IOTA/IOTA-ES occultation update for (8030) Williamknight / TYC 5540-01428-1 event on 2024 Jul 20, 11:38 UT Visible from Summary ------- On 2024 Jul 20 UT, the 21.0915445451943 km diameter asteroid (8030) Williamknight will occult a 10.5 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.74 mag to 18.24 mag (the magnitude of the asteroid) for at most 1.120 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: 97 * date and approx. time of event: 2024 Jul 20, 11:32 - 2024 Jul 20, 11:44 * geocentric midpoint of event [JD]: 2460511.98497005 * magnitude of target star: 10.50 * magnitude drop [mag]: 7.74 * estimated maximum duration [s]: 1.120 * Moon: 99 % sunlit, 85° distance * Sun: 82° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 121°) * approx speed of asteroid's shadow [km/s]: 19.0116 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5540-01428-1 by 8030 Williamknight on 2024 Jul 20 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 2 0 0 26 57 13 11 32 46.7 1 103 81 26 51 17 27 3 9 26 46 41 27 7 45 .... 3 0 0 26 44 55 11 32 46.8 1 103 82 26 38 59 26 50 52 26 34 23 26 55 28 0.01 4 0 0 26 32 13 11 32 46.9 2 104 83 26 26 16 26 38 10 26 21 40 26 42 47 -0.02 5 0 0 26 19 7 11 32 47.2 3 104 83 26 13 9 26 25 4 26 8 32 26 29 42 -0.03 6 0 0 26 5 36 11 32 47.6 4 104 84 25 59 37 26 11 34 25 55 0 26 16 11 -0.04 7 0 0 25 51 40 11 32 48.0 5 105 84 25 45 41 25 57 39 25 41 3 26 2 17 -0.04 8 0 0 25 37 20 11 32 48.5 6 105 85 25 31 20 25 43 19 25 26 42 25 47 58 -0.04 9 0 0 25 22 35 11 32 49.2 7 106 85 25 16 35 25 28 35 25 11 56 25 33 14 -0.05 10 0 0 25 7 25 11 32 49.9 8 106 85 25 1 25 25 13 26 24 56 45 25 18 6 -0.05 11 0 0 24 51 52 11 32 50.7 9 107 85 24 45 50 24 57 53 24 41 10 25 2 33 -0.05 12 0 0 24 35 53 11 32 51.6 10 107 84 24 29 51 24 41 56 24 25 11 24 46 36 -0.05 13 0 0 24 19 31 11 32 52.6 11 107 84 24 13 28 24 25 34 24 8 47 24 30 15 -0.05 14 0 0 24 2 44 11 32 53.7 12 108 84 23 56 40 24 8 47 23 51 59 24 13 29 -0.05 15 0 0 23 45 32 11 32 54.9 13 108 83 23 39 28 23 51 37 23 34 46 23 56 19 -0.05 16 0 0 23 27 57 11 32 56.2 14 109 82 23 21 52 23 34 2 23 17 9 23 38 44 -0.05 17 0 0 23 9 57 11 32 57.6 15 109 81 23 3 52 23 16 3 22 59 8 23 20 46 -0.05 18 0 0 22 51 33 11 32 59.1 16 109 81 22 45 27 22 57 40 22 40 43 23 2 24 -0.05 19 0 0 22 32 46 11 33 0.7 17 110 80 22 26 39 22 38 53 22 21 54 22 43 37 -0.05 20 0 0 22 13 34 11 33 2.4 18 110 79 22 7 26 22 19 42 22 2 42 22 24 27 -0.05 21 0 0 21 53 59 11 33 4.2 19 111 78 21 47 51 22 0 8 21 43 5 22 4 53 -0.05 22 0 0 21 34 0 11 33 6.1 20 111 77 21 27 51 21 40 10 21 23 5 21 44 56 -0.05 23 0 0 21 13 38 11 33 8.1 21 111 76 21 7 28 21 19 48 21 2 42 21 24 35 -0.05 24 0 0 20 52 53 11 33 10.2 22 112 75 20 46 42 20 59 4 20 41 55 21 3 51 -0.06 25 0 0 20 31 45 11 33 12.5 23 112 74 20 25 33 20 37 56 20 20 46 20 42 44 -0.06 26 