IOTA/IOTA-ES occultation update for (202) Chryseis / UCAC4 380-086683 event on 2023 Mar 22, 08:39 UT Visible from South America Summary ------- On 2023 Mar 22 UT, the 88.3 km diameter asteroid (202) Chryseis will occult a 11.8 mag star in the constellation Serpens for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.77 mag to 13.32 mag (the magnitude of the asteroid) for at most 7.240 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 22, 08:30 - 2023 Mar 22, 08:47 * geocentric midpoint of event [JD]: 2460025.86034495 * magnitude of target star: 11.79 * magnitude drop [mag]: 1.77 * estimated maximum duration [s]: 7.240 * Moon: 1 % sunlit, 107° distance * Sun: 97° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 89 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.001", 99°) * approx speed of asteroid's shadow [km/s]: 12.1893 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 380-086683 by 202 Chryseis on 2023 Mar 22 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 -134 0 0 - 6 18 59 8 30 13.6 1 104 -80 - 6 43 47 - 5 54 10 - 6 53 10 - 5 44 46 .... -133 0 0 - 6 33 54 8 30 13.8 2 104 -81 - 6 58 40 - 6 9 6 - 7 8 3 - 5 59 42 -0.01 -132 0 0 - 6 48 34 8 30 14.1 3 104 -81 - 7 13 19 - 6 23 47 - 7 22 41 - 6 14 24 -0.05 -131 0 0 - 7 2 59 8 30 14.6 4 104 -82 - 7 27 42 - 6 38 14 - 7 37 4 - 6 28 51 -0.06 -130 0 0 - 7 17 8 8 30 15.3 5 104 -82 - 7 41 51 - 6 52 25 - 7 51 12 - 6 43 3 -0.07 -129 0 0 - 7 31 3 8 30 16.2 6 104 -82 - 7 55 44 - 7 6 21 - 8 5 4 - 6 56 59 -0.07 -128 0 0 - 7 44 41 8 30 17.2 7 103 -83 - 8 9 21 - 7 20 1 - 8 18 41 - 7 10 39 -0.08 -127 0 0 - 7 58 4 8 30 18.4 8 103 -83 - 8 22 42 - 7 33 25 - 8 32 2 - 7 24 4 -0.08 -126 0 0 - 8 11 10 8 30 19.7 9 103 -82 - 8 35 47 - 7 46 32 - 8 45 6 - 7 37 12 -0.08 -125 0 0 - 8 24 1 8 30 21.2 10 103 -82 - 8 48 36 - 7 59 24 - 8 57 55 - 7 50 4 -0.09 -124 0 0 - 8 36 34 8 30 22.9 11 103 -82 - 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Uncertainty in time = +/- 4 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 380-086683 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 35 10.3131 DE: -14 04 34.986 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 35 10.3132 DE: -14 04 34.986 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (202) Chryseis asteroid class: approx. diameter [km]: 88 approx. diameter ["]: 0.043 distance from Earth [AU]: 2.85820 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): 0.022", 0.001", 98.516° remarks: * orbital elements for (202)Chryseis : Mean anomaly = 97.1208015940 deg Arg. of pericenter = 359.7352532841 deg Long. of node = 136.7126017227 deg Inclination = 8.8500698075 deg Eccentricity = 0.1042527449 Semimajor axis = 3.0700486370 AU Perihelion dist = 2.7499876396 AU Mag: H = 7.60, G = 0.15 Epoch of elements : MJD 60025.36041667 TDT (2023 Mar 22.3604) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#972023Feb07,7.24,2023,3,22,8.648279,-0.022653,0.103181,6.719773,1.476029,-0.005865,0.000123,0.000000,0.000000 -45.1995,-14.0931,52.02,0.58,False UCAC4 380-086683,17.58619807,-14.0763851,0.00,11.79,0.00,0.0,0,,17.60803273,-14.0930583,1.77,0.00,0,0,0 202,Chryseis,13.32,88.3,2.8582,0,0,1.421,4.54,,4.4,0 0,97.0548,2023,3,22,359.7353,136.7126,8.8501,0.10425,3.07005,2.74999,7.61,5.0,0.15 1.189,0.0223,0.0013,99,0.0081,Known errors,-1.00,-1,-1,-1 20230322_086683,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org