IOTA/IOTA-ES occultation update for (202) Chryseis / TYC 5667-00832-1 event on 2023 May 16, 15:38 UT Visible from Australia Summary ------- On 2023 May 16 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 1.13 mag to 12.54 mag (the magnitude of the asteroid) for at most 8.810 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 16, 15:27 - 2023 May 16, 15:48 * geocentric midpoint of event [JD]: 2460081.15161159 * magnitude of target star: 11.89 * magnitude drop [mag]: 1.13 * estimated maximum duration [s]: 8.810 * Moon: 11 % sunlit, 113° distance * Sun: 150° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 92 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.002", 99°) * approx speed of asteroid's shadow [km/s]: 10.0203 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5667-00832-1 by 202 Chryseis on 2023 May 16 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 61 0 0 - 8 16 12 15 48 29.1 0 102 -30 .. .. .. - 8 41 46 .. .. .. - 8 43 23 .... 62 0 0 - 8 29 31 15 48 29.0 1 102 -31 - 8 4 0 - 8 55 5 - 8 2 23 - 8 56 43 0.23 63 0 0 - 8 42 58 15 48 28.6 2 102 -32 - 8 17 26 - 9 8 34 - 8 15 50 - 9 10 11 0.26 64 0 0 - 8 56 35 15 48 28.1 3 102 -33 - 8 31 2 - 9 22 11 - 8 29 25 - 9 23 48 0.27 65 0 0 - 9 10 19 15 48 27.4 4 102 -34 - 8 44 46 - 9 35 56 - 8 43 9 - 9 37 33 0.27 66 0 0 - 9 24 12 15 48 26.4 5 102 -35 - 8 58 38 - 9 49 50 - 8 57 1 - 9 51 27 0.28 67 0 0 - 9 38 13 15 48 25.3 6 102 -36 - 9 12 37 -10 3 51 - 9 11 0 -10 5 28 0.28 68 0 0 - 9 52 21 15 48 23.9 7 101 -37 - 9 26 45 -10 18 0 - 9 25 8 -10 19 37 0.28 69 0 0 -10 6 36 15 48 22.3 8 101 -38 - 9 41 0 -10 32 16 - 9 39 22 -10 33 53 0.28 70 0 0 -10 20 58 15 48 20.6 9 101 -39 - 9 55 21 -10 46 39 - 9 53 44 -10 48 17 0.28 71 0 0 -10 35 27 15 48 18.6 10 101 -40 -10 9 49 -11 1 8 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15 28 9.5 0 257 22 -24 1 0 -24 52 13 -23 59 23 -24 53 51 0.80 Uncertainty in time = +/- 5 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 5667-00832-1 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 34 29.9529 DE: -12 19 15.071 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 34 29.9530 DE: -12 19 15.071 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * 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 ["]: 0.053 distance from Earth [AU]: 2.28010 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): 0.028", 0.002", 98.581° remarks: * orbital elements for (202)Chryseis : Mean anomaly = 107.2704470279 deg Arg. of pericenter = 359.7165894074 deg Long. of node = 136.7107416911 deg Inclination = 8.8501904841 deg Eccentricity = 0.1042829969 Semimajor axis = 3.0699207582 AU Perihelion dist = 2.7497802213 AU Mag: H = 7.57, G = 0.15 Epoch of elements : MJD 60080.65152778 TDT (2023 May 16.6515) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#982023Apr24,8.81,2023,5,16,15.638678,-0.040838,-0.282630,-5.597890,0.806794,-0.002789,-0.000839,0.000001,0.000000 155.2810,-12.3376,-55.48,19.14,False TYC 5667-00832-1,17.57498691,-12.3208532,0.00,11.89,0.00,0.0,0,,17.59697144,-12.3376347,1.12,0.00,0,0,0 202,Chryseis,12.54,88.3,2.2801,0,0,-1.474,3.11,,4.4,0 0,107.1511,2023,5,16,359.7166,136.7107,8.8502,0.10428,3.06992,2.74978,7.61,5.0,0.15 1.032,0.0280,0.0017,99,0.0017,Known errors,-1.00,-1,-1,-1 20230516_0832-1,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org