IOTA/IOTA-ES occultation update for (1796) Riga / UCAC4 491-100544 event on 2022 Jun 04, 07:27 UT Visible from USA, SW Canada Summary ------- On 2022 Jun 04 UT, the 72.5 km diameter asteroid (1796) Riga will occult a 12.9 mag star in the constellation Aquila for observers along a path across USA, SW Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.42 mag to 15.22 mag (the magnitude of the asteroid) for at most 7.160 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: 2022 Jun 04, 07:17 - 2022 Jun 04, 07:37 * geocentric midpoint of event [JD]: 2459734.81074120 * magnitude of target star: 12.92 * magnitude drop [mag]: 2.42 * estimated maximum duration [s]: 7.160 * Moon: 20 % sunlit, 141° distance * Sun: 134° distance * rough path description: USA, SW Canada The occultation path -------------------- * approximate projected width [km]: 78 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.005", 94°) * approx speed of asteroid's shadow [km/s]: 10.1205 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 491-100544 by 1796 Riga on 2022 Jun 4 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 ' " Longitude Longitude Longitude Longitude .. .. .. -14 0 0 .. .. .... .. .. .. ... .. .. 12 16 27 ... .. .. 11 21 51 .... 8 33 37 -13 0 0 7 17 44.3 5 279 20 10 30 27 6 47 53 11 21 51 6 7 34 .... 3 59 20 -12 0 0 7 17 50.7 9 280 17 5 31 15 2 32 56 6 10 18 1 59 19 -0.30 Latitude Latitude Latitude Latitude 2 0 0 -11 29 38 7 17 54.8 11 281 15 -11 7 49 -11 51 23 -10 58 58 -12 0 11 -0.36 1 0 0 -11 13 23 7 17 57.2 12 281 14 -10 51 31 -11 35 12 -10 42 39 -11 44 1 -0.38 0 0 0 -10 56 29 7 17 59.8 13 281 14 -10 34 33 -11 18 22 -10 25 40 -11 27 12 -0.38 - 1 0 0 -10 38 56 7 18 2.6 14 281 13 -10 16 56 -11 0 52 -10 8 1 -11 9 44 -0.38 - 2 0 0 -10 20 43 7 18 5.6 15 281 12 - 9 58 40 -10 42 43 - 9 49 43 -10 51 37 -0.38 - 3 0 0 -10 1 51 7 18 8.8 16 282 11 - 9 39 44 -10 23 55 - 9 30 46 -10 32 50 -0.38 - 4 0 0 - 9 42 20 7 18 12.3 17 282 11 - 9 20 9 -10 4 29 - 9 11 9 -10 13 25 -0.38 - 5 0 0 - 9 22 10 7 18 16.0 18 282 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59 4 -0.40 - 69 0 0 29 18 0 7 28 32.5 67 203 -24 29 44 54 28 51 13 29 55 49 28 40 24 -0.40 - 70 0 0 29 59 2 7 28 44.2 67 200 -24 30 25 55 29 32 15 30 36 50 29 21 26 -0.40 - 71 0 0 30 39 43 7 28 55.8 67 197 -24 31 6 36 30 12 57 31 17 30 30 2 9 -0.40 - 72 0 0 31 20 3 7 29 7.3 66 194 -24 31 46 54 30 53 18 31 57 49 30 42 30 -0.40 - 73 0 0 32 0 0 7 29 18.6 66 192 -24 32 26 51 31 33 16 32 37 44 31 22 29 -0.40 - 74 0 0 32 39 34 7 29 29.8 65 189 -24 33 6 23 32 