IOTA/IOTA-ES occultation update for (4209) Briggs / UCAC4 258-103839 event on 2024 Oct 21, 00:14 UT Visible from Summary ------- On 2024 Oct 21 UT, the 29.101537203052 km diameter asteroid (4209) Briggs will occult a 12.0 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.53 mag to 17.47 mag (the magnitude of the asteroid) for at most 0.770 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 21, 00:12 - 2024 Oct 21, 00:17 * geocentric midpoint of event [JD]: 2460604.51028292 * magnitude of target star: 11.95 * magnitude drop [mag]: 5.53 * estimated maximum duration [s]: 0.770 * Moon: 82 % sunlit, 169° distance * Sun: 49° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 93°) * approx speed of asteroid's shadow [km/s]: 37.9769 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 258-103839 by 4209 Briggs on 2024 Oct 21 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 104 0 0 .. .. .... .. .. .. .. .. .. -27 16 7 .. .. .. -27 22 35 .. .. .. .... 105 0 0 -27 55 43 0 12 25.1 1 134 24 -28 8 54 -27 42 35 -28 15 24 -27 36 9 .... 106 0 0 -28 48 33 0 12 25.2 2 133 25 -29 1 47 -28 35 21 -29 8 19 -28 28 52 0.56 107 0 0 -29 41 27 0 12 25.5 4 133 26 -29 54 45 -29 28 11 -30 1 19 -29 21 41 0.58 108 0 0 -30 34 23 0 12 25.8 5 132 27 -30 47 45 -30 21 4 -30 54 20 -30 14 32 0.59 109 0 0 -31 27 18 0 12 26.2 6 132 28 -31 40 43 -31 13 55 -31 47 20 -31 7 21 0.59 110 0 0 -32 20 8 0 12 26.7 7 131 28 -32 33 37 -32 6 43 -32 40 15 -32 0 7 0.60 111 0 0 -33 12 52 0 12 27.3 8 131 29 -33 26 23 -32 59 23 -33 33 3 -32 52 46 0.60 112 0 0 -34 5 26 0 12 27.9 10 130 30 -34 19 0 -33 51 54 -34 25 41 -33 45 16 0.60 113 0 0 -34 57 47 0 12 28.7 11 130 31 -35 11 23 -34 44 13 -35 18 6 -34 37 34 0.60 114 0 0 -35 49 52 0 12 29.5 12 129 31 -36 3 31 -35 36 16 -36 10 15 -35 29 36 0.61 115 0 0 -36 41 39 0 12 30.4 13 128 32 -36 55 20 -36 28 1 -37 2 5 -36 21 20 0.61 116 0 0 -37 33 5 0 12 31.4 14 128 33 -37 46 47 -37 19 26 -37 53 33 -37 12 43 0.61 117 0 0 -38 24 7 0 12 32.4 16 127 33 -38 37 51 -38 10 26 -38 44 37 -38 3 43 0.61 118 0 0 -39 14 42 0 12 33.5 17 126 34 -39 28 27 -39 1 0 -39 35 14 -38 54 17 0.61 119 0 0 -40 4 49 0 12 34.7 18 126 34 -40 18 34 -39 51 6 -40 25 22 -39 44 22 0.61 120 0 0 -40 54 23 0 12 35.9 19 125 35 -41 8 10 -40 40 40 -41 14 57 -40 33 56 0.61 121 0 0 -41 43 24 0 12 37.2 20 124 35 -41 57 11 -41 29 41 -42 3 58 -41 22 57 0.61 122 0 0 -42 31 49 0 12 38.5 21 123 36 -42 45 35 -42 18 6 -42 52 23 -42 11 22 0.61 123 0 0 -43 19 36 0 12 39.9 22 123 36 -43 33 22 -43 5 53 -43 40 9 -42 59 9 0.61 124 0 0 -44 6 43 0 12 41.3 23 122 36 -44 20 28 -43 53 1 -44 27 15 -43 46 17 0.61 125 0 0 -44 53 8 0 12 42.8 24 121 37 -45 6 51 -44 39 27 -45 13 38 -44 32 44 0.61 126 0 0 -45 38 49 0 12 44.3 25 120 37 -45 52 31 -45 25 9 -45 59 17 -45 18 27 0.61 127 0 0 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17 3.7 17 235 -32 -32 51 42 -32 24 44 -32 58 22 -32 18 8 0.65 - 48 0 0 -31 45 15 0 17 4.9 15 234 -33 -31 58 42 -31 31 50 -32 5 20 -31 25 15 0.65 - 47 0 0 -30 52 13 0 17 6.0 14 233 -34 -31 5 37 -30 38 51 -31 12 13 -30 32 18 0.66 - 46 0 0 -29 59 8 0 17 7.0 13 233 -35 -30 12 29 -29 45 50 -30 19 4 -29 39 19 0.66 - 45 0 0 -29 6 4 0 17 7.9 12 232 -37 -29 19 21 -28 52 50 -29 25 54 -28 46 21 0.67 - 44 0 0 -28 13 4 0 17 8.7 11 232 -38 -28 26 17 -27 59 54 -28 32 48 -27 53 26 0.67 - 43 0 0 -27 20 10 0 17 9.5 9 231 -39 -27 33 19 -27 7 4 -27 39 48 -27 0 38 0.68 - 42 0 0 -26 27 26 0 17 10.1 8 231 -40 -26 40 30 -26 14 24 -26 46 57 -26 8 0 0.69 - 41 0 0 -25 34 53 0 17 10.7 7 230 -42 -25 47 53 -25 21 55 -25 54 18 -25 15 34 0.71 - 40 0 0 -24 42 35 0 17 11.2 6 230 -43 -24 55 30 -24 29 42 -25 1 53 -24 23 22 0.73 - 39 0 0 -23 50 34 0 17 11.6 4 230 -44 -24 3 25 -23 37 45 -24 9 45 -23 31 28 0.76 - 38 0 0 -22 58 52 0 17 11.8 3 229 -45 -23 11 38 -22 46 8 -23 17 56 -22 39 53 0.82 - 37 0 0 -22 7 33 0 17 12.0 2 229 -47 -22 20 14 -21 54 53 -22 26 30 -21 48 41 0.96 - 36 0 0 -21 16 37 0 17 12.1 1 228 -48 -21 29 14 -21 4 3 -21 35 27 -20 57 53 1.76 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 258-103839 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 42 37.4102 DE: -38 30 17.370 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 42 37.4102 DE: -38 30 17.370 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.0 * B mag [mag]: 12.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4209) Briggs asteroid class: approx. diameter [km]: 29 approx. diameter ["]: 0.011 distance from Earth [AU]: 3.64640 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): 0.017", 0.002", 92.968° remarks: * orbital elements for (4209)Briggs : Mean anomaly = 291.9733519389 deg Arg. of pericenter = 13.8273050020 deg Long. of node = 330.1445693888 deg Inclination = 21.6022792981 deg Eccentricity = 0.0811274173 Semimajor axis = 3.1585106193 AU Perihelion dist = 2.9022688101 AU Mag: H = 11.43, G = 0.15 Epoch of elements : MJD 60604.01028279 TDT (2024 Oct 21.0103) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.77,2024,10,21,0.246790,0.037507,-0.516666,21.376827,1.581183,0.004081,-0.001677,-0.000001,0.000000 -142.5735,-38.5530,172.45,-10.80,False UCAC4 258-103839,16.71039179,-38.5048253,12.91,11.95,11.43,0.1,0,,16.73804427,-38.5530065,5.53,5.60,0,0,0 4209,Briggs,17.47,29.366,3.6464,0,0,4.396,3.82,,1.8,0 0,291.7960,2024,10,20,13.8273,330.1446,21.6023,0.08113,3.15851,2.90227,11.42,5.0,0.15 1.246,0.0170,0.0017,93,0.0027,Known errors,1.17,0,-1,-1 20241021_103839,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org