IOTA/IOTA-ES occultation update for (627) Charis / UCAC4 379-084199 event on 2022 May 26, 19:53 UT Visible from S Australia, Africa Summary ------- On 2022 May 26 UT, the 45.3 km diameter asteroid (627) Charis will occult a 12.4 mag star in the constellation Serpens for observers along a path across S Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.78 mag to 13.97 mag (the magnitude of the asteroid) for at most 4.540 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: 2022 May 26, 19:43 - 2022 May 26, 20:03 * geocentric midpoint of event [JD]: 2459726.32857225 * magnitude of target star: 12.42 * magnitude drop [mag]: 1.78 * estimated maximum duration [s]: 4.540 * Moon: 12 % sunlit, 121° distance * Sun: 160° distance * rough path description: S Australia, Africa The occultation path -------------------- * approximate projected width [km]: 49 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.033, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.033", 0.005", 95°) * approx speed of asteroid's shadow [km/s]: 9.9805 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 379-084199 by 627 Charis on 2022 May 26 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 - 16 0 0 -17 57 33 20 2 55.1 1 105 -20 -17 43 48 -18 11 20 -17 39 44 -18 15 25 .... - 15 0 0 -18 13 1 20 2 54.9 2 104 -21 -17 59 14 -18 26 48 -17 55 11 -18 30 53 0.35 - 14 0 0 -18 28 33 20 2 54.5 3 104 -22 -18 14 46 -18 42 20 -18 10 43 -18 46 25 0.38 - 13 0 0 -18 44 9 20 2 53.9 4 104 -23 -18 30 23 -18 57 57 -18 26 19 -19 2 2 0.39 - 12 0 0 -18 59 50 20 2 53.0 4 104 -24 -18 46 3 -19 13 39 -18 41 59 -19 17 43 0.39 - 11 0 0 -19 15 35 20 2 52.0 5 103 -25 -19 1 47 -19 29 24 -18 57 43 -19 33 28 0.40 - 10 0 0 -19 31 23 20 2 50.8 6 103 -26 -19 17 35 -19 45 12 -19 13 31 -19 49 17 0.40 - 9 0 0 -19 47 14 20 2 49.3 7 103 -27 -19 33 26 -20 1 4 -19 29 22 -20 5 9 0.40 - 8 0 0 -20 3 8 20 2 47.7 8 102 -28 -19 49 20 -20 16 58 -19 45 16 -20 21 3 0.40 - 7 0 0 -20 19 5 20 2 45.9 9 102 -29 -20 5 16 -20 32 55 -20 1 12 -20 37 0 0.40 - 6 0 0 -20 35 3 20 2 43.9 10 101 -30 -20 21 15 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8 -28 3 46 -27 32 3 -28 7 51 0.55 179 0 0 -27 34 44 19 43 20.6 1 255 11 -27 20 55 -27 48 34 -27 16 51 -27 52 39 0.65 180 0 0 -27 19 24 19 43 20.5 0 254 12 -27 5 35 -27 33 15 -27 1 31 -27 37 20 1.20 Uncertainty in time = +/- 4 secs Prediction of 2022 Apr 15.8 Data for the target star ------------------------ * name: UCAC4 379-084199 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 31 22.4618 DE: -14 12 38.318 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 31 22.4618 DE: -14 12 38.318 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (627) Charis asteroid class: approx. diameter [km]: 45 approx. diameter ["]: 0.034 distance from Earth [AU]: 1.84260 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 date of fit: 2022 Apr 12 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): 0.033", 0.005", 94.552° remarks: * orbital elements for (627)Charis : Mean anomaly = 302.0585787977 deg Arg. of pericenter = 177.9116633103 deg Long. of node = 142.4619045030 deg Inclination = 6.4739592372 deg Eccentricity = 0.0586342832 Semimajor axis = 2.8992825343 AU Perihelion dist = 2.7292851811 AU Mag: H = 9.96, G = 0.15 Epoch of elements : MJD 59725.82861111 TDT (2022 May 26.8286) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552022Apr12,4.54,2022,5,26,19.885734,-0.034665,-0.391146,-5.613089,0.476382,-0.001770,-0.000756,0.000001,0.000000 80.5153,-14.2277,-119.01,21.23,False UCAC4 379-084199,17.52290606,-14.2106438,0.00,12.42,0.00,0.0,0,,17.54422241,-14.2276757,1.79,0.00,0,0,1 627,Charis,13.97,45.3,1.8426,0,0,-1.843,2.27,,2.2 0,301.8931,2022,5,26,177.9117,142.4619,6.4740,0.05863,2.89928,2.72929,9.88,5.0,0.15 1.148,0.0330,0.0050,95,0.0050,Known errors,-1.00,-1,-1,-1 20220526_084199,59684.83 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Apr 15, 19:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org