IOTA/IOTA-ES occultation update for (568) Cheruskia / TYC 1181-01068-1 event on 2023 May 20, 09:06 UT Visible from USA, E Canada Summary ------- On 2023 May 20 UT, the 80.6 km diameter asteroid (568) Cheruskia will occult a 10.4 mag star in the constellation Pegasus for observers along a path across USA, E Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.68 mag to 15.07 mag (the magnitude of the asteroid) for at most 2.120 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 May 20, 09:05 - 2023 May 20, 09:08 * geocentric midpoint of event [JD]: 2460084.87955058 * magnitude of target star: 10.40 * magnitude drop [mag]: 4.68 * estimated maximum duration [s]: 2.120 * Moon: 1 % sunlit, 59° distance * Sun: 51° distance * rough path description: USA, E Canada The occultation path -------------------- * approximate projected width [km]: 157 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.003", 75°) * approx speed of asteroid's shadow [km/s]: 38.0988 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1181-01068-1 by 568 Cheruskia on 2023 May 20 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 Alt E. Longitude Latitude U.T. Alt Az Alt Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude .. .. .. .. .. .. .. .. .... .. .. .. -109 16 34 29 12 33 ... .. .. .. .. .. -107 19 25 29 44 26 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. -106 5 49 30 26 2 ... .. .. .. .. .. -105 5 15 30 39 29 ... .. .. .. .. .. .... -108 51 48 30 7 38 9 5 8.0 2 71 -33 -104 17 20 31 12 46 ... .. .. .. .. .. -103 30 15 31 21 46 ... .. .. .. .. .. .... -106 6 58 31 12 51 9 5 8.9 5 72 -31 -102 52 52 31 51 39 ... .. .. .. .. .. -102 12 37 31 58 24 ... .. .. .. .. .. -1.29 -104 23 43 31 58 0 9 5 9.9 7 73 -29 -101 41 23 32 26 17 -108 49 24 30 55 53 -101 5 26 32 31 36 ... .. .. .. .. .. -1.52 -103 1 59 32 36 7 9 5 10.8 8 74 -28 -100 38 21 32 58 10 -106 16 7 31 57 29 -100 5 24 33 2 28 -107 26 47 31 40 49 -1.59 -101 52 19 33 10 17 9 5 11.8 9 75 -27 - 99 41 23 33 28 4 -104 36 3 32 41 44 - 99 10 41 33 31 36 -105 28 27 32 31 4 -1.62 -100 50 39 33 41 51 9 5 12.7 10 75 -26 - 98 49 2 33 56 27 -103 16 7 33 19 24 - 98 20 5 33 59 23 -104 0 10 33 11 30 -1.64 - 99 54 46 34 11 31 9 5 13.7 11 76 -25 - 98 0 21 34 23 38 -102 7 44 33 53 17 - 97 32 49 34 26 4 -102 46 44 33 47 5 -1.65 - 99 3 20 34 39 44 9 5 14.6 12 76 -25 - 97 14 41 34 49 50 -101 7 3 34 24 39 - 96 48 20 34 51 51 -101 42 36 34 19 37 -1.66 - 98 15 27 35 6 47 9 5 15.6 12 77 -24 - 96 31 33 35 15 13 -100 11 59 34 54 11 - 96 6 11 35 16 52 -100 45 0 34 50 1 -1.67 - 97 30 29 35 32 53 9 5 16.5 13 77 -23 - 95 50 34 35 39 53 - 99 21 16 35 22 18 - 95 26 3 35 41 14 - 99 52 18 35 18 48 -1.67 - 96 47 59 35 58 11 9 5 17.5 14 78 -22 - 95 11 27 36 3 57 - 98 34 0 35 49 17 - 94 47 40 36 5 1 - 99 3 29 35 46 20 -1.68 - 96 7 35 36 22 48 9 5 18.4 14 78 -22 - 94 33 59 36 27 28 - 97 49 37 36 15 20 - 94 10 49 36 28 19 - 98 17 48 36 12 50 -1.68 - 95 29 1 36 46 49 9 5 19.4 15 79 -21 - 93 57 58 36 50 32 - 97 7 39 36 40 36 - 93 35 22 36 51 10 - 97 34 45 36 38 30 -1.68 - 94 52 3 37 10 19 9 5 20.3 15 79 -20 - 93 23 14 37 13 10 - 96 27 44 37 5 11 - 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62 1 33 83 52 47 - 85 22 0 84 38 28 1.72 - 74 45 3 84 47 39 9 7 36.0 20 115 17 - 65 13 52 84 26 33 - 85 49 19 84 59 49 - 63 1 37 84 19 57 - 88 54 12 85 1 10 1.72 - 77 24 44 85 13 20 9 7 36.9 20 113 17 - 66 44 51 84 53 45 - 89 45 36 85 22 23 - 64 17 16 84 47 20 - 93 9 33 85 22 38 1.72 - 80 44 1 85 38 31 9 7 37.9 19 110 17 - 68 40 6 85 21 2 - 94 32 39 85 43 31 - 65 53 32 85 14 54 - 98 16 42 85 42 23 1.72 - 84 55 12 86 2 51 9 7 38.8 19 106 17 - 71 8 7 85 48 16 -100 20 43 86 2 34 - 67 57 39 85 42 33 -104 23 58 85 59 41 1.72 - 90 14 20 86 25 48 9 7 39.8 18 100 17 - 74 21 21 86 15 15 -107 18 36 86 18 41 - 70 40 21 86 10 9 -111 36 46 86 13 41 1.72 - 97 0 51 86 46 32 9 7 40.7 18 94 17 - 78 38 26 86 41 37 -115 29 30 86 30 50 - 74 17 59 86 37 25 -119 53 16 86 23 21 1.72 -105 34 3 87 3 53 9 7 41.7 17 85 17 - 84 27 14 87 6 47 -124 45 6 86 37 