IOTA/IOTA-ES occultation update for (38573) 1999 WA1 / TYC 7427-00120-1 event on 2024 Oct 14, 09:13 UT Visible from Summary ------- On 2024 Oct 14 UT, the 14.7386516774638 km diameter asteroid (38573) 1999 WA1 will occult a 9.1 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 9.44 mag to 18.53 mag (the magnitude of the asteroid) for at most 0.860 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: 76 * date and approx. time of event: 2024 Oct 14, 09:07 - 2024 Oct 14, 09:19 * geocentric midpoint of event [JD]: 2460597.88462304 * magnitude of target star: 9.09 * magnitude drop [mag]: 9.44 * estimated maximum duration [s]: 0.860 * Moon: 86 % sunlit, 51° distance * Sun: 86° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.74 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 97°) * approx speed of asteroid's shadow [km/s]: 17.4085 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7427-00120-1 by 38573 1999 WA1 on 2024 Oct 14 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 44 0 0 5 8 25 9 8 0.9 1 122 76 5 3 25 5 13 25 4 56 5 5 20 46 .... 45 0 0 4 30 36 9 8 1.1 2 122 76 4 25 37 4 35 35 4 18 18 4 42 54 -0.08 46 0 0 3 53 8 9 8 1.4 3 123 76 3 48 10 3 58 6 3 40 52 4 5 24 -0.17 47 0 0 3 16 2 9 8 1.9 4 123 76 3 11 5 3 20 59 3 3 49 3 28 16 -0.21 48 0 0 2 39 20 9 8 2.5 5 123 76 2 34 24 2 44 16 2 27 9 2 51 32 -0.22 49 0 0 2 3 2 9 8 3.3 6 123 76 1 58 6 2 7 57 1 50 53 2 15 11 -0.24 50 0 0 1 27 9 9 8 4.2 8 123 76 1 22 15 1 32 4 1 15 3 1 39 17 -0.25 51 0 0 0 51 43 9 8 5.3 9 123 75 0 46 50 0 56 37 0 39 39 1 3 48 -0.25 52 0 0 0 16 44 9 8 6.6 10 123 75 0 11 51 0 21 37 0 4 42 0 28 46 -0.26 53 0 0 - 0 17 47 9 8 8.0 11 123 74 - 0 22 39 - 0 12 55 - 0 29 46 - 0 5 47 -0.26 54 0 0 - 0 51 49 9 8 9.5 12 123 74 - 0 56 40 - 0 46 58 - 1 3 46 - 0 39 51 -0.26 55 0 0 - 1 25 21 9 8 11.2 13 123 73 - 1 30 11 - 1 20 32 - 1 37 16 - 1 13 26 -0.27 56 0 0 - 1 58 23 9 8 13.0 14 123 72 - 2 3 12 - 1 53 35 - 2 10 15 - 1 46 31 -0.27 57 0 0 - 2 30 54 9 8 15.0 16 123 72 - 2 35 42 - 2 26 7 - 2 42 44 - 2 19 4 -0.27 58 0 0 - 3 2 53 9 8 17.1 17 123 71 - 3 7 40 - 2 58 7 - 3 14 40 - 2 51 6 -0.27 59 0 0 - 3 34 20 9 8 19.4 18 123 70 - 3 39 6 - 3 29 35 - 3 46 5 - 3 22 35 -0.28 60 0 0 - 4 5 14 9 8 21.8 19 123 69 - 4 9 59 - 4 0 29 - 4 16 56 - 3 53 31 -0.28 61 0 0 - 4 35 34 9 8 24.3 20 123 68 - 4 40 18 - 4 30 51 - 4 47 14 - 4 23 54 -0.28 62 0 0 - 5 5 21 9 8 27.0 21 123 67 - 5 10 3 - 5 0 38 - 5 16 58 - 4 53 43 -0.28 63 0 0 - 5 34 33 9 8 29.7 22 123 66 - 5 39 15 - 5 29 52 - 5 46 8 - 5 22 58 -0.28 64 0 0 - 6 3 10 9 8 32.6 23 123 65 - 6 7 51 - 5 58 30 - 6 14 42 - 5 51 38 -0.28 65 0 0 - 6 31 13 9 8 35.6 25 123 64 - 6 35 52 - 6 26 33 - 6 42 42 - 6 19 42 -0.28 66 0 0 - 6 58 39 9 8 38.8 26 122 64 - 7 3 18 - 6 54 1 - 7 10 6 - 6 47 11 -0.28 67 0 0 - 7 25 30 9 8 42.0 27 122 63 - 7 30 7 - 7 20 52 - 7 36 55 - 7 14 4 -0.29 68 0 0 - 7 51 45 9 8 45.4 28 122 62 - 7 56 21 - 7 47 8 - 8 3 7 - 7 40 21 -0.29 69 0 0 - 8 17 23 9 8 48.8 29 122 61 - 8 21 58 - 8 12 47 - 8 28 43 - 8 6 2 -0.29 70 0 0 - 8 42 24 9 8 52.4 30 122 60 - 8 46 59 - 8 37 50 - 8 53 42 - 8 31 6 -0.29 71 0 0 - 9 6 49 9 8 56.1 31 122 59 - 9 11 23 - 9 2 15 - 9 18 4 - 8 55 33 -0.29 72 0 0 - 9 30 37 9 8 59.8 32 122 58 - 9 35 10 - 9 26 4 - 9 41 50 - 9 19 23 -0.29 73 0 0 - 9 53 47 9 9 3.7 33 122 57 - 9 58 19 - 9 49 15 -10 4 58 - 9 42 36 -0.29 74 0 0 -10 16 21 9 9 7.7 34 122 56 -10 20 52 -10 11 49 -10 27 29 -10 5 11 -0.29 75 0 0 -10 38 16 9 9 11.7 35 122 55 -10 42 46 -10 33 46 -10 49 23 -10 27 9 -0.29 76 0 0 -10 59 35 9 9 15.8 36 122 54 -11 4 4 -10 55 5 -11 10 39 -10 48 30 -0.29 77 0 0 -11 20 15 9 9 20.1 37 122 53 -11 24 44 -11 15 47 -11 31 18 -11 9 12 -0.29 78 0 0 -11 40 19 9 9 24.4 38 122 52 -11 44 46 -11 35 51 -11 51 19 -11 29 18 -0.29 79 0 0 -11 59 44 9 9 28.8 39 122 51 -12 4 11 -11 55 17 -12 10 42 -11 48 45 -0.29 80 0 0 -12 18 32 9 9 33.2 40 122 50 -12 22 58 -12 14 5 -12 29 28 -12 7 35 -0.29 81 0 0 -12 36 42 9 9 37.8 41 122 49 -12 41 7 -12 32 16 -12 47 36 -12 25 46 -0.29 82 0 0 -12 54 14 9 9 42.4 42 122 48 -12 58 38 -12 49 49 -13 5 6 -12 43 20 -0.30 83 0 0 -13 11 8 9 9 47.1 43 122 47 -13 15 32 -13 6 44 -13 21 59 -13 0 17 -0.30 84 0 0 -13 27 25 9 9 51.8 44 122 46 -13 31 48 -13 23 2 -13 38 14 -13 16 35 -0.30 85 0 0 -13 43 4 9 9 56.7 45 122 45 -13 47 26 -13 38 41 -13 53 51 -13 32 16 -0.30 86 0 0 -13 58 5 9 10 1.6 46 122 44 -14 2 27 -13 53 43 -14 8 51 -13 47 18 -0.30 87 0 0 -14 12 29 9 10 6.5 47 123 43 -14 16 50 -14 8 7 -14 23 13 -14 1 44 -0.30 88 0 0 -14 26 15 9 10 11.5 48 123 42 -14 30 35 -14 21 54 -14 36 58 -14 15 31 -0.30 89 0 0 -14 39 23 9 10 16.6 49 123 41 -14 43 43 -14 35 3 -14 50 5 -14 28 41 -0.30 90 0 0 -14 51 54 9 10 21.8 50 123 40 -14 56 13 -14 47 34 -15 2 34 -14 41 13 -0.30 91 0 0 -15 3 47 9 10 27.0 51 123 39 -15 8 6 -14 59 28 -15 14 26 -14 53 8 -0.30 92 0 0 -15 15 3 9 10 32.2 52 123 38 -15 19 22 -15 10 45 -15 25 41 -15 4 25 -0.30 93 0 0 -15 25 42 9 10 37.5 53 124 37 -15 30 0 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54.0 55 220 -25 - 6 41 59 - 6 32 39 - 6 48 50 - 6 25 47 -0.30 155 0 0 - 6 9 3 9 17 0.1 54 221 -26 - 6 13 45 - 6 4 22 - 6 20 37 - 5 57 29 -0.30 156 0 0 - 5 40 