IOTA/IOTA-ES occultation update for (202) Chryseis / UCAC4 381-088636 event on 2023 Mar 30, 13:36 UT Visible from New Zealand, Australia Summary ------- On 2023 Mar 30 UT, the 88.3 km diameter asteroid (202) Chryseis will occult a 12.2 mag star in the constellation Serpens for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.37 mag to 13.23 mag (the magnitude of the asteroid) for at most 10.140 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 Mar 30, 13:24 - 2023 Mar 30, 13:48 * geocentric midpoint of event [JD]: 2460034.06698479 * magnitude of target star: 12.22 * magnitude drop [mag]: 1.37 * estimated maximum duration [s]: 10.140 * Moon: 64 % sunlit, 145° distance * Sun: 104° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 92 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.001", 98°) * approx speed of asteroid's shadow [km/s]: 8.7046 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 381-088636 by 202 Chryseis on 2023 Mar 30 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 137 0 0 -33 44 17 13 24 44.0 0 107 -53 -34 10 22 .. .. .. -34 22 58 .. .. .. .... 138 0 0 -33 59 7 13 24 44.1 1 106 -54 -34 25 9 -33 33 8 -34 37 44 -33 20 37 0.27 139 0 0 -34 13 37 13 24 44.4 2 105 -54 -34 39 37 -33 47 40 -34 52 10 -33 35 11 0.28 140 0 0 -34 27 47 13 24 44.8 3 105 -54 -34 53 45 -34 1 53 -35 6 17 -33 49 25 0.29 141 0 0 -34 41 38 13 24 45.5 4 104 -55 -35 7 33 -34 15 47 -35 20 4 -34 3 20 0.29 142 0 0 -34 55 9 13 24 46.3 4 104 -55 -35 21 1 -34 29 20 -35 33 31 -34 16 54 0.29 143 0 0 -35 8 20 13 24 47.2 5 103 -55 -35 34 10 -34 42 34 -35 46 39 -34 30 9 0.29 144 0 0 -35 21 12 13 24 48.4 6 103 -55 -35 46 59 -34 55 28 -35 59 26 -34 43 4 0.29 145 0 0 -35 33 43 13 24 49.6 7 102 -55 -35 59 28 -35 8 1 -36 11 54 -34 55 39 0.29 146 0 0 -35 45 54 13 24 51.1 8 101 -56 -36 11 36 -35 20 15 -36 24 2 -35 7 54 0.29 147 0 0 -35 57 45 13 24 52.7 9 101 -56 -36 23 25 -35 32 8 -36 35 49 -35 19 48 0.29 148 0 0 -36 9 16 13 24 54.5 9 100 -56 -36 34 54 -35 43 42 -36 47 16 -35 31 23 0.29 149 0 0 -36 20 27 13 24 56.4 10 100 -56 -36 46 2 -35 54 55 -36 58 24 -35 42 37 0.29 150 0 0 -36 31 17 13 24 58.5 11 99 -56 -36 56 50 -36 5 47 -37 9 11 -35 53 31 0.29 151 0 0 -36 41 47 13 25 0.7 12 98 -56 -37 7 18 -36 16 20 -37 19 37 -36 4 4 0.29 152 0 0 -36 51 57 13 25 3.0 13 98 -56 -37 17 25 -36 26 31 -37 29 44 -36 14 17 0.29 153 0 0 -37 1 46 13 25 5.6 14 97 -56 -37 27 12 -36 36 23 -37 39 30 -36 24 9 0.29 154 0 0 -37 11 15 13 25 8.2 14 97 -56 -37 36 39 -36 45 54 -37 48 55 -36 33 41 0.29 155 0 0 -37 20 23 13 25 11.0 15 96 -56 -37 45 45 -36 55 4 -37 58 1 -36 42 53 0.29 156 0 0 -37 29 11 13 25 14.0 16 95 -56 -37 54 31 -37 3 54 -38 6 46 -36 51 43 0.29 157 0 0 -37 37 38 13 25 17.1 17 95 -56 -38 2 56 -37 12 23 -38 15 10 -37 0 13 0.29 158 0 0 -37 45 45 13 25 20.3 18 94 -56 -38 11 1 -37 20 32 -38 23 14 -37 8 23 0.29 159 0 0 -37 53 31 13 25 23.7 19 93 -56 -38 18 46 -37 28 20 -38 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46 32.4 29 258 46 - 7 6 6 - 6 12 2 - 7 19 11 - 5 59 2 0.31 - 67 0 0 - 6 14 47 13 46 39.5 28 258 47 - 6 41 49 - 5 47 50 - 6 54 52 - 5 34 51 0.31 - 66 0 0 - 5 50 48 13 46 46.3 27 257 48 - 6 17 47 - 5 23 53 - 6 30 50 - 5 10 56 0.32 - 65 0 0 - 5 27 5 13 46 52.9 26 257 50 - 5 54 2 - 5 0 13 - 6 7 3 - 4 47 17 0.32 - 64 0 0 - 5 3 39 13 46 59.2 25 257 51 - 5 30 33 - 4 36 49 - 5 43 32 - 4 23 