IOTA/IOTA-ES occultation update for (8174) 1991 SL2 / UCAC4 304-256920 event on 2024 Nov 20, 10:35 UT Visible from Summary ------- On 2024 Nov 20 UT, the 22.622 km diameter asteroid (8174) 1991 SL2 will occult a 11.6 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 6.84 mag to 18.42 mag (the magnitude of the asteroid) for at most 0.640 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: 98 * date and approx. time of event: 2024 Nov 20, 10:32 - 2024 Nov 20, 10:38 * geocentric midpoint of event [JD]: 2460634.94133696 * magnitude of target star: 11.58 * magnitude drop [mag]: 6.84 * estimated maximum duration [s]: 0.640 * Moon: 76 % sunlit, 170° distance * Sun: 50° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.001", 90°) * approx speed of asteroid's shadow [km/s]: 35.1204 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 304-256920 by 8174 1991 SL2 on 2024 Nov 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 - 39 0 0 .. .. .... .. .. .. .. .. .. -33 21 49 .. .. .. -33 28 7 .. .. .. .... - 38 0 0 -33 49 21 10 32 53.8 1 125 39 -33 58 4 -33 40 38 -34 4 22 -33 34 22 .... - 37 0 0 -34 25 23 10 32 54.0 2 125 39 -34 34 6 -34 16 40 -34 40 25 -34 10 24 0.53 - 36 0 0 -35 1 11 10 32 54.1 3 124 40 -35 9 55 -34 52 29 -35 16 13 -34 46 12 0.55 - 35 0 0 -35 36 45 10 32 54.4 4 123 41 -35 45 28 -35 28 2 -35 51 47 -35 21 46 0.56 - 34 0 0 -36 12 2 10 32 54.7 5 123 42 -36 20 46 -36 3 20 -36 27 4 -35 57 4 0.56 - 33 0 0 -36 47 3 10 32 55.0 6 122 42 -36 55 46 -36 38 21 -37 2 4 -36 32 4 0.56 - 32 0 0 -37 21 45 10 32 55.4 7 122 43 -37 30 28 -37 13 3 -37 36 46 -37 6 47 0.56 - 31 0 0 -37 56 8 10 32 55.9 8 121 44 -38 4 50 -37 47 26 -38 11 8 -37 41 11 0.57 - 30 0 0 -38 30 11 10 32 56.4 9 120 45 -38 38 53 -38 21 30 -38 45 10 -38 15 14 0.57 - 29 0 0 -39 3 53 10 32 57.0 10 120 45 -39 12 34 -38 55 12 -39 18 51 -38 48 57 0.57 - 28 0 0 -39 37 13 10 32 57.7 11 119 46 -39 45 53 -39 28 33 -39 52 10 -39 22 18 0.57 - 27 0 0 -40 10 10 10 32 58.3 12 118 46 -40 18 50 -40 1 31 -40 25 6 -39 55 16 0.57 - 26 0 0 -40 42 43 10 32 59.1 13 118 47 -40 51 23 -40 34 5 -40 57 38 -40 27 51 0.57 - 25 0 0 -41 14 53 10 32 59.8 14 117 48 -41 23 31 -41 6 15 -41 29 46 -41 0 2 0.57 - 24 0 0 -41 46 37 10 33 0.7 15 116 48 -41 55 15 -41 38 0 -42 1 29 -41 31 48 0.57 - 23 0 0 -42 17 56 10 33 1.5 15 116 49 -42 26 32 -42 9 20 -42 32 46 -42 3 9 0.57 - 22 0 0 -42 48 49 10 33 2.4 16 115 49 -42 57 24 -42 40 14 -43 3 37 -42 34 3 0.57 - 21 0 0 -43 19 14 10 33 