12 52 33 17 16 32 2 5 -0.40 - 75 0 0 33 18 44 7 29 40.9 65 187 -24 33 45 31 32 52 3 33 56 23 32 41 17 -0.40 - 76 0 0 33 57 27 7 29 51.8 64 184 -24 34 24 12 33 30 49 34 35 4 33 20 4 -0.41 - 77 0 0 34 35 45 7 30 2.6 64 182 -24 35 2 27 34 9 9 35 13 18 33 58 25 -0.41 - 78 0 0 35 13 35 7 30 13.2 63 180 -24 35 40 14 34 47 1 35 51 4 34 36 18 -0.41 - 79 0 0 35 50 56 7 30 23.7 62 178 -24 36 17 33 35 24 26 36 28 21 35 13 44 -0.41 - 80 0 0 36 27 49 7 30 34.0 62 176 -23 36 54 22 36 1 21 37 5 9 35 50 40 -0.41 - 81 0 0 37 4 11 7 30 44.2 61 174 -23 37 30 42 36 37 47 37 41 27 36 27 8 -0.41 - 82 0 0 37 40 3 7 30 54.1 60 172 -23 38 6 30 37 13 43 38 17 14 37 3 5 -0.41 - 83 0 0 38 15 24 7 31 4.0 60 171 -23 38 41 47 37 49 7 38 52 30 37 38 31 -0.41 - 84 0 0 38 50 14 7 31 13.6 59 169 -23 39 16 33 38 24 1 39 27 14 38 13 26 -0.41 - 85 0 0 39 24 31 7 31 23.1 58 167 -23 39 50 45 38 58 22 40 1 25 38 47 49 -0.41 - 86 0 0 39 58 15 7 31 32.4 58 166 -23 40 24 25 39 32 10 40 35 3 39 21 39 -0.41 - 87 0 0 40 31 26 7 31 41.6 57 164 -23 40 57 32 40 5 26 41 8 7 39 54 57 -0.41 - 88 0 0 41 4 4 7 31 50.5 56 163 -22 41 30 5 40 38 9 41 40 38 40 27 41 -0.41 - 89 0 0 41 36 8 7 31 59.3 55 161 -22 42 2 4 41 10 17 42 12 35 40 59 52 -0.41 - 90 0 0 42 7 38 7 32 7.9 55 160 -22 42 33 29 41 41 52 42 43 58 41 31 29 -0.41 - 91 0 0 42 38 33 7 32 16.4 54 159 -22 43 4 19 42 12 53 43 14 46 42 2 31 -0.41 - 92 0 0 43 8 54 7 32 24.7 53 157 -22 43 34 35 42 43 20 43 45 0 42 33 0 -0.41 - 93 0 0 43 38 41 7 32 32.8 52 156 -21 44 4 16 43 13 12 44 14 39 43 2 54 -0.41 - 94 0 0 44 7 53 7 32 40.7 52 155 -21 44 33 22 43 42 29 44 43 43 43 32 14 -0.41 - 95 0 0 44 36 30 7 32 48.5 51 154 -21 45 1 54 44 11 12 45 12 12 44 0 59 -0.41 - 96 0 0 45 4 33 7 32 56.1 50 152 -21 45 29 51 44 39 20 45 40 6 44 29 10 -0.41 - 97 0 0 45 32 0 7 33 3.5 49 151 -20 45 57 13 45 6 54 46 7 26 44 56 46 -0.41 - 98 0 0 45 58 54 7 33 10.8 49 150 -20 46 24 0 45 33 53 46 34 11 45 23 47 -0.41 - 99 0 0 46 25 12 7 33 17.9 48 149 -20 46 50 12 46 0 18 47 0 21 45 50 14 -0.41 -100 0 0 46 50 57 7 33 24.8 47 148 -20 47 15 51 46 26 8 47 25 57 46 16 7 -0.41 -101 0 0 47 16 7 7 33 31.6 47 147 -19 47 40 55 46 51 24 47 50 58 46 41 26 -0.41 -102 0 0 47 40 43 7 33 38.2 46 146 -19 48 5 25 47 16 6 48 15 26 47 6 10 -0.41 -103 0 0 48 4 45 7 33 44.7 45 145 -19 48 29 21 47 40 15 48 39 19 47 30 21 -0.41 -104 0 0 48 28 14 7 33 51.0 45 144 -19 48 52 43 48 3 49 49 2 39 47 53 58 -0.41 -105 0 0 48 51 9 7 33 57.2 44 143 -18 49 15 32 48 26 50 49 25 25 48 17 2 -0.41 -106 0 0 49 13 31 7 34 3.2 43 142 -18 49 37 48 48 49 19 49 47 