49 - 79 15 59 87 3 55 -129 0 18 86 27 37 1.72 -116 2 37 87 16 16 9 7 42.6 17 75 17 - 92 27 31 87 29 43 -134 41 17 86 38 35 - 86 13 48 87 28 52 -138 30 29 86 25 38 1.72 -128 7 28 87 21 58 9 7 43.6 16 63 17 -103 27 26 87 48 43 -144 39 48 86 32 30 - 96 8 16 87 50 50 -147 50 10 86 17 0 1.72 -140 51 6 87 19 33 9 7 44.5 16 50 17 -117 55 11 88 1 8 -154 2 25 86 19 27 -109 59 42 88 7 22 -156 28 28 86 1 44 1.72 -152 54 56 87 8 39 9 7 45.5 15 38 17 -134 53 35 88 4 2 -162 22 3 85 59 51 -127 43 44 88 14 59 -164 6 3 85 40 17 1.73 -163 21 26 86 49 57 9 7 46.4 15 28 17 -151 37 16 87 55 50 -169 27 53 85 34 19 -146 38 19 88 10 50 -170 36 32 85 13 10 1.73 -171 51 18 86 24 37 9 7 47.4 14 20 17 -165 31 20 87 37 34 -175 21 35 85 3 29 -162 53 1 87 55 10 -176 2 47 84 40 54 1.74 -178 33 8 85 53 48 9 7 48.3 14 13 17 -175 56 57 87 11 32 179 48 39 84 27 48 -174 56 48 87 30 36 179 27 49 84 3 47 1.74 176 13 55 85 18 18 9 7 49.3 13 8 17 176 31 6 86 39 50 175 52 50 83 47 27 176 34 48 86 59 49 175 46 43 83 21 53 1.75 172 10 34 84 38 36 9 7 50.2 12 4 16 171 5 9 86 3 47 172 41 29 83 2 20 170 38 46 86 24 29 172 45 52 82 34 55 1.75 169 0 54 83 54 46 9 7 51.2 11 1 16 167 7 25 85 24 0 170 6 38 82 12 0 166 25 35 85 45 29 170 18 30 81 42 15 1.76 166 32 53 83 6 37 9 7 52.1 11 358 16 164 11 54 84 40 45 168 1 58 81 15 32 163 22 30 85 3 10 168 19 13 80 42 38 1.77 164 37 42 82 13 34 9 7 53.1 10 357 16 162 1 19 83 53 56 166 22 47 80 11 10 161 8 35 84 17 30 166 44 7 79 33 39 1.79 163 9 7 81 14 33 9 7 54.0 9 355 15 160 24 17 83 3 8 165 6 0 78 55 33 159 30 26 83 28 12 165 30 50 78 10 19 1.81 162 2 57 80 7 41 9 7 55.0 8 354 15 159 13 15 82 7 39 164 10 41 77 20 47 158 19 23 82 34 41 164 40 1 76 18 41 1.84 161 17 0 78 49 18 9 7 55.9 6 353 14 158 23 20 81 6 15 163 42 33 74 56 18 157 29 52 81 35 58 ... .. .. .. .. .. 1.90 160 51 57 77 10 44 9 7 56.9 5 353 13 157 51 43 79 56 48 ... .. .. .. .. .. 156 58 30 80 30 25 ... .. .. .. .. .. 2.02 160 59 52 74 35 18 9 7 57.8 2 353 12 157 37 40 78 35 12 ... .. .. .. .. .. 156 43 51 79 15 4 ... .. .. .. .. .. -2.77 .. .. .. .. .. .. .. .. .... .. .. .. 157 44 16 76 51 21 ... .. .. .. .. .. 156 47 9 77 43 36 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. 158 36 3 73 52 56 ... .. .. .. .. .. 157 17 20 75 36 13 ... .. .. .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Mar 30.0 Data for the target star ------------------------ * name: TYC 1181-01068-1 * constellation : Pegasus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 10 36.1416 DE: +17 31 15.078 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 10 36.1419 DE: +17 31 15.079 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.4 * B mag [mag]: 10.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (568) Cheruskia asteroid class: approx. diameter [km]: 81 approx. diameter ["]: 0.035 distance from Earth [AU]: 3.18170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#90 date of fit: 2023 Feb 07 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): 0.016", 0.003", 74.599° remarks: * orbital elements for (568)Cheruskia : Mean anomaly = 305.4731914704 deg Arg. of pericenter = 173.7449945111 deg Long. of node = 249.7539953652 deg Inclination = 18.3960073310 deg Eccentricity = 0.1688005471 Semimajor axis = 2.8818635914 AU Perihelion dist = 2.3954034404 AU Mag: H = 9.50, G = 0.15 Epoch of elements : MJD 60084.37955833 TDT (2023 May 20.3796) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#902023Feb07,2.12,2023,5,20,9.109214,-0.410726,0.754032,18.890860,10.274186,-0.004253,-0.000886,-0.000001,-0.000001 -11.4602,17.6473,42.50,19.96,False TYC 1181-01068-1,0.17670596,17.5208549,10.70,10.40,10.24,0.0,0,,0.19638554,17.6472981,4.68,4.40,0,0,0 568,Cheruskia,15.07,80.6,3.1817,0,0,3.654,28.40,,4.0,0 0,305.3967,2023,5,20,173.7450,249.7540,18.3960,0.16880,2.88186,2.39540,9.52,5.0,0.15 1.130,0.0160,0.0028,75,0.0045,Known errors,-1.00,-1,-1,-1 20230520_1068-1,60032.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 29, 23:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org