IOTA/IOTA-ES occultation update for (209) Dido / UCAC4 308-268579 event on 2023 Apr 28, 05:15 UT Visible from South America Summary ------- On 2023 Apr 28 UT, the 147.4 km diameter asteroid (209) Dido will occult a 12.1 mag star in the constellation Sagittarius 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 1.87 mag to 13.80 mag (the magnitude of the asteroid) for at most 11.990 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 Apr 28, 05:07 - 2023 Apr 28, 05:24 * geocentric midpoint of event [JD]: 2460062.71936883 * magnitude of target star: 12.14 * magnitude drop [mag]: 1.87 * estimated maximum duration [s]: 11.990 * Moon: 53 % sunlit, 167° distance * Sun: 100° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 148 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.004", 74°) * approx speed of asteroid's shadow [km/s]: 12.2912 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 308-268579 by 209 Dido on 2023 Apr 28 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 - 78 0 0 4 27 56 5 7 16.4 0 119 -71 3 42 24 5 13 31 3 31 53 .. .. .. .... - 77 0 0 3 55 11 5 7 16.5 2 119 -72 3 9 38 4 40 46 2 59 7 4 51 18 0.08 - 76 0 0 3 22 23 5 7 16.9 3 119 -73 2 36 50 4 7 59 2 26 18 4 18 31 0.03 - 75 0 0 2 49 34 5 7 17.5 4 119 -73 2 4 0 3 35 9 1 53 29 3 45 41 0.01 - 74 0 0 2 16 43 5 7 18.3 5 119 -73 1 31 9 3 2 18 1 20 38 3 12 50 -0.01 - 73 0 0 1 43 53 5 7 19.3 6 119 -74 0 58 19 2 29 27 0 47 48 2 40 0 -0.01 - 72 0 0 1 11 3 5 7 20.5 7 119 -74 0 25 31 1 56 37 0 15 0 2 7 9 -0.02 - 71 0 0 0 38 16 5 7 21.9 8 119 -74 - 0 7 16 1 23 49 - 0 17 47 1 34 21 -0.02 - 70 0 0 0 5 31 5 7 23.5 9 119 -74 - 0 39 59 0 51 4 - 0 50 30 1 1 35 -0.02 - 69 0 0 - 0 27 9 5 7 25.3 11 119 -74 - 1 12 38 0 18 22 - 1 23 8 0 28 53 -0.03 - 68 0 0 - 0 59 44 5 7 27.3 12 119 -74 - 1 45 12 - 0 14 15 - 1 55 41 - 0 3 44 -0.03 - 67 0 0 - 1 32 14 5 7 29.5 13 119 -74 - 2 17 39 - 0 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Uncertainty in time = +/- 4 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: UCAC4 308-268579 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 06 12.9795 DE: -28 28 33.424 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 06 12.9800 DE: -28 28 33.423 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (209) Dido asteroid class: approx. diameter [km]: 147 approx. diameter ["]: 0.077 distance from Earth [AU]: 2.65400 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#118 date of fit: 2022 Nov 25 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): 0.026", 0.004", 73.57° remarks: * orbital elements for (209)Dido : Mean anomaly = 24.8250702098 deg Arg. of pericenter = 249.8097540924 deg Long. of node = 0.6348752224 deg Inclination = 7.1699594855 deg Eccentricity = 0.0550731428 Semimajor axis = 3.1465683932 AU Perihelion dist = 2.9732769827 AU Mag: H = 8.29, G = 0.15 Epoch of elements : MJD 60062.21923611 TDT (2023 Apr 28.2192) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182022Nov25,11.99,2023,4,28,5.264852,0.000397,0.061808,6.934453,-0.206322,-0.005531,-0.001063,0.000000,0.000000 7.0125,-28.4091,100.43,14.07,False UCAC4 308-268579,20.10360540,-28.4759512,0.00,12.14,0.00,0.0,0,,20.12739421,-28.4091424,1.87,0.00,0,0,0 209,Dido,13.80,147.4,2.6540,0,0,1.742,-0.68,,8.2,0 0,24.7864,2023,4,28,249.8098,0.6349,7.1700,0.05507,3.14657,2.97328,8.32,5.0,0.15 1.115,0.0257,0.0040,74,0.0088,Known errors,-1.00,-1,-1,-1 20230428_268579,60004.06 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org