39 48 39 32 -0.41 -107 0 0 49 35 20 7 34 9.1 42 141 -18 49 59 31 49 11 14 50 9 19 49 1 30 -0.41 -108 0 0 49 56 36 7 34 14.9 42 140 -18 50 20 41 49 32 36 50 30 27 49 22 55 -0.41 -109 0 0 50 17 21 7 34 20.5 41 139 -17 50 41 19 49 53 27 50 51 3 49 43 48 -0.41 -110 0 0 50 37 33 7 34 26.0 40 138 -17 51 1 25 50 13 45 51 11 6 50 4 9 -0.41 -111 0 0 50 57 14 7 34 31.3 40 137 -17 51 21 0 50 33 32 51 30 38 50 23 58 -0.41 -112 0 0 51 16 23 7 34 36.5 39 136 -16 51 40 3 50 52 47 51 49 39 50 43 15 -0.41 -113 0 0 51 35 1 7 34 41.6 38 135 -16 51 58 36 51 11 31 52 8 9 51 2 2 -0.41 -114 0 0 51 53 9 7 34 46.6 38 134 -16 52 16 38 51 29 45 52 26 9 51 20 18 -0.41 -115 0 0 52 10 47 7 34 51.4 37 133 -16 52 34 9 51 47 28 52 43 38 51 38 4 -0.41 -116 0 0 52 27 54 7 34 56.1 37 132 -15 52 51 11 52 4 42 53 0 38 51 55 19 -0.41 -117 0 0 52 44 32 7 35 0.8 36 131 -15 53 7 44 52 21 25 53 17 8 52 12 5 -0.41 -118 0 0 53 0 41 7 35 5.2 35 130 -15 53 23 47 52 37 40 53 33 9 52 28 22 -0.41 -119 0 0 53 16 21 7 35 9.6 35 130 -14 53 39 21 52 53 25 53 48 41 52 44 9 -0.41 -120 0 0 53 31 33 7 35 13.9 34 129 -14 53 54 27 53 8 42 54 3 45 52 59 28 -0.41 -121 0 0 53 46 16 7 35 18.1 33 128 -14 54 9 5 53 23 30 54 18 21 53 14 19 -0.41 -122 0 0 54 0 31 7 35 22.1 33 127 -13 54 23 15 53 37 51 54 32 29 53 28 42 -0.41 -123 0 0 54 14 19 7 35 26.1 32 126 -13 54 36 58 53 51 44 54 46 9 53 42 37 -0.41 -124 0 0 54 27 40 7 35 29.9 32 125 -13 54 50 14 54 5 10 54 59 23 53 56 4 -0.41 -125 0 0 54 40 34 7 35 33.7 31 124 -12 55 3 3 54 18 9 55 12 10 54 9 5 -0.41 -126 0 0 54 53 1 7 35 37.4 30 123 -12 55 15 26 54 30 41 55 24 31 54 21 39 -0.41 -127 0 0 55 5 3 7 35 41.0 30 122 -12 55 27 22 54 42 47 55 36 26 54 33 47 -0.41 -128 0 0 55 16 38 7 35 44.4 29 121 -12 55 38 53 54 54 26 55 47 55 54 45 29 -0.41 -129 0 0 55 27 48 7 35 47.8 29 121 -11 55 49 59 55 5 41 55 58 58 54 56 45 -0.41 -130 0 0 55 38 32 7 35 51.2 28 120 -11 56 0 39 55 16 29 56 9 37 55 7 35 -0.41 -131 0 0 55 48 52 7 35 54.4 28 119 -11 56 10 54 55 26 53 56 19 50 55 18 0 -0.41 -132 0 0 55 58 47 7 35 57.5 27 118 -10 56 20 45 55 36 52 56 29 40 55 28 1 -0.41 -133 0 0 56 8 17 7 36 0.6 26 117 -10 56 30 12 55 46 26 56 39 5 55 37 37 -0.41 -134 0 0 56 17 24 7 36 3.6 26 116 -10 56 39 14 55 55 36 56 48 6 55 46 48 -0.41 -135 0 0 56 26 6 7 36 6.5 25 115 -9 56 47 53 56 4 22 56 56 43 55 55 36 -0.41 -136 0 0 56 34 25 7 36 9.3 25 114 -9 56 56 8 56 12 45 57 4 57 56 3 59 -0.41 -137 0 0 56 42 20 7 36 12.1 24 114 -9 57 4 0 56 20 43 57 12 47 56 11 59 -0.41 -138 0 0 56 49 52 7 36 14.7 24 113 -8 57 11 29 56 28 18 57 20 15 56 19 36 -0.40 -139 0 0 56 57 1 7 36 17.4 23 112 -8 57 18 35 56 35 31 57 27 19 56 26 49 -0.40 -140 0 0 57 3 47 7 36 19.9 23 111 -8 57 25 18 56 42 20 57 34 2 56 33 40 -0.40 -141 0 0 57 10 11 7 36 22.4 22 110 -7 57 31 39 56 48 46 57 40 21 56 40 7 -0.40 -142 0 0 57 16 12 7 36 24.8 22 109 -7 57 37 38 56 54 50 57 46 19 56 46 12 -0.40 -143 0 0 57 21 51 7 36 27.1 21 108 -7 57 43 14 57 0 32 57 51 54 56 51 55 -0.40 -144 0 0 57 27 8 7 36 29.4 20 108 -7 57 48 29 57 5 51 57 57 8 56 57 15 -0.40 -145 0 0 57 32 3 7 36 31.6 20 107 -6 57 53 22 57 10 48 58 2 0 57 2 13 -0.40 -146 0 0 57 36 37 7 36 33.7 19 106 -6 57 57 53 57 15 24 58 6 30 57 6 49 -0.40 -147 0 0 57 40 48 7 36 35.8 19 105 -6 58 2 3 57 19 37 58 10 39 57 11 4 -0.40 -148 0 0 57 44 38 7 36 37.8 18 104 -5 58 5 51 57 23 29 58 14 27 57 14 56 -0.40 -149 0 0 57 48 7 7 36 39.8 18 103 -5 58 9 18 57 26 59 58 17 53 57 18 27 -0.40 -150 0 0 57 51 14 7 36 41.7 17 102 -5 58 12 24 57 30 8 58 20 59 57 21 36 -0.40 -151 0 0 57 54 1 7 36 43.5 17 102 -4 58 15 9 57 32 56 58 23 43 57 24 24 -0.40 -152 0 0 57 56 26 7 36 45.3 16 101 -4 58 17 33 57 35 22 58 26 6 57 26 51 -0.40 -153 0 0 57 58 29 7 36 47.0 16 100 -4 58 19 35 57 37 27 58 28 9 57 28 56 -0.40 -154 0 0 58 0 12 7 36 48.7 15 99 -3 58 21 17 57 39 10 58 29 50 57 30 40 -0.40 -155 0 0 58 1 34 7 36 50.3 15 98 -3 58 22 38 57 40 33 58 31 11 57 32 3 -0.40 -156 0 0 58 2 35 7 36 51.9 14 97 -3 58 23 39 57 41 34 58 32 11 57 33 5 -0.40 -157 0 0 58 3 15 7 36 53.4 14 96 -2 58 24 18 57 42 14 58 32 50 57 33 45 -0.41 -158 0 0 58 3 34 7 36 54.8 13 96 -2 58 24 37 57 42 34 58 33 9 57 34 4 -0.41 -159 0 0 58 3 32 7 36 56.2 13 95 -2 58 24 35 57 42 32 58 33 7 57 34 3 -0.41 -160 0 0 58 3 9 7 36 57.5 12 94 -1 58 24 12 57 42 9 58 32 44 57 33 40 -0.41 -161 0 0 58 2 25 7 36 58.8 11 93 -1 58 23 28 57 41 24 58 32 0 57 32 55 -0.41 -162 0 0 58 1 20 7 37 0.0 11 92 -1 58 22 23 57 40 19 58 30 56 57 31 50 -0.41 -163 0 0 57 59 54 7 37 1.2 10 91 0 58 20 58 57 38 53 58 29 30 57 30 23 -0.41 -164 0 0 57 58 6 7 37 2.3 10 90 0 58 19 11 57 37 5 58 27 44 57 28 35 -0.41 -165 0 0 57 55 58 7 37 3.3 9 90 0 58 17 4 57 34 55 58 25 37 57 26 25 -0.41 -166 0 0 57 53 28 7 37 4.3 9 89 1 58 14 35 57 32 25 58 23 8 57 23 54 -0.41 -167 0 0 57 50 37 7 37 5.3 8 88 1 58 11 45 57 29 32 58 20 19 57 21 1 -0.41 -168 0 0 57 47 24 7 37 6.2 8 87 2 58 8 33 57 26 18 58 17 8 57 17 47 -0.41 -169 0 0 57 43 50 7 37 7.0 7 86 2 58 5 0 57 22 43 58 13 35 57 14 11 -0.41 -170 0 0 57 39 54 7 37 7.8 7 85 2 58 1 6 57 18 45 58 9 42 57 10 12 -0.42 -171 0 0 57 35 36 7 37 8.5 6 85 3 57 56 50 57 14 25 58 5 26 57 5 