IOTA/IOTA-ES occultation update for (6712) Hornstein / UCAC4 336-118763 event on 2024 Oct 02, 10:25 UT Visible from Summary ------- On 2024 Oct 02 UT, the 9.245 km diameter asteroid (6712) Hornstein will occult a 11.8 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.07 mag to 18.90 mag (the magnitude of the asteroid) for at most 0.370 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: 99 * date and approx. time of event: 2024 Oct 02, 10:22 - 2024 Oct 02, 10:29 * geocentric midpoint of event [JD]: 2460585.93448954 * magnitude of target star: 11.83 * magnitude drop [mag]: 7.07 * estimated maximum duration [s]: 0.370 * Moon: 0 % sunlit, 83° distance * Sun: 79° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 89°) * approx speed of asteroid's shadow [km/s]: 25.2254 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 336-118763 by 6712 Hornstein on 2024 Oct 2 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 - 3 0 0 -33 7 22 10 22 15.4 1 117 53 -33 10 53 -33 3 52 -33 12 45 -33 1 59 .... - 2 0 0 -33 33 56 10 22 15.5 2 116 53 -33 37 27 -33 30 25 -33 39 20 -33 28 33 0.65 - 1 0 0 -34 0 31 10 22 15.7 3 116 53 -34 4 2 -33 57 0 -34 5 55 -33 55 7 0.68 0 0 0 -34 27 7 10 22 16.0 4 115 53 -34 30 38 -34 23 35 -34 32 31 -34 21 42 0.69 1 0 0 -34 53 42 10 22 16.4 5 115 54 -34 57 14 -34 50 10 -34 59 7 -34 48 18 0.70 2 0 0 -35 20 16 10 22 16.8 6 114 54 -35 23 48 -35 16 45 -35 25 41 -35 14 52 0.71 3 0 0 -35 46 49 10 22 17.4 6 114 54 -35 50 21 -35 43 17 -35 52 14 -35 41 24 0.71 4 0 0 -36 13 19 10 22 18.0 7 113 54 -36 16 51 -36 9 47 -36 18 44 -36 7 53 0.71 5 0 0 -36 39 45 10 22 18.7 8 112 54 -36 43 18 -36 36 13 -36 45 11 -36 34 20 0.72 6 0 0 -37 6 8 10 22 19.4 9 112 54 -37 9 40 -37 2 35 -37 11 34 -37 0 42 0.72 7 0 0 -37 32 25 10 22 20.3 10 111 54 -37 35 58 -37 28 53 -37 37 52 -37 26 59 0.72 8 0 0 -37 58 37 10 22 21.2 11 111 54 -38 2 10 -37 55 5 -38 4 4 -37 53 11 0.72 9 0 0 -38 24 43 10 22 22.2 12 110 54 -38 28 16 -38 21 10 -38 30 9 -38 19 17 0.72 10 0 0 -38 50 42 10 22 23.2 13 109 53 -38 54 14 -38 47 9 -38 56 8 -38 45 15 0.72 11 0 0 -39 16 33 10 22 24.3 14 109 53 -39 20 5 -39 13 0 -39 21 59 -39 11 6 0.72 12 0 0 -39 42 15 10 22 25.5 15 108 53 -39 45 48 -39 38 42 -39 47 42 -39 36 49 0.72 13 0 0 -40 7 48 10 22 26.8 15 107 53 -40 11 21 -40 4 16 -40 13 15 -40 2 22 0.72 14 0 0 -40 33 12 10 22 28.1 16 107 53 -40 36 45 -40 29 39 -40 38 39 -40 27 46 0.73 15 0 0 -40 58 25 10 22 29.4 17 106 52 -41 1 58 -40 54 53 -41 3 52 -40 52 59 0.73 16 0 0 -41 23 28 10 22 30.9 18 105 52 -41 27 0 -41 19 55 -41 28 54 -41 18 2 0.73 17 0 0 -41 48 18 10 22 32.4 19 104 52 -41 51 51 -41 44 46 -41 53 44 -41 42 52 0.73 18 0 0 -42 12 57 10 22 33.9 20 104 52 -42 16 29 -42 9 24 -42 18 23 -42 7 31 0.73 19 0 0 -42 37 22 10 22 35.5 20 