IOTA/IOTA-ES occultation update for (1620) Geographos / TYC 6306-00952-1 event on 2023 Nov 15, 22:39 UT Visible from Summary ------- On 2023 Nov 15 UT, the 2.946 km diameter asteroid (1620) Geographos will occult a 11.5 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 6.23 mag to 17.75 mag (the magnitude of the asteroid) for at most 0.070 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: 2023 Nov 15, 22:38 - 2023 Nov 15, 22:40 * geocentric midpoint of event [JD]: 2460264.44396146 * magnitude of target star: 11.52 * magnitude drop [mag]: 6.23 * estimated maximum duration [s]: 0.070 * Moon: 7 % sunlit, 29° distance * Sun: 59° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 8 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 0.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.001", 65°) * approx speed of asteroid's shadow [km/s]: 41.2191 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6306-00952-1 by 1620 Geographos on 2023 Nov 15 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 -167 0 0 45 49 39 22 38 21.8 1 121 26 45 47 9 45 52 9 45 46 2 45 53 16 .... -166 0 0 45 26 38 22 38 21.9 1 121 26 45 24 10 45 29 6 45 23 4 45 30 12 -1.58 -165 0 0 45 4 43 22 38 22.0 2 122 26 45 2 16 45 7 9 45 1 12 45 8 15 -1.93 -164 0 0 44 43 53 22 38 22.3 3 123 27 44 41 28 44 46 18 44 40 24 44 47 22 -2.10 -163 0 0 44 24 8 22 38 22.6 4 124 27 44 21 44 44 26 31 44 20 41 44 27 35 -2.19 -162 0 0 44 5 26 22 38 23.1 5 124 27 44 3 4 44 7 48 44 2 2 44 8 52 -2.26 -161 0 0 43 47 49 22 38 23.5 5 125 28 43 45 28 43 50 9 43 44 26 43 51 12 -2.30 -160 0 0 43 31 14 22 38 24.1 6 126 28 43 28 55 43 33 34 43 27 53 43 34 36 -2.33 -159 0 0 43 15 42 22 38 24.7 7 126 28 43 13 24 43 18 1 43 12 23 43 19 2 -2.36 -158 0 0 43 1 13 22 38 25.5 8 127 28 42 58 55 43 3 30 42 57 55 43 4 32 -2.38 -157 0 0 42 47 45 22 38 26.2 8 128 28 42 45 29 42 50 2 42 44 28 42 51 3 -2.40 -156 0 0 42 35 20 22 38 27.1 9 129 29 42 33 4 42 37 35 42 32 4 42 38 36 -2.41 -155 0 0 42 23 55 22 38 28.0 10 129 29 42 21 41 42 26 10 42 20 41 42 27 11 -2.43 -154 0 0 42 13 33 22 38 29.0 10 130 29 42 11 18 42 15 47 42 10 19 42 16 47 -2.44 -153 0 0 42 4 11 22 38 30.0 11 131 29 42 1 57 42 6 24 42 0 58 42 7 24 -2.45 -152 0 0 41 55 50 22 38 31.1 12 131 29 41 53 37 41 58 3 41 52 38 41 59 2 -2.46 -151 0 0 41 48 29 22 38 32.3 12 132 29 41 46 17 41 50 42 41 45 18 41 51 41 -2.46 -150 0 0 41 42 10 22 38 33.5 13 133 29 41 39 57 41 44 22 41 38 59 41 45 21 -2.47 -149 0 0 41 36 50 22 38 34.8 14 134 28 41 34 39 41 39 2 41 33 40 41 40 1 -2.48 -148 0 0 41 32 32 22 38 36.1 14 135 28 41 30 20 41 34 43 41 29 22 41 35 42 -2.48 -147 0 0 41 29 13 22 38 37.5 15 135 28 41 27 2 41 31 25 41 26 3 41 32 23 -2.49 -146 0 0 41 26 55 22 38 38.9 15 136 28 41 24 44 41 29 6 41 23 45 41 30 5 -2.49 -145 0 0 41 25 37 22 38 40.4 16 137 28 41 23 26 41 27 48 41 22 28 41 28 47 -2.50 -144 0 0 41 25 20 22 38 42.0 16 138 27 41 23 8 41 27 31 41 22 