IOTA/IOTA-ES occultation update for (8022) Scottcrossfield / UCAC4 323-209081 event on 2024 Mar 31, 14:30 UT Visible from Summary ------- On 2024 Mar 31 UT, the 8.746 km diameter asteroid (8022) Scottcrossfield will occult a 11.4 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 7.31 mag to 18.70 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: 92 * date and approx. time of event: 2024 Mar 31, 14:26 - 2024 Mar 31, 14:34 * geocentric midpoint of event [JD]: 2460401.10443946 * magnitude of target star: 11.39 * magnitude drop [mag]: 7.31 * estimated maximum duration [s]: 0.380 * Moon: 66 % sunlit, 28° distance * Sun: 81° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.49 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 79°) * approx speed of asteroid's shadow [km/s]: 22.8341 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 323-209081 by 8022 Scottcrossfield on 2024 Mar 31 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 137 0 0 -36 25 36 14 26 33.7 1 121 -57 -36 29 1 -36 22 12 -36 32 19 -36 18 54 .... 138 0 0 -36 55 56 14 26 33.8 2 121 -57 -36 59 20 -36 52 31 -37 2 39 -36 49 13 0.63 139 0 0 -37 26 7 14 26 34.1 3 120 -57 -37 29 32 -37 22 43 -37 32 50 -37 19 25 0.65 140 0 0 -37 56 10 14 26 34.4 4 120 -56 -37 59 35 -37 52 45 -38 2 54 -37 49 27 0.67 141 0 0 -38 26 4 14 26 34.8 5 119 -56 -38 29 29 -38 22 39 -38 32 47 -38 19 21 0.67 142 0 0 -38 55 47 14 26 35.3 5 118 -56 -38 59 12 -38 52 22 -39 2 30 -38 49 4 0.68 143 0 0 -39 25 18 14 26 35.9 6 118 -55 -39 28 43 -39 21 53 -39 32 2 -39 18 35 0.68 144 0 0 -39 54 38 14 26 36.5 7 117 -55 -39 58 3 -39 51 13 -40 1 21 -39 47 55 0.68 145 0 0 -40 23 44 14 26 37.2 8 116 -54 -40 27 9 -40 20 20 -40 30 28 -40 17 2 0.68 146 0 0 -40 52 37 14 26 38.1 9 116 -54 -40 56 2 -40 49 13 -40 59 20 -40 45 55 0.69 147 0 0 -41 21 16 14 26 38.9 10 115 -53 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59 -35 37 10 -35 47 18 -35 33 52 0.72 - 31 0 0 -35 9 45 14 33 56.2 18 251 50 -35 13 10 -35 6 21 -35 16 28 -35 3 3 0.73 - 30 0 0 -34 38 51 14 33 57.9 17 251 50 -34 42 15 -34 35 27 -34 45 33 -34 32 9 0.73 - 29 0 0 -34 7 53 14 33 59.6 16 250 51 -34 11 17 -34 4 29 -34 14 35 -34 1 12 0.73 - 28 0 0 -33 36 52 14 34 1.2 15 250 51 -33 40 16 -33 33 29 -33 43 34 -33 30 12 0.73 - 27 0 0 -33 5 50 14 34 2.8 14 249 51 -33 9 14 -33 2 27 -33 12 31 -32 59 10 0.73 - 26 0 0 -32 34 48 14 34 4.2 14 248 51 -32 38 11 -32 31 24 -32 41 28 -32 28 8 0.74 - 25 0 0 -32 3 45 14 34 5.5 13 248 52 -32 7 8 -32 0 23 -32 10 25 -31 57 6 0.74 - 24 0 0 -31 32 44 14 34 6.8 12 247 52 -31 36 7 -31 29 22 -31 39 23 -31 26 6 0.74 - 23 0 0 -31 1 46 14 34 7.9 11 247 52 -31 5 8 -30 58 24 -31 8 24 -30 55 9 0.75 - 22 0 0 -30 30 51 14 34 9.0 10 246 52 -30 34 13 -30 27 30 -30 37 29 -30 24 15 0.76 - 21 0 0 -30 0 1 14 34 9.9 9 246 52 -30 3 22 -29 56 40 -30 6 37 -29 53 25 0.76 - 20 0 0 -29 29 16 14 34 10.8 8 245 52 -29 32 37 -29 25 55 -29 35 52 -29 22 41 0.77 - 19 0 0 -28 58 38 14 34 11.5 7 245 52 -29 1 58 -28 55 18 -29 5 13 -28 52 4 0.78 - 18 0 0 -28 28 7 14 34 12.1 6 244 52 -28 31 27 -28 24 47 -28 34 41 -28 21 34 0.80 - 17 0 0 -27 57 45 14 34 12.7 5 244 52 -28 1 5 -27 54 25 -28 4 18 -27 51 13 0.82 - 16 0 0 -27 27 32 14 34 13.1 4 243 52 -27 30 51 -27 24 13 -27 34 4 -27 21 1 0.86 - 15 0 0 -26 57 30 14 34 13.4 2 243 52 -27 0 48 -26 54 11 -27 4 1 -26 50 59 0.92 - 14 0 0 -26 27 39 14 34 13.6 1 242 52 -26 30 57 -26 24 21 -26 34 9 -26 21 9 1.08 - 13 0 0 -25 58 0 14 34 13.8 0 242 51 -26 1 17 -25 54 42 -26 4 29 -25 51 31 1.97 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 323-209081 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 27 40.2555 DE: -25 27 02.440 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 27 40.2557 DE: -25 27 02.439 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.4 * B mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (8022) Scottcrossfield asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.005 distance from Earth [AU]: 2.20780 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 date of fit: 2023 Apr 25 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): 0.014", 0.002", 78.6° remarks: * orbital elements for (8022)Scottcrossfield : Mean anomaly = 8.8740502767 deg Arg. of pericenter = 268.5741798753 deg Long. of node = 346.5108546097 deg Inclination = 3.4165848525 deg Eccentricity = 0.0039448844 Semimajor axis = 2.2906016851 AU Perihelion dist = 2.2815655263 AU Mag: H = 14.02, G = 0.15 Epoch of elements : MJD 60400.60443921 TDT (2024 Mar 31.6044) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr25,0.38,2024,3,31,14.506547,0.057804,-0.562648,12.820269,1.321437,-0.005379,-0.000872,0.000000,0.000000 -114.7679,-25.4023,-36.60,4.50,False UCAC4 323-209081,19.46118204,-25.4506777,11.73,11.39,11.21,0.0,0,,19.48570858,-25.4022678,7.32,7.05,0,0,0 8022,Scottcrossfield,18.70,8.746,2.2078,0,0,3.769,5.27,,0.8,0 0,8.7022,2024,3,31,268.5742,346.5109,3.4166,0.00394,2.29060,2.28157,14.02,5.0,0.15 1.484,0.0140,0.0023,79,0.0027,Known errors,0.78,0,-1,-1 20240331_209081,60139.27 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org