3.4 17 114 50 -43 27 49 -43 10 41 -43 34 1 -43 4 31 0.57 - 20 0 0 -43 49 13 10 33 4.4 18 113 50 -43 57 46 -43 40 41 -44 3 57 -43 34 32 0.57 - 19 0 0 -44 18 44 10 33 5.4 19 113 51 -44 27 16 -44 10 13 -44 33 26 -44 4 5 0.57 - 18 0 0 -44 47 47 10 33 6.5 20 112 51 -44 56 18 -44 39 17 -45 2 27 -44 33 10 0.57 - 17 0 0 -45 16 22 10 33 7.5 21 111 51 -45 24 51 -45 7 53 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35 12 -50 7 8 0.57 - 4 0 0 -50 43 20 10 33 23.8 31 100 55 -50 51 28 -50 35 13 -50 57 20 -50 29 22 0.57 - 3 0 0 -51 5 2 10 33 25.2 31 99 55 -51 13 8 -50 56 57 -51 18 59 -50 51 7 0.57 - 2 0 0 -51 26 15 10 33 26.6 32 98 55 -51 34 19 -51 18 11 -51 40 8 -51 12 23 0.57 - 1 0 0 -51 46 58 10 33 28.0 33 97 55 -51 55 0 -51 38 57 -52 0 49 -51 33 10 0.57 0 0 0 -52 7 13 10 33 29.4 33 96 55 -52 15 13 -51 59 13 -52 21 0 -51 53 27 0.57 1 0 0 -52 26 59 10 33 30.8 34 95 55 -52 34 57 -52 19 1 -52 40 43 -52 13 17 0.57 2 0 0 -52 46 16 10 33 32.2 34 94 55 -52 54 13 -52 38 20 -52 59 57 -52 32 37 0.57 3 0 0 -53 5 5 10 33 33.7 35 93 55 -53 13 0 -52 57 11 -53 18 44 -52 51 29 0.57 4 0 0 -53 23 27 10 33 35.1 36 92 55 -53 31 20 -53 15 34 -53 37 2 -53 9 54 0.57 5 0 0 -53 41 20 10 33 36.5 36 91 55 -53 49 11 -53 33 30 -53 54 52 -53 27 50 0.57 6 0 0 -53 58 46 10 33 38.0 37 90 55 -54 6 35 -53 50 57 -54 12 15 -53 45 19 0.57 7 0 0 -54 15 45 10 33 39.4 38 89 55 -54 23 32 -54 7 58 -54 29 10 -54 2 21 0.57 8 0 0 -54 32 16 10 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27 19 -51 59 49 0.57 108 0 0 -51 53 24 10 36 24.8 55 295 15 -52 1 25 -51 45 23 -52 7 13 -51 39 36 0.57 109 0 0 -51 32 46 10 36 26.9 54 294 14 -51 40 49 -51 24 43 -51 46 38 -51 18 55 0.57 110 0 0 -51 11 38 10 36 29.1 54 292 14 -51 19 43 -51 3 34 -51 25 34 -50 57 44 0.57 111 0 0 -50 50 1 10 36 31.2 53 291 13 -50 58 8 -50 41 55 -51 4 0 -50 36 4 0.57 112 0 0 -50 27 54 10 36 33.4 53 289 12 -50 36 3 -50 19 46 -50 41 57 -50 13 54 0.57 113 0 0 -50 5 18 10 36 35.6 53 288 11 -50 13 29 -49 57 8 -50 19 23 -49 51 15 0.58 114 0 0 -49 42 11 10 36 37.8 52 286 11 -49 50 24 -49 33 59 -49 56 20 -49 28 5 0.58 115 0 0 -49 18 35 10 36 39.9 51 285 10 -49 26 49 -49 10 21 -49 32 46 -49 4 25 0.58 116 0 0 -48 54 28 10 36 42.2 51 283 9 -49 2 44 -48 46 13 -49 8 43 -48 40 16 0.58 117 0 0 -48 29 51 10 36 44.4 50 282 8 -48 38 9 -48 21 34 -48 44 9 -48 15 36 0.58 118 0 0 -48 4 44 10 36 46.6 50 280 8 -48 13 4 -47 56 26 -48 19 5 -47 50 26 0.58 119 0 0 -47 39 7 10 36 48.8 49 279 7 -47 47 29 -47 30 47 -47 53 31 -47 24 46 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37 17.8 40 263 -4 -41 30 18 -41 13 1 -41 36 33 -41 6 48 0.58 133 0 0 -40 49 24 10 37 19.9 39 262 -5 -40 58 4 -40 40 45 -41 4 19 -40 34 31 0.58 134 0 0 -40 16 44 10 37 22.1 38 261 -6 -40 25 24 -40 8 4 -40 31 40 -40 1 49 0.58 135 0 0 -39 43 39 10 37 24.2 37 260 -7 -39 52 20 -39 34 59 -39 58 37 -39 28 44 0.58 136 0 0 -39 10 11 10 37 26.3 37 260 -8 -39 18 53 -39 1 30 -39 25 11 -38 55 15 0.58 137 0 0 -38 36 21 10 37 28.4 36 259 -9 -38 45 3 -38 27 39 -38 51 21 -38 21 23 0.58 138 0 0 -38 2 8 10 37 30.5 35 258 -10 -38 10 52 -37 53 26 -38 17 10 -37 47 10 0.58 139 0 0 -37 27 35 10 37 32.5 34 257 -11 -37 36 19 -37 18 53 -37 42 37 -37 12 36 0.58 140 0 0 -36 52 42 10 37 34.5 33 256 -12 -37 1 26 -36 43 59 -37 7 45 -36 37 43 0.59 141 0 0 -36 17 31 10 37 36.5 32 255 -13 -36 26 15 -36 8 48 -36 32 34 -36 2 31 0.59 142 0 0 -35 42 1 10 37 38.4 31 254 -14 -35 50 46 -35 33 18 -35 57 5 -35 27 1 0.59 143 0 0 -35 6 15 10 37 40.3 30 254 -15 -35 15 0 -34 57 32 -35 21 19 -34 51 15 0.59 144 0 0 -34 30 14 10 37 42.2 29 253 -16 -34 38 58 -34 21 30 -34 45 17 -34 15 13 0.59 145 0 0 -33 53 58 10 37 44.0 28 252 -17 -34 2 42 -33 45 15 -34 9 1 -33 38 58 0.59 146 0 0 -33 17 29 10 37 45.7 27 251 -18 -33 26 13 -33 8 46 -33 32 32 -33 2 29 0.59 147 0 0 -32 40 48 10 37 47.5 26 251 -19 -32 49 32 -32 32 5 -32 55 51 -32 25 49 0.59 148 0 0 -32 3 57 10 37 49.1 25 250 -20 -32 12 41 -31 55 14 -32 18 59 -31 48 58 0.59 149 0 0 -31 26 56 10 37 50.7 24 249 -21 -31 35 39 -31 18 14 -31 41 58 -31 11 58 0.59 150 0 0 -30 49 48 10 37 52.3 23 249 -22 -30 58 30 -30 41 6 -31 4 48 -30 34 50 0.59 151 0 0 -30 12 33 10 37 53.8 22 248 -23 -30 21 15 -30 3 52 -30 27 32 -29 57 36 0.60 152 0 0 -29 35 12 10 37 55.3 21 247 -24 -29 43 54 -29 26 32 -29 50 10 -29 20 17 0.60 153 0 0 -28 57 48 10 37 56.7 20 247 -25 -29 6 29 -28 49 9 -29 12 45 -28 42 54 0.60 154 0 0 -28 20 21 10 37 58.0 19 246 -27 -28 29 1 -28 11 43 -28 35 17 -28 5 29 0.60 155 0 0 -27 42 54 10 37 59.2 18 246 -28 -27 51 32 -27 34 16 -27 57 47 -27 28 3 0.60 156 0 0 -27 5 26 10 38 0.4 17 245 -29 -27 14 4 -26 56 49 -27 20 18 -26 50 37 0.60 157 0 0 -26 28 0 10 38 1.6 16 245 -30 -26 36 37 -26 19 25 -26 42 50 -26 13 13 0.61 158 0 0 -25 50 37 10 38 2.6 15 244 -31 -25 59 13 -25 42 3 -26 5 25 -25 35 52 0.61 159 0 0 -25 13 19 10 38 3.6 14 244 -32 -25 21 53 -25 4 45 -25 28 5 -24 58 36 0.61 160 0 0 -24 36 6 10 38 4.5 13 243 -33 -24 44 39 -24 27 34 -24 50 