10 41 28 29 -2.50 -143 0 0 41 26 2 22 38 43.6 17 139 27 41 23 51 41 28 14 41 22 53 41 29 12 -2.50 -142 0 0 41 27 45 22 38 45.2 17 139 27 41 25 34 41 29 57 41 24 36 41 30 56 -2.51 -141 0 0 41 30 29 22 38 46.9 18 140 27 41 28 17 41 32 41 41 27 19 41 33 39 -2.51 -140 0 0 41 34 13 22 38 48.6 18 141 26 41 32 1 41 36 25 41 31 3 41 37 24 -2.51 -139 0 0 41 38 58 22 38 50.4 19 142 26 41 36 46 41 41 10 41 35 47 41 42 9 -2.52 -138 0 0 41 44 44 22 38 52.2 19 143 25 41 42 31 41 46 56 41 41 32 41 47 55 -2.52 -137 0 0 41 51 30 22 38 54.0 19 144 25 41 49 17 41 53 43 41 48 18 41 54 43 -2.52 -136 0 0 41 59 18 22 38 55.9 20 145 24 41 57 4 42 1 32 41 56 5 42 2 31 -2.52 -135 0 0 42 8 7 22 38 57.8 20 146 24 42 5 53 42 10 21 42 4 53 42 11 21 -2.53 -134 0 0 42 17 58 22 38 59.7 20 147 23 42 15 43 42 20 13 42 14 43 42 21 13 -2.53 -133 0 0 42 28 50 22 39 1.7 20 148 23 42 26 35 42 31 6 42 25 35 42 32 6 -2.53 -132 0 0 42 40 45 22 39 3.7 21 149 22 42 38 29 42 43 2 42 37 28 42 44 2 -2.53 -131 0 0 42 53 42 22 39 5.7 21 149 22 42 51 25 42 56 0 42 50 24 42 57 1 -2.53 -130 0 0 43 7 42 22 39 7.8 21 150 21 43 5 24 43 10 1 43 4 23 43 11 2 -2.54 -129 0 0 43 22 46 22 39 9.8 21 151 20 43 20 26 43 25 5 43 19 24 43 26 7 -2.54 -128 0 0 43 38 52 22 39 11.9 21 152 20 43 36 32 43 41 13 43 35 30 43 42 16 -2.54 -127 0 0 43 56 3 22 39 14.0 21 153 19 43 53 42 43 58 25 43 52 39 43 59 29 -2.54 -126 0 0 44 14 19 22 39 16.2 21 154 18 44 11 56 44 16 42 44 10 53 44 17 46 -2.54 -125 0 0 44 33 40 22 39 18.3 21 155 18 44 31 15 44 36 5 44 30 11 44 37 9 -2.54 -124 0 0 44 54 6 22 39 20.4 21 156 17 44 51 40 44 56 32 44 50 35 44 57 37 -2.55 -123 0 0 45 15 39 22 39 22.6 21 158 16 45 13 11 45 18 7 45 12 5 45 19 13 -2.55 -122 0 0 45 38 18 22 39 24.8 21 159 16 45 35 49 45 40 48 45 34 42 45 41 55 -2.55 -121 0 0 46 2 6 22 39 26.9 21 160 15 45 59 34 46 4 38 45 58 27 46 5 46 -2.55 -120 0 0 46 27 2 22 39 29.1 21 161 14 46 24 29 46 29 37 46 23 20 46 30 45 -2.55 -119 0 0 46 53 8 22 39 31.2 21 162 13 46 50 32 46 55 45 46 49 23 46 56 55 -2.55 -118 0 0 47 20 25 22 39 33.4 21 163 12 47 17 46 47 23 4 47 16 36 47 24 15 -2.55 -117 0 0 47 48 53 22 39 35.5 20 164 12 47 46 12 47 51 35 47 45 0 47 52 47 -2.56 -116 0 0 48 18 34 22 39 37.7 20 165 11 48 15 50 48 21 19 48 14 37 48 22 32 -2.56 -115 0 0 48 49 30 22 39 39.8 20 166 10 48 46 42 48 52 17 48 45 28 48 53 32 -2.56 -114 0 0 49 21 41 22 39 41.9 19 167 9 49 18 51 49 24 32 49 17 35 49 25 49 -2.56 -113 0 0 49 55 11 22 39 44.0 19 168 8 49 52 16 49 58 5 49 50 59 49 59 23 -2.56 -112 0 0 50 30 0 22 39 46.0 19 169 7 50 27 1 50 32 58 50 25 42 50 34 18 -2.56 -111 0 0 51 6 10 22 39 48.1 18 170 7 51 3 8 51 9 14 51 1 47 51 10 35 -2.57 -110 0 0 51 43 46 22 39 50.1 18 171 6 51 40 38 51 46 54 51 39 15 51 48 17 -2.57 -109 0 0 52 22 48 22 39 52.0 17 172 5 52 19 36 52 26 2 52 18 10 52 27 28 -2.57 -108 0 0 53 3 22 22 39 54.0 16 173 4 53 0 3 53 6 41 52 58 36 53 8 10 -2.58 -107 0 0 53 45 30 22 39 