IOTA/IOTA-ES occultation update for (8022) Scottcrossfield / UCAC4 320-218422 event on 2024 Aug 01, 09:21 UT Visible from Summary ------- On 2024 Aug 01 UT, the 8.66281631523785 km diameter asteroid (8022) Scottcrossfield 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 5.14 mag to 16.95 mag (the magnitude of the asteroid) for at most 1.040 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: 87 * date and approx. time of event: 2024 Aug 01, 09:09 - 2024 Aug 01, 09:34 * geocentric midpoint of event [JD]: 2460523.89021850 * magnitude of target star: 11.82 * magnitude drop [mag]: 5.14 * estimated maximum duration [s]: 1.040 * Moon: 10 % sunlit, 162° distance * Sun: 162° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 9 * 1 sigma uncertainty interval [path widths]: +/- 0.58 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.003", 79°) * approx speed of asteroid's shadow [km/s]: 8.4198 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 320-218422 by 8022 Scottcrossfield on 2024 Aug 1 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 119 0 0 15 9 56 9 33 55.7 1 117 13 15 12 46 15 7 7 15 16 2 15 3 50 .... 120 0 0 14 40 15 9 33 55.3 2 118 12 14 43 4 14 37 25 14 46 20 14 34 9 -0.18 121 0 0 14 10 39 9 33 54.6 3 118 11 14 13 28 14 7 50 14 16 44 14 4 34 -0.24 122 0 0 13 41 9 9 33 53.6 4 118 10 13 43 58 13 38 20 13 47 14 13 35 5 -0.26 123 0 0 13 11 47 9 33 52.4 5 118 9 13 14 35 13 8 58 13 17 51 13 5 43 -0.28 124 0 0 12 42 32 9 33 50.9 6 119 8 12 45 21 12 39 44 12 48 36 12 36 29 -0.29 125 0 0 12 13 27 9 33 49.1 7 119 7 12 16 15 12 10 39 12 19 30 12 7 24 -0.30 126 0 0 11 44 31 9 33 47.0 9 119 6 11 47 19 11 41 43 11 50 34 11 38 29 -0.31 127 0 0 11 15 45 9 33 44.6 10 119 4 11 18 33 11 12 58 11 21 48 11 9 43 -0.31 128 0 0 10 47 11 9 33 41.9 11 119 3 10 49 58 10 44 23 10 53 12 10 41 9 -0.31 129 0 0 10 18 48 9 33 39.0 12 120 2 10 21 35 10 16 1 10 24 49 10 12 47 -0.32 130 0 0 9 50 37 9 33 35.8 13 120 1 9 53 24 9 47 50 9 56 37 9 44 37 -0.32 131 0 0 9 22 40 9 33 32.4 14 120 0 9 25 26 9 19 53 9 28 39 9 16 40 -0.32 132 0 0 8 54 56 9 33 28.6 15 120 -1 8 57 42 8 52 10 9 0 55 8 48 57 -0.32 133 0 0 8 27 26 9 33 24.6 16 120 -2 8 30 12 8 24 41 8 33 25 8 21 28 -0.32 134 0 0 8 0 12 9 33 20.4 17 120 -3 8 2 58 7 57 27 8 6 10 7 54 15 -0.33 135 0 0 7 33 13 9 33 15.9 18 121 -4 7 35 59 7 30 28 7 39 10 7 27 16 -0.33 136 0 0 7 6 31 9 33 11.1 19 121 -5 7 9 16 7 3 46 7 12 27 7 0 34 -0.33 137 0 0 6 40 5 9 33 6.1 20 121 -6 6 42 49 6 37 20 6 46 0 6 34 9 -0.33 138 0 0 6 13 56 9 33 0.8 21 121 -7 6 16 40 6 11 12 6 19 51 6 8 1 -0.33 139 0 0 5 48 5 9 32 55.3 22 121 -8 5 50 49 5 45 21 5 53 59 5 42 11 -0.33 140 0 0 5 22 32 9 32 49.6 24 121 -9 5 25 16 5 19 49 5 28 26 5 16 39 -0.33 141 0 0 4 57 18 9 32 43.6 25 122 -10 5 0 1 4 54 35 5 3 11 4 51 26 -0.33 142 0 0 4 32 23 9 32 37.4 26 122 -11 4 35 6 4 29 40 4 38 15 4 26 31 -0.33 143 0 0 4 7 48 9 32 31.0 27 122 -13 4 10 30 4 5 5 4 13 39 4 1 57 -0.33 144 0 0 3 43 33 9 32 24.3 28 122 -14 3 46 15 3 40 50 3 49 23 3 37 42 -0.33 145 0 0 3 19 38 9 32 17.4 29 122 -15 3 22 20 3 16 56 3 25 27 3 13 48 -0.33 146 0 0 2 56 4 9 32 10.3 30 122 -16 2 58 45 2 53 22 3 1 53 2 50 15 -0.33 147 0 0 2 32 51 9 32 3.1 31 123 -17 2 35 32 2 30 10 2 38 39 2 27 3 -0.33 148 0 0 2 9 59 9 31 55.6 32 123 -18 2 12 40 2 7 18 2 15 47 2 4 12 -0.33 149 0 0 1 47 30 9 31 47.9 33 123 -19 1 50 10 1 44 49 1 53 16 1 41 43 -0.33 150 0 0 1 25 22 9 31 40.0 34 123 -20 1 28 2 1 22 42 1 31 8 1 19 36 -0.33 151 0 0 1 3 37 9 31 31.9 35 123 -21 1 6 17 1 0 57 1 9 22 0 57 52 -0.33 152 0 0 0 42 14 9 31 23.7 36 123 -22 0 44 54 0 39 35 0 47 59 0 36 30 -0.33 153 0 0 0 21 15 9 31 15.2 37 124 -23 0 23 54 0 18 36 0 26 59 0 15 31 -0.33 154 0 0 0 0 39 9 31 6.6 38 124 -24 0 3 17 - 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Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 320-218422 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 35 25.8585 DE: -26 06 35.071 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 35 25.8585 DE: -26 06 35.071 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (8022) Scottcrossfield asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.009 distance from Earth [AU]: 1.29860 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): 0.025", 0.003", 78.772° remarks: * orbital elements for (8022)Scottcrossfield : Mean anomaly = 44.7534495984 deg Arg. of pericenter = 267.6071863975 deg Long. of node = 346.5061823572 deg Inclination = 3.4167067667 deg Eccentricity = 0.0038713421 Semimajor axis = 2.2903812248 AU Perihelion dist = 2.2815143755 AU Mag: H = 14.02, G = 0.15 Epoch of elements : MJD 60523.39021912 TDT (2024 Aug 01.3902) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr25,1.04,2024,8,1,9.365244,-0.002784,0.306413,-4.752184,-0.042821,0.001545,0.000653,0.000001,0.000000 -156.7186,-26.0555,41.11,17.84,False UCAC4 320-218422,19.59051626,-26.1097418,12.72,11.82,11.33,0.1,0,,19.61598604,-26.0555288,5.14,5.17,0,0,0 8022,Scottcrossfield,16.95,8.757,1.2986,0,0,-2.387,-0.29,,0.8,0 0,44.6425,2024,8,1,267.6072,346.5062,3.4167,0.00387,2.29038,2.28151,14.02,5.0,0.15 1.580,0.0250,0.0027,79,0.0054,Known errors,0.97,0,-1,-1 20240801_218422,60140.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org