103 51 -42 40 55 -42 33 50 -42 42 48 -42 31 57 0.73 20 0 0 -43 1 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-39 5 4 10 28 56.7 13 251 -47 -39 8 37 -39 1 32 -39 10 31 -38 59 38 0.77 -167 0 0 -38 39 10 10 28 57.8 12 250 -47 -38 42 43 -38 35 37 -38 44 36 -38 33 44 0.78 -166 0 0 -38 13 8 10 28 58.8 11 249 -48 -38 16 41 -38 9 36 -38 18 35 -38 7 42 0.78 -165 0 0 -37 47 0 10 28 59.7 10 249 -48 -37 50 33 -37 43 28 -37 52 26 -37 41 34 0.78 -164 0 0 -37 20 46 10 29 0.5 9 248 -49 -37 24 18 -37 17 13 -37 26 12 -37 15 20 0.79 -163 0 0 -36 54 26 10 29 1.3 8 248 -49 -36 57 59 -36 50 54 -36 59 52 -36 49 1 0.80 -162 0 0 -36 28 2 10 29 2.0 7 247 -50 -36 31 34 -36 24 30 -36 33 28 -36 22 37 0.80 -161 0 0 -36 1 34 10 29 2.6 6 246 -50 -36 5 6 -35 58 2 -36 7 0 -35 56 9 0.82 -160 0 0 -35 35 3 10 29 3.1 6 246 -51 -35 38 35 -35 31 32 -35 40 29 -35 29 39 0.83 -159 0 0 -35 8 30 10 29 3.6 5 245 -51 -35 12 2 -35 4 59 -35 13 55 -35 3 6 0.85 -158 0 0 -34 41 56 10 29 3.9 4 245 -52 -34 45 27 -34 38 24 -34 47 20 -34 36 32 0.88 -157 0 0 -34 15 21 10 29 4.2 3 244 -52 -34 18 52 -34 11 49 -34 20 45 -34 9 57 0.93 -156 0 0 -33 48 45 10 29 4.4 2 243 -52 -33 52 16 -33 45 15 -33 54 9 -33 43 22 1.03 -155 0 0 -33 22 11 10 29 4.6 1 243 -53 -33 25 42 -33 18 41 -33 27 35 -33 16 48 1.37 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 336-118763 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 54 25.2170 DE: -22 55 48.073 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 54 25.2169 DE: -22 55 48.073 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6712) Hornstein asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.21590 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 date of fit: 2023 Apr 27 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): 0.016", 0.002", 89.192° remarks: * orbital elements for (6712)Hornstein : Mean anomaly = 55.3566631465 deg Arg. of pericenter = 322.4658758897 deg Long. of node = 263.9536450383 deg Inclination = 0.9683226326 deg Eccentricity = 0.1247315631 Semimajor axis = 2.3984440557 AU Perihelion dist = 2.0992823796 AU Mag: H = 14.23, G = 0.15 Epoch of elements : MJD 60585.43448929 TDT (2024 Oct 02.4345) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr27,0.37,2024,10,2,10.427749,-0.001664,-0.585659,14.237873,-0.033919,0.005425,-0.000030,0.000000,0.000000 100.9290,-22.9356,20.89,-3.85,False UCAC4 336-118763,17.90700475,-22.9300204,12.27,11.83,11.59,0.0,0,,17.93189947,-22.9355533,7.08,6.86,0,0,0 6712,Hornstein,18.90,9.245,2.2159,0,0,4.090,-0.13,,0.8,0 0,55.2414,2024,10,2,322.4659,263.9536,0.9683,0.12473,2.39844,2.09928,14.23,5.0,0.15 1.267,0.0157,0.0015,89,0.0015,Known errors,0.74,0,-1,-1 20241002_118763,60140.60 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org