55.9 16 174 3 53 42 6 53 48 56 53 40 35 53 50 28 -2.58 -106 0 0 54 29 19 22 39 57.7 15 175 2 54 25 47 54 32 51 54 24 13 54 34 26 -2.58 -105 0 0 55 14 52 22 39 59.5 14 176 1 55 11 12 55 18 33 55 9 35 55 20 11 -2.59 -104 0 0 56 2 18 22 40 1.2 14 177 0 55 58 29 56 6 7 55 56 48 56 7 50 -2.59 -103 0 0 56 51 44 22 40 2.9 13 178 -1 56 47 45 56 55 44 56 46 0 56 57 32 -2.60 -102 0 0 57 43 22 22 40 4.5 12 179 -2 57 39 12 57 47 34 57 37 21 57 49 27 -2.61 -101 0 0 58 37 25 22 40 6.1 11 180 -3 58 33 1 58 41 52 58 31 4 58 43 51 -2.62 -100 0 0 59 34 11 22 40 7.5 10 181 -4 59 29 30 59 38 54 59 27 26 59 41 0 -2.63 - 99 0 0 60 34 3 22 40 8.9 9 182 -4 60 29 3 60 39 6 60 26 50 60 41 22 -2.65 - 98 0 0 61 37 35 22 40 10.2 8 183 -5 61 32 10 61 43 4 61 29 46 61 45 31 -2.67 - 97 0 1 62 45 35 22 40 11.3 7 184 -6 62 39 37 62 51 36 62 37 0 62 54 19 -2.71 - 96 0 1 63 59 18 22 40 12.4 6 185 -7 63 52 37 64 6 5 63 49 41 64 9 8 -2.77 - 95 0 1 65 20 56 22 40 13.3 4 186 -8 65 13 11 65 28 52 65 9 47 65 32 26 -2.89 - 94 0 1 66 54 55 22 40 13.9 3 187 -9 66 45 20 67 4 50 66 41 9 67 9 21 -3.20 - 93 0 1 68 53 32 22 40 14.3 1 187 -11 68 39 36 69 8 30 68 33 41 69 15 32 -6.16 Uncertainty in time = +/- 0 secs Prediction of 2023 Nov 13.9 Data for the target star ------------------------ * name: TYC 6306-00952-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 34 10.5912 DE: -20 29 06.522 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 34 10.5910 DE: -20 29 06.523 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.400) * V mag [mag]: 11.5 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1620) Geographos asteroid class: approx. diameter [km]: 3 approx. diameter ["]: 0.003 distance from Earth [AU]: 1.20490 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#749 date of fit: 2023 Nov 10 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): 0.005", 0.000", 64.733° remarks: * orbital elements for (1620)Geographos : Mean anomaly = 51.1749038826 deg Arg. of pericenter = 276.9537891353 deg Long. of node = 337.1716799278 deg Inclination = 13.3361381653 deg Eccentricity = 0.3355014180 Semimajor axis = 1.2456625492 AU Perihelion dist = 0.8277409976 AU Mag: H = 15.27, G = 0.15 Epoch of elements : MJD 60263.94396130 TDT (2023 Nov 15.9440) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#7492023Nov10,0.07,2023,11,15,22.655075,-0.293941,0.881216,22.071688,7.356000,0.001400,0.000249,-0.000001,0.000000 -100.6915,-20.4345,-163.67,-18.60,False TYC 6306-00952-1,19.56960874,-20.4851448,11.81,11.52,11.36,0.0,0,,19.59267569,-20.4344955,6.24,5.95,0,0,0 1620,Geographos,17.75,2.946,1.2049,0,0,11.459,53.71,,0.2,0 0,50.5057,2023,11,15,276.9538,337.1717,13.3361,0.33550,1.24566,0.82774,15.27,5.0,0.15 1.222,0.0047,0.0005,65,0.0047,Known errors,-1.00,0,-1,-1 20231115_0952-1,60261.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Nov 13, 20:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org