IOTA/IOTA-ES occultation update for (202) Chryseis / UCAC4 390-076168 event on 2023 May 27, 13:36 UT Visible from Australia Summary ------- On 2023 May 27 UT, the 88.3 km diameter asteroid (202) Chryseis will occult a 11.9 mag star in the constellation Serpens for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.01 mag to 12.35 mag (the magnitude of the asteroid) for at most 7.230 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: 100 * date and approx. time of event: 2023 May 27, 13:28 - 2023 May 27, 13:45 * geocentric midpoint of event [JD]: 2460092.06728633 * magnitude of target star: 11.89 * magnitude drop [mag]: 1.01 * estimated maximum duration [s]: 7.230 * Moon: 50 % sunlit, 105° distance * Sun: 161° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 90 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.002", 99°) * approx speed of asteroid's shadow [km/s]: 12.2188 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 390-076168 by 202 Chryseis on 2023 May 27 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 79 0 0 .. .. .... .. .. .. .. .. .. .. .. .. - 9 13 31 .. .. .. - 9 16 34 .... 80 0 0 - 9 1 30 13 45 23.4 1 102 -19 - 8 36 29 - 9 26 34 - 8 33 26 - 9 29 38 .... 81 0 0 - 9 14 37 13 45 23.2 2 102 -20 - 8 49 35 - 9 39 41 - 8 46 32 - 9 42 45 0.20 82 0 0 - 9 27 46 13 45 22.8 3 102 -21 - 9 2 44 - 9 52 50 - 8 59 41 - 9 55 54 0.20 83 0 0 - 9 40 57 13 45 22.2 4 102 -22 - 9 15 55 -10 6 2 - 9 12 52 -10 9 6 0.20 84 0 0 - 9 54 11 13 45 21.5 5 102 -23 - 9 29 9 -10 19 16 - 9 26 6 -10 22 20 0.20 85 0 0 -10 7 27 13 45 20.6 6 101 -24 - 9 42 24 -10 32 32 - 9 39 21 -10 35 36 0.20 86 0 0 -10 20 45 13 45 19.5 7 101 -25 - 9 55 42 -10 45 50 - 9 52 39 -10 48 54 0.20 87 0 0 -10 34 4 13 45 18.3 8 101 -26 -10 9 1 -10 59 9 -10 5 57 -11 2 13 0.20 88 0 0 -10 47 24 13 45 16.9 9 101 -27 -10 22 21 -11 12 30 -10 19 17 -11 15 33 0.21 89 0 0 -11 0 45 13 45 15.3 10 101 -28 -10 35 42 -11 25 51 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22 264 -8 -19 12 34 -20 2 19 -19 9 32 -20 5 22 0.22 -113 0 0 -19 26 48 13 28 58.2 21 264 -7 -19 1 56 -19 51 43 -18 58 55 -19 54 45 0.22 -112 0 0 -19 16 3 13 28 55.1 20 264 -6 -18 51 10 -19 40 58 -18 48 8 -19 44 0 0.22 -111 0 0 -19 5 9 13 28 52.2 19 263 -5 -18 40 16 -19 30 5 -18 37 14 -19 33 7 0.22 -110 0 0 -18 54 7 13 28 49.3 18 263 -4 -18 29 13 -19 19 3 -18 26 11 -19 22 6 0.22 -109 0 0 -18 42 57 13 28 46.7 17 263 -3 -18 18 2 -19 7 54 -18 15 0 -19 10 56 0.22 -108 0 0 -18 31 39 13 28 44.1 16 262 -2 -18 6 44 -18 56 36 -18 3 42 -18 59 39 0.22 -107 0 0 -18 20 13 13 28 41.7 15 262 -1 -17 55 17 -18 45 11 -17 52 15 -18 48 14 0.22 -106 0 0 -18 8 40 13 28 39.5 14 262 0 -17 43 44 -18 33 38 -17 40 42 -18 36 41 0.22 -105 0 0 -17 56 59 13 28 37.3 13 261 1 -17 32 3 -18 21 58 -17 29 0 -18 25 1 0.22 -104 0 0 -17 45 12 13 28 35.4 12 261 2 -17 20 14 -18 10 11 -17 17 12 -18 13 14 0.22 -103 0 0 -17 33 17 13 28 33.5 11 261 2 -17 8 19 -17 58 17 -17 5 17 -18 1 20 0.22 -102 0 0 -17 21 16 13 28 31.8 10 260 3 -16 56 17 -17 46 16 -16 53 15 -17 49 19 0.23 -101 0 0 -17 9 8 13 28 30.3 9 260 4 -16 44 9 -17 34 9 -16 41 6 -17 37 12 0.23 -100 0 0 -16 56 53 13 28 28.9 8 260 5 -16 31 54 -17 21 55 -16 28 51 -17 24 58 0.23 - 99 0 0 -16 44 33 13 28 27.7 7 259 6 -16 19 33 -17 9 35 -16 16 30 -17 12 38 0.23 - 98 0 0 -16 32 6 13 28 26.6 6 259 7 -16 7 6 -16 57 9 -16 4 3 -17 0 12 0.24 - 97 0 0 -16 19 34 13 28 25.6 5 259 8 -15 54 33 -16 44 37 -15 51 30 -16 47 40 0.24 - 96 0 0 -16 6 56 13 28 24.8 4 259 9 -15 41 55 -16 31 59 -15 38 52 -16 35 3 0.25 - 95 0 0 -15 54 13 13 28 24.2 3 258 10 -15 29 11 -16 19 16 -15 26 8 -16 22 20 0.26 - 94 0 0 -15 41 24 13 28 23.7 2 258 11 -15 16 22 -16 6 28 -15 13 20 -16 9 32 0.28 - 93 0 0 -15 28 31 13 28 23.4 1 258 12 -15 3 29 -15 53 36 -15 0 26 -15 56 39 0.33 - 92 0 0 -15 15 33 13 28 23.2 0 258 13 -14 50 31 -15 40 38 -14 47 28 -15 43 42 0.58 Uncertainty in time = +/- 4 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 390-076168 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 27 10.5253 DE: -12 08 44.864 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 27 10.5254 DE: -12 08 44.863 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (202) Chryseis asteroid class: approx. diameter [km]: 88 approx. diameter ["]: 0.055 distance from Earth [AU]: 2.23060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#98 date of fit: 2023 Apr 24 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): 0.029", 0.002", 98.855° remarks: * orbital elements for (202)Chryseis : Mean anomaly = 109.2753663982 deg Arg. of pericenter = 359.7119801399 deg Long. of node = 136.7104655820 deg Inclination = 8.8502138534 deg Eccentricity = 0.1042883099 Semimajor axis = 3.0698907342 AU Perihelion dist = 2.7497370178 AU Mag: H = 7.57, G = 0.15 Epoch of elements : MJD 60091.56715278 TDT (2023 May 27.5672) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#982023Apr24,7.23,2023,5,27,13.614872,-0.012232,-0.210598,-6.885726,0.387986,-0.001605,-0.000964,0.000001,0.000000 173.0486,-12.1665,-24.93,21.31,False UCAC4 390-076168,17.45292368,-12.1457955,0.00,11.89,0.00,0.0,0,,17.47494393,-12.1665190,1.01,0.00,0,1,1 202,Chryseis,12.35,88.3,2.2306,0,0,-1.851,1.53,,4.4,0 0,109.1714,2023,5,27,359.7120,136.7105,8.8502,0.10429,3.06989,2.74974,7.61,5.0,0.15 1.061,0.0290,0.0017,99,0.0033,Known errors,-1.00,-1,-1,-1 20230527_076168,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org