0 0 20 10 14 11 33 14.8 24 112 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54 -21 16 15 -0.07 163 0 0 -21 20 51 11 43 46.9 13 263 -69 -21 26 40 -21 15 1 -21 31 11 -21 10 31 -0.07 164 0 0 -21 14 41 11 43 48.1 12 263 -70 -21 20 30 -21 8 51 -21 25 1 -21 4 20 -0.07 165 0 0 -21 8 5 11 43 49.2 11 262 -71 -21 13 55 -21 2 15 -21 18 26 -20 57 44 -0.07 166 0 0 -21 1 4 11 43 50.2 10 262 -72 -21 6 54 -20 55 13 -21 11 25 -20 50 42 -0.07 167 0 0 -20 53 37 11 43 51.2 9 262 -72 -20 59 27 -20 47 46 -21 3 59 -20 43 14 -0.06 168 0 0 -20 45 44 11 43 52.1 8 261 -73 -20 51 35 -20 39 53 -20 56 7 -20 35 21 -0.06 169 0 0 -20 37 25 11 43 52.8 7 261 -74 -20 43 17 -20 31 34 -20 47 49 -20 27 2 -0.06 170 0 0 -20 28 42 11 43 53.5 7 261 -75 -20 34 33 -20 22 50 -20 39 6 -20 18 17 -0.06 171 0 0 -20 19 32 11 43 54.1 6 260 -76 -20 25 24 -20 13 40 -20 29 57 -20 9 7 -0.06 172 0 0 -20 9 57 11 43 54.6 5 260 -77 -20 15 50 -20 4 4 -20 20 23 -19 59 31 -0.06 173 0 0 -19 59 57 11 43 55.0 4 260 -78 -20 5 50 -19 54 3 -20 10 23 -19 49 30 -0.06 174 0 0 -19 49 31 11 43 55.3 3 259 -79 -19 55 24 -19 43 37 -19 59 58 -19 39 3 -0.05 175 0 0 -19 38 40 11 43 55.5 2 259 -80 -19 44 34 -19 32 45 -19 49 8 -19 28 11 -0.04 176 0 0 -19 27 23 11 43 55.7 1 259 -81 -19 33 18 -19 21 29 -19 37 52 -19 16 54 -0.02 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 5540-01428-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 09 14.2294 DE: -10 56 02.734 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 09 14.2292 DE: -10 56 02.733 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.5 * B mag [mag]: 11.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (8030) Williamknight asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.30160 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 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): 0.020", 0.002", 120.853° remarks: * orbital elements for (8030)Williamknight : Mean anomaly = 249.6905503686 deg Arg. of pericenter = 324.4974436021 deg Long. of node = 10.7078330120 deg Inclination = 7.2045488676 deg Eccentricity = 0.0662630070 Semimajor axis = 3.2340267263 AU Perihelion dist = 3.0197303906 AU Mag: H = 12.12, G = 0.15 Epoch of elements : MJD 60511.48497029 TDT (2024 Jul 20.4850) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,1.12,2024,7,20,11.639281,0.028269,0.062899,9.839569,-4.281378,0.005147,-0.002158,0.000000,0.000000 84.2955,-11.0650,7.02,20.51,False TYC 5540-01428-1,13.15395264,-10.9340930,10.98,10.50,10.24,0.1,0,,13.17533489,-11.0649800,7.74,7.55,0,0,0 8030,Williamknight,18.24,21.331,3.3016,0,0,1.781,-11.41,,1.8,0 0,249.6084,2024,7,20,324.4974,10.7078,7.2045,0.06626,3.23403,3.01973,12.12,5.0,0.15 1.387,0.0203,0.0023,121,0.0034,Known errors,1.03,0,-1,-1 20240720_1428-1,60140.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org