50 -24 21 25 0.61 161 0 0 -23 59 1 10 38 5.4 12 243 -34 -24 7 32 -23 50 30 -24 13 42 -23 44 22 0.62 162 0 0 -23 22 4 10 38 6.2 10 242 -35 -23 30 34 -23 13 34 -23 36 43 -23 7 27 0.62 163 0 0 -22 45 16 10 38 6.8 9 242 -36 -22 53 45 -22 36 48 -22 59 53 -22 30 42 0.63 164 0 0 -22 8 40 10 38 7.5 8 242 -37 -22 17 7 -22 0 14 -22 23 14 -21 54 8 0.64 165 0 0 -21 32 16 10 38 8.0 7 241 -38 -21 40 42 -21 23 51 -21 46 48 -21 17 47 0.65 166 0 0 -20 56 6 10 38 8.5 6 241 -39 -21 4 30 -20 47 42 -21 10 34 -20 41 39 0.66 167 0 0 -20 20 10 10 38 8.9 5 241 -40 -20 28 33 -20 11 48 -20 34 36 -20 5 47 0.68 168 0 0 -19 44 31 10 38 9.2 4 240 -41 -19 52 52 -19 36 10 -19 58 54 -19 30 10 0.71 169 0 0 -19 9 8 10 38 9.4 3 240 -42 -19 17 27 -19 0 49 -19 23 28 -18 54 50 0.77 170 0 0 -18 34 3 10 38 9.6 2 240 -43 -18 42 21 -18 25 47 -18 48 21 -18 19 48 0.91 171 0 0 -17 59 18 10 38 9.6 0 239 -45 -18 7 34 -17 51 3 -18 13 33 -17 45 6 1.75 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 304-256920 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 20 48.9083 DE: -29 20 32.245 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 20 48.9083 DE: -29 20 32.245 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.6 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (8174) 1991 SL2 asteroid class: approx. diameter [km]: 23 approx. diameter ["]: 0.008 distance from Earth [AU]: 3.74640 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 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): 0.017", 0.001", 90.319° remarks: * orbital elements for (8174)1991 SL2 : Mean anomaly = 275.2227598770 deg Arg. of pericenter = 335.3630728366 deg Long. of node = 67.6081776782 deg Inclination = 10.3302202440 deg Eccentricity = 0.1430671591 Semimajor axis = 3.1752571371 AU Perihelion dist = 2.7209821190 AU Mag: H = 12.25, G = 0.15 Epoch of elements : MJD 60634.44133662 TDT (2024 Nov 20.4413) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr25,0.64,2024,11,20,10.592087,0.077741,-0.486349,19.569438,3.159898,0.004577,0.000164,-0.000001,0.000000 71.7730,-29.2974,17.55,-19.85,False UCAC4 304-256920,19.34691903,-29.3422903,12.24,11.58,11.22,0.0,0,,19.37274607,-29.2974220,6.84,6.75,0,0,0 8174,1991 SL2,18.42,22.622,3.7464,0,0,3.512,7.42,,2.0,0 0,275.1459,2024,11,20,335.3631,67.6082,10.3302,0.14307,3.17526,2.72098,12.24,5.0,0.15 1.361,0.0173,0.0010,90,0.0030,Known errors,1.05,0,-1,-1 20241120_256920,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org