IOTA/IOTA-ES occultation update for (31822) 1999 SY4 / UCAC4 337-199447 event on 2024 Nov 18, 19:16 UT Visible from Summary ------- On 2024 Nov 18 UT, the 22.998 km diameter asteroid (31822) 1999 SY4 will occult a 11.5 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.09 mag to 18.57 mag (the magnitude of the asteroid) for at most 0.920 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 Nov 18, 19:13 - 2024 Nov 18, 19:20 * geocentric midpoint of event [JD]: 2460633.30332216 * magnitude of target star: 11.48 * magnitude drop [mag]: 7.09 * estimated maximum duration [s]: 0.920 * Moon: 88 % sunlit, 147° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.001", 72°) * approx speed of asteroid's shadow [km/s]: 25.0499 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 337-199447 by 31822 1999 SY4 on 2024 Nov 18 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 -153 0 0 -51 59 10 19 13 17.6 1 128 44 -52 8 47 -51 49 33 -52 13 20 -51 45 2 .... -152 0 0 -52 27 57 19 13 17.6 1 127 45 -52 37 32 -52 18 23 -52 42 5 -52 13 52 0.65 -151 0 0 -52 56 10 19 13 17.8 2 126 45 -53 5 43 -52 46 38 -53 10 14 -52 42 8 0.67 -150 0 0 -53 23 48 19 13 18.0 3 125 45 -53 33 20 -53 14 19 -53 37 50 -53 9 50 0.67 -149 0 0 -53 50 53 19 13 18.2 4 124 45 -54 0 22 -53 41 25 -54 4 51 -53 36 57 0.68 -148 0 0 -54 17 23 19 13 18.5 4 124 46 -54 26 50 -54 7 58 -54 31 18 -54 3 31 0.68 -147 0 0 -54 43 19 19 13 18.8 5 123 46 -54 52 43 -54 33 56 -54 57 10 -54 29 30 0.68 -146 0 0 -55 8 41 19 13 19.2 6 122 46 -55 18 3 -54 59 20 -55 22 29 -54 54 56 0.69 -145 0 0 -55 33 29 19 13 19.6 6 121 46 -55 42 48 -55 24 10 -55 47 13 -55 19 47 0.69 -144 0 0 -55 57 43 19 13 20.0 7 120 46 -56 7 0 -55 48 27 -56 11 23 -55 44 5 0.69 -143 0 0 -56 21 23 19 13 20.5 8 119 46 -56 30 38 -56 12 10 -56 35 0 -56 7 49 0.69 -142 0 0 -56 44 31 19 13 21.0 8 119 47 -56 53 43 -56 35 20 -56 58 4 -56 31 0 0.69 -141 0 0 -57 7 5 19 13 21.6 9 118 47 -57 16 14 -56 57 57 -57 20 34 -56 53 38 0.69 -140 0 0 -57 29 6 19 13 22.2 10 117 47 -57 38 13 -57 20 1 -57 42 32 -57 15 44 0.69 -139 0 0 -57 50 36 19 13 22.8 10 116 47 -57 59 40 -57 41 33 -58 3 57 -57 37 17 0.69 -138 0 0 -58 11 33 19 13 23.5 11 115 47 -58 20 34 -58 2 32 -58 24 50 -57 58 18 0.69 -137 0 0 -58 31 58 19 13 24.1 12 114 47 -58 40 57 -58 23 0 -58 45 12 -58 18 47 0.69 -136 0 0 -58 51 52 19 13 24.8 12 113 47 -59 0 48 -58 42 57 -59 5 2 -58 38 45 0.69 -135 0 0 -59 11 15 19 13 25.6 13 113 47 -59 20 9 -59 2 23 -59 24 22 -58 58 12 0.69 -134 0 0 -59 30 8 19 13 26.3 14 112 47 -59 38 59 -59 21 18 -59 43 10 -59 17 8 0.69 -133 0 0 -59 48 31 19 13 27.1 14 111 47 -59 57 19 -59 39 43 -60 1 29 -59 35 35 0.69 -132 0 0 -60 6 24 19 13 27.9 15 110 47 -60 15 9 -59 57 39 -60 19 18 -59 53 31 0.69 -131 0 0 -60 23 47 19 13 28.7 15 109 47 -60 32 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0 0 -20 49 35 19 19 53.8 22 253 -42 -20 58 41 -20 40 29 -21 3 0 -20 36 12 0.72 41 0 0 -20 12 35 19 19 56.0 21 253 -43 -20 21 39 -20 3 32 -20 25 56 -19 59 16 0.72 42 0 0 -19 36 4 19 19 58.1 20 252 -44 -19 45 5 -19 27 3 -19 49 21 -19 22 49 0.72 43 0 0 -19 0 1 19 20 0.2 19 252 -45 -19 9 0 -18 51 4 -19 13 15 -18 46 50 0.72 44 0 0 -18 24 30 19 20 2.1 18 251 -46 -18 33 26 -18 15 35 -18 37 39 -18 11 22 0.73 45 0 0 -17 49 29 19 20 3.9 17 251 -47 -17 58 22 -17 40 37 -18 2 35 -17 36 26 0.73 46 0 0 -17 15 1 19 20 5.6 16 251 -48 -17 23 51 -17 6 11 -17 28 2 -17 2 1 0.73 47 0 0 -16 41 5 19 20 7.2 15 250 -49 -16 49 53 -16 32 18 -16 54 3 -16 28 10 0.73 48 0 0 -16 7 43 19 20 8.6 13 250 -50 -16 16 29 -15 58 59 -16 20 37 -15 54 52 0.74 49 0 0 -15 34 56 19 20 10.0 12 250 -51 -15 43 39 -15 26 14 -15 47 46 -15 22 8 0.74 50 0 0 -15 2 44 19 20 11.2 11 249 -52 -15 11 24 -14 54 5 -15 15 30 -14 50 0 0.74 51 0 0 -14 31 7 19 20 12.3 10 249 -53 -14 39 45 -14 22 31 -14 43 50 -14 18 27 0.75 52 0 0 -14 0 7 19 20 13.3 9 249 -54 -14 8 42 -13 51 33 -14 12 46 -13 47 30 0.76 53 0 0 -13 29 44 19 20 14.2 8 249 -55 -13 38 17 -13 21 12 -13 42 19 -13 17 11 0.76 54 0 0 -12 59 58 19 20 15.0 7 248 -55 -13 8 28 -12 51 29 -13 12 30 -12 47 28 0.77 55 0 0 -12 30 50 19 20 15.6 6 248 -56 -12 39 17 -12 22 23 -12 43 18 -12 18 24 0.79 56 0 0 -12 2 20 19 20 16.2 5 248 -57 -12 10 45 -11 53 55 -12 14 44 -11 49 57 0.81 57 0 0 -11 34 28 19 20 16.6 4 248 -58 -11 42 51 -11 26 6 -11 46 49 -11 22 9 0.84 58 0 0 -11 7 16 19 20 16.9 3 247 -58 -11 15 37 -10 58 56 -11 19 33 -10 55 0 0.90 59 0 0 -10 40 42 19 20 17.1 2 247 -59 -10 49 1 -10 32 25 -10 52 57 -10 28 30 1.04 60 0 0 -10 14 48 19 20 17.2 0 247 -60 -10 23 5 -10 6 33 -10 27 0 -10 2 39 1.86 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 337-199447 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 56 57.5068 DE: -22 44 46.826 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 56 57.5068 DE: -22 44 46.826 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.5 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (31822) 1999 SY4 asteroid class: approx. diameter [km]: 23 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.40350 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 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): 0.021", 0.001", 72.092° remarks: * orbital elements for (31822)1999 SY4 : Mean anomaly = 344.2725798390 deg Arg. of pericenter = 317.6810586813 deg Long. of node = 26.5562668336 deg Inclination = 6.3824514688 deg Eccentricity = 0.0444347403 Semimajor axis = 3.4126303055 AU Perihelion dist = 3.2609909641 AU Mag: H = 12.44, G = 0.15 Epoch of elements : MJD 60632.80332188 TDT (2024 Nov 18.8033) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr25,0.92,2024,11,18,19.279732,0.225054,-0.517655,12.964037,5.642805,0.005548,0.001459,0.000000,0.000000 -32.9200,-22.6523,-112.86,-19.48,False UCAC4 337-199447,20.94930748,-22.7463404,12.04,11.48,11.18,0.0,0,,20.97321692,-22.6522531,7.09,6.94,0,0,0 31822,1999 SY4,18.57,22.998,3.4035,0,0,2.420,14.58,,1.8,0 0,344.1470,2024,11,18,317.6811,26.5563,6.3825,0.04443,3.41263,3.26099,12.44,5.0,0.15 1.236,0.0213,0.0007,72,0.0022,Known errors,1.55,0,-1,-1 20241118_199447,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org