17110 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 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): 0.008", 0.001", 93.891° remarks: * orbital elements for (647)Adelgunde : Mean anomaly = 179.1374355161 deg Arg. of pericenter = 175.7513883891 deg Long. of node = 254.5529345754 deg Inclination = 7.3248277904 deg Eccentricity = 0.1929414098 Semimajor axis = 2.4431656463 AU Perihelion dist = 1.9717778221 AU Mag: H = 11.22, G = 0.15 Epoch of elements : MJD 60560.56803692 TDT (2024 Sep 07.5680) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.38,2024,9,7,13.632886,-0.042444,-0.239735,15.090855,-2.782988,0.005029,-0.001380,-0.000001,0.000000 37.4474,-18.7249,-25.03,5.74,False HIP 74626,15.24779152,-18.6332946,11.51,11.20,11.03,0.0,0,,15.27097149,-18.7249378,5.80,5.52,0,0,0 647,Adelgunde,17.00,10.269,3.1711,0,0,2.946,-7.72,,0.8,0 0,178.9908,2024,9,7,175.7514,254.5529,7.3248,0.19294,2.44317,1.97178,11.22,5.0,0.15 1.318,0.0080,0.0011,94,0.0014,Known errors,0.77,0,-1,-1 20240907__74626,60140.55 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org