52 -0.42 -172 0 0 57 30 56 7 37 9.2 6 84 3 57 52 11 57 9 43 58 0 49 57 1 9 -0.42 -173 0 0 57 25 53 7 37 9.8 5 83 3 57 47 11 57 4 39 57 55 49 56 56 4 -0.42 -174 0 0 57 20 29 7 37 10.3 5 82 4 57 41 49 56 59 12 57 50 27 56 50 36 -0.43 -175 0 0 57 14 41 7 37 10.8 4 81 4 57 36 4 56 53 22 57 44 43 56 44 45 -0.43 -176 0 0 57 8 31 7 37 11.2 3 80 4 57 29 56 56 47 9 57 38 37 56 38 32 -0.44 -177 0 0 57 1 58 7 37 11.6 3 80 5 57 23 25 56 40 33 57 32 7 56 31 55 -0.45 -178 0 0 56 55 1 7 37 11.9 2 79 5 57 16 32 56 33 34 57 25 15 56 24 54 -0.47 -179 0 0 56 47 41 7 37 12.1 2 78 6 57 9 14 56 26 11 57 17 59 56 17 30 -0.49 -180 0 0 56 39 57 7 37 12.3 1 77 6 57 1 34 56 18 24 57 10 19 56 9 42 -0.55 179 0 0 56 31 49 7 37 12.4 1 76 6 56 53 29 56 10 13 57 2 16 56 1 29 -0.69 178 0 0 56 23 17 7 37 12.5 0 75 7 56 45 0 .. .. .. 56 53 48 .. .. .. -3.86 Uncertainty in time = +/- 2 secs Prediction of 2022 Apr 15.8 Data for the target star ------------------------ * name: UCAC4 491-100544 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 08 02.8387 DE: +08 06 51.927 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 08 02.8388 DE: +08 06 51.927 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.9 * B mag [mag]: 13.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1796) Riga asteroid class: approx. diameter [km]: 73 approx. diameter ["]: 0.040 distance from Earth [AU]: 2.47870 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 date of fit: 2022 Apr 14 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): 0.014", 0.005", 93.985° remarks: * orbital elements for (1796)Riga : Mean anomaly = 59.2277331326 deg Arg. of pericenter = 26.4573241215 deg Long. of node = 186.7042297059 deg Inclination = 22.5883338142 deg Eccentricity = 0.0554924849 Semimajor axis = 3.3538961430 AU Perihelion dist = 3.1677801119 AU Mag: H = 9.93, G = 0.15 Epoch of elements : MJD 59734.31074196 TDT (2022 Jun 04.3107) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532022Apr14,7.16,2022,6,4,7.457789,0.213505,0.299958,-4.654548,3.311406,-0.002998,-0.002772,0.000001,0.000000 -77.3059,8.1483,67.72,22.44,False UCAC4 491-100544,19.13412187,8.1144241,13.75,12.92,12.47,0.0,0,,19.15223069,8.1483199,2.42,2.42,0,0,0 1796,Riga,15.22,72.5,2.4787,0,0,-1.112,11.75,,4.0 0,59.1779,2022,6,4,26.4573,186.7042,22.5883,0.05549,3.35390,3.16778,9.92,5.0,0.15 1.202,0.0137,0.0047,94,0.0082,Known errors,-1.00,-1,-1,-1 20220604_100544,59684.83 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Apr 15, 20:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org