54 0.32 - 63 0 0 - 4 40 30 13 47 5.2 24 257 52 - 5 7 21 - 4 13 43 - 5 20 19 - 4 0 49 0.32 - 62 0 0 - 4 17 38 13 47 11.0 23 257 53 - 4 44 27 - 3 50 54 - 4 57 24 - 3 38 2 0.32 - 61 0 0 - 3 55 5 13 47 16.6 22 257 54 - 4 21 50 - 3 28 24 - 4 34 46 - 3 15 33 0.32 - 60 0 0 - 3 32 50 13 47 21.8 21 257 55 - 3 59 33 - 3 6 12 - 4 12 27 - 2 53 22 0.32 - 59 0 0 - 3 10 55 13 47 26.8 20 256 56 - 3 37 34 - 2 44 19 - 3 50 27 - 2 31 31 0.32 - 58 0 0 - 2 49 18 13 47 31.5 19 256 57 - 3 15 55 - 2 22 45 - 3 28 47 - 2 9 58 0.32 - 57 0 0 - 2 28 1 13 47 36.0 18 256 58 - 2 54 35 - 2 1 31 - 3 7 26 - 1 48 46 0.32 - 56 0 0 - 2 7 5 13 47 40.2 17 256 59 - 2 33 36 - 1 40 38 - 2 46 25 - 1 27 54 0.32 - 55 0 0 - 1 46 29 13 47 44.1 15 256 60 - 2 12 57 - 1 20 5 - 2 25 44 - 1 7 22 0.32 - 54 0 0 - 1 26 14 13 47 47.8 14 256 61 - 1 52 39 - 0 59 52 - 2 5 25 - 0 47 11 0.32 - 53 0 0 - 1 6 19 13 47 51.2 13 256 62 - 1 32 42 - 0 40 1 - 1 45 27 - 0 27 21 0.32 - 52 0 0 - 0 46 47 13 47 54.3 12 256 63 - 1 13 6 - 0 20 31 - 1 25 50 - 0 7 52 0.33 - 51 0 0 - 0 27 36 13 47 57.2 11 256 65 - 0 53 52 - 0 1 23 - 1 6 34 0 11 14 0.33 - 50 0 0 - 0 8 47 13 47 59.8 10 256 66 - 0 35 0 0 17 23 - 0 47 41 0 29 59 0.33 - 49 0 0 0 9 40 13 48 2.2 9 256 67 - 0 16 31 0 35 47 - 0 29 10 0 48 22 0.33 - 48 0 0 0 27 45 13 48 4.3 8 256 68 0 1 36 0 53 49 - 0 11 1 1 6 22 0.34 - 47 0 0 0 45 26 13 48 6.1 7 256 69 0 19 21 1 11 28 0 6 45 1 24 0 0.34 - 46 0 0 1 2 45 13 48 7.7 6 256 70 0 36 43 1 28 44 0 24 7 1 41 15 0.35 - 45 0 0 1 19 41 13 48 9.0 5 256 71 0 53 41 1 45 37 0 41 7 1 58 6 0.35 - 44 0 0 1 36 14 13 48 10.1 4 256 72 1 10 16 2 2 7 0 57 44 2 14 35 0.37 - 43 0 0 1 52 23 13 48 10.9 3 256 73 1 26 28 2 18 14 1 13 57 2 30 40 0.39 - 42 0 0 2 8 8 13 48 11.4 2 256 74 1 42 17 2 33 57 1 29 47 2 46 22 0.44 - 41 0 0 2 23 30 13 48 11.7 1 256 75 1 57 41 2 49 16 1 45 13 3 1 40 0.62 Uncertainty in time = +/- 5 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 381-088636 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 39 11.4097 DE: -13 48 56.621 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 39 11.4097 DE: -13 48 56.621 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (202) Chryseis asteroid class: approx. diameter [km]: 88 approx. diameter ["]: 0.044 distance from Earth [AU]: 2.75240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#97 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): 0.023", 0.001", 98.356° remarks: * orbital elements for (202)Chryseis : Mean anomaly = 98.6274225643 deg Arg. of pericenter = 359.7322097812 deg Long. of node = 136.7122740642 deg Inclination = 8.8500873225 deg Eccentricity = 0.1042582639 Semimajor axis = 3.0700279957 AU Perihelion dist = 2.7499522068 AU Mag: H = 7.60, G = 0.15 Epoch of elements : MJD 60033.56715278 TDT (2023 Mar 30.5672) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#972023Feb07,10.14,2023,3,30,13.607635,0.088381,-0.261285,4.655233,1.570906,-0.005656,-0.000054,0.000000,0.000000 -126.6736,-13.8302,-22.98,3.80,False UCAC4 381-088636,17.65316934,-13.8157281,0.00,12.22,0.00,0.0,0,,17.67503587,-13.8301524,1.37,0.00,0,0,0 202,Chryseis,13.23,88.3,2.7524,0,0,1.021,5.02,,4.4,0 0,98.5235,2023,3,30,359.7322,136.7123,8.8501,0.10426,3.07003,2.74995,7.61,5.0,0.15 1.241,0.0233,0.0014,98,0.0107,Known errors,-1.00,-1,-1,-1 20230330_088636,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org