11 9 17 6.1 53 221 -27 - 5 44 53 - 5 35 29 - 5 51 48 - 5 28 34 -0.30 157 0 0 - 5 10 43 9 17 12.1 52 222 -28 - 5 15 26 - 5 5 59 - 5 22 22 - 4 59 3 -0.30 158 0 0 - 4 40 38 9 17 18.0 51 222 -30 - 4 45 23 - 4 35 54 - 4 52 20 - 4 28 56 -0.30 159 0 0 - 4 9 58 9 17 23.9 50 222 -31 - 4 14 44 - 4 5 13 - 4 21 43 - 3 58 13 -0.30 160 0 0 - 3 38 44 9 17 29.6 48 223 -32 - 3 43 30 - 3 33 57 - 3 50 31 - 3 26 56 -0.30 161 0 0 - 3 6 54 9 17 35.3 47 223 -33 - 3 11 42 - 3 2 7 - 3 18 44 - 2 55 4 -0.30 162 0 0 - 2 34 31 9 17 41.0 46 224 -34 - 2 39 20 - 2 29 43 - 2 46 24 - 2 22 38 -0.30 163 0 0 - 2 1 35 9 17 46.5 45 224 -35 - 2 6 25 - 1 56 45 - 2 13 30 - 1 49 40 -0.30 164 0 0 - 1 28 6 9 17 52.0 44 224 -36 - 1 32 57 - 1 23 15 - 1 40 4 - 1 16 8 -0.30 165 0 0 - 0 54 6 9 17 57.3 43 224 -37 - 0 58 57 - 0 49 14 - 1 6 6 - 0 42 5 -0.30 166 0 0 - 0 19 34 9 18 2.6 42 225 -38 - 0 24 27 - 0 14 41 - 0 31 36 - 0 7 30 -0.30 167 0 0 0 15 28 9 18 7.8 41 225 -40 0 10 34 0 20 22 0 3 23 0 27 34 -0.30 168 0 0 0 51 0 9 18 12.9 40 225 -41 0 46 5 0 55 55 0 38 52 1 3 8 -0.29 169 0 0 1 27 0 9 18 17.8 38 226 -42 1 22 4 1 31 56 1 14 50 1 39 11 -0.29 170 0 0 2 3 28 9 18 22.7 37 226 -43 1 58 31 2 8 25 1 51 15 2 15 41 -0.29 171 0 0 2 40 22 9 18 27.4 36 226 -44 2 35 24 2 45 20 2 28 7 2 52 38 -0.29 172 0 0 3 17 42 9 18 32.1 35 226 -45 3 12 43 3 22 41 3 5 25 3 30 0 -0.29 173 0 0 3 55 27 9 18 36.6 34 227 -46 3 50 27 4 0 27 3 43 7 4 7 47 -0.29 174 0 0 4 33 35 9 18 40.9 33 227 -47 4 28 34 4 38 35 4 21 13 4 45 57 -0.29 175 0 0 5 12 5 9 18 45.2 31 227 -48 5 7 3 5 17 6 4 59 41 5 24 29 -0.29 176 0 0 5 50 56 9 18 49.3 30 227 -49 5 45 53 5 55 58 5 38 30 6 3 23 -0.29 177 0 0 6 30 6 9 18 53.2 29 227 -51 6 25 3 6 35 10 6 17 38 6 42 35 -0.29 178 0 0 7 9 35 9 18 57.1 28 228 -52 7 4 31 7 14 40 6 57 5 7 22 6 -0.29 179 0 0 7 49 22 9 19 0.7 27 228 -53 7 44 17 7 54 27 7 36 50 8 1 54 -0.29 180 0 0 8 29 24 9 19 4.3 25 228 -54 8 24 18 8 34 29 8 16 50 8 41 58 -0.29 -179 0 0 9 9 40 9 19 7.7 24 228 -55 9 4 34 9 14 46 8 57 4 9 22 16 -0.29 -178 0 0 9 50 9 9 19 10.9 23 229 -56 9 45 2 9 55 16 9 37 32 10 2 47 -0.29 -177 0 0 10 30 49 9 19 14.0 22 229 -57 10 25 42 10 35 57 10 18 11 10 43 29 -0.29 -176 0 0 11 11 40 9 19 16.9 21 229 -58 11 6 32 11 16 48 10 59 0 11 24 21 -0.29 -175 0 0 11 52 38 9 19 19.6 20 229 -59 11 47 30 11 57 47 11 39 57 12 5 21 -0.29 -174 0 0 12 33 44 9 19 22.2 18 230 -60 12 28 35 12 38 53 12 21 2 12 46 27 -0.29 -173 0 0 13 14 55 9 19 24.7 17 230 -61 13 9 45 13 20 5 13 2 11 13 27 40 -0.29 -172 0 0 13 56 10 9 19 26.9 16 230 -61 13 51 0 14 1 20 13 43 25 14 8 55 -0.29 -171 0 0 14 37 27 9 19 29.0 15 230 -62 14 32 17 14 42 37 14 24 41 14 50 13 -0.29 -170 0 0 15 18 45 9 19 31.0 14 231 -63 15 13 34 15 23 55 15 5 58 15 31 32 -0.29 -169 0 0 16 0 2 9 19 32.7 12 231 -64 15 54 51 16 5 13 15 47 15 16 12 50 -0.29 -168 0 0 16 41 16 9 19 34.3 11 231 -65 16 36 5 16 46 28 16 28 29 16 54 5 -0.29 -167 0 0 17 22 27 9 19 35.8 10 232 -65 17 17 16 17 27 38 17 9 39 17 35 16 -0.29 -166 0 0 18 3 32 9 19 37.1 9 232 -66 17 58 21 18 8 44 17 50 44 18 16 22 -0.29 -165 0 0 18 44 31 9 19 38.2 8 232 -67 18 39 19 18 49 43 18 31 42 18 57 20 -0.29 -164 0 0 19 25 21 9 19 39.1 7 233 -67 19 20 10 19 30 33 19 12 33 19 38 11 -0.29 -163 0 0 20 6 1 9 19 39.9 5 233 -68 20 0 50 20 11 13 19 53 13 20 18 51 -0.29 -162 0 0 20 46 30 9 19 40.6 4 233 -68 20 41 19 20 51 42 20 33 42 20 59 20 -0.28 -161 0 0 21 26 47 9 19 41.0 3 234 -69 21 21 36 21 31 58 21 13 59 21 39 36 -0.28 -160 0 0 22 6 50 9 19 41.3 2 234 -69 22 1 38 22 12 1 21 54 2 22 19 38 -0.28 -159 0 0 22 46 37 9 19 41.5 1 234 -69 22 41 26 22 51 48 22 33 50 22 59 25 -0.25 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 7427-00120-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 20 44.6893 DE: -32 15 38.626 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 20 44.6892 DE: -32 15 38.627 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.1 * B mag [mag]: 9.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (38573) 1999 WA1 asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.98300 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#43 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): 0.015", 0.002", 97.37° remarks: * orbital elements for (38573)1999 WA1 : Mean anomaly = 261.6188982253 deg Arg. of pericenter = 326.8693899018 deg Long. of node = 88.1883912670 deg Inclination = 15.4607105882 deg Eccentricity = 0.0834592949 Semimajor axis = 3.0236438302 AU Perihelion dist = 2.7712926480 AU Mag: H = 12.74, G = 0.15 Epoch of elements : MJD 60597.38462258 TDT (2024 Oct 14.3846) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#432023Apr25,0.86,2024,10,14,9.230953,-0.053559,0.287013,9.657582,1.810621,0.005760,0.000753,0.000000,0.000000 128.7085,-32.2163,38.02,-8.39,False TYC 7427-00120-1,19.34574706,-32.2607295,9.64,9.09,8.79,0.1,0,,19.37231310,-32.2163023,9.44,9.29,0,0,0 38573,1999 WA1,18.53,14.955,2.9830,0,0,2.244,5.34,,3.6,0 0,261.5468,2024,10,14,326.8694,88.1884,15.4607,0.08346,3.02364,2.77129,12.75,5.0,0.15 1.734,0.0147,0.0024,97,0.0051,Known errors,0.96,0,-1,-1 20241014_0120-1,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org