IOTA/IOTA-ES occultation update for (153) Hilda / UCAC4 367-117567 event on 2023 Oct 08, 12:41 UT Visible from S Australia Summary ------- On 2023 Oct 08 UT, the 181.4 km diameter asteroid (153) Hilda will occult a 11.5 mag star in the constellation Sagittarius for observers along a path across S Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.58 mag to 13.96 mag (the magnitude of the asteroid) for at most 7.900 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 Oct 08, 12:36 - 2023 Oct 08, 12:45 * geocentric midpoint of event [JD]: 2460226.02852370 * magnitude of target star: 11.49 * magnitude drop [mag]: 2.58 * estimated maximum duration [s]: 7.900 * Moon: 32 % sunlit, 146° distance * Sun: 79° distance * rough path description: S Australia The occultation path -------------------- * approximate projected width [km]: 199 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 83°) * approx speed of asteroid's shadow [km/s]: 22.9713 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 367-117567 by 153 Hilda on 2023 Oct 8 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 - 29 0 0 .. .. .... .. .. .. .. .. .. -21 45 8 .. .. .. -21 48 39 .. .. .. .... - 28 0 0 -21 6 6 12 36 52.2 1 107 69 -22 3 20 -20 9 20 -22 6 50 -20 5 52 .... - 27 0 0 -21 24 19 12 36 52.3 2 107 69 -22 21 35 -20 27 31 -22 25 6 -20 24 4 0.41 - 26 0 0 -21 42 37 12 36 52.5 3 107 69 -22 39 54 -20 45 47 -22 43 25 -20 42 19 0.43 - 25 0 0 -22 0 57 12 36 52.9 4 106 70 -22 58 16 -21 4 6 -23 1 47 -21 0 38 0.44 - 24 0 0 -22 19 20 12 36 53.3 5 106 70 -23 16 40 -21 22 28 -23 20 12 -21 19 0 0.44 - 23 0 0 -22 37 46 12 36 53.7 6 106 70 -23 35 7 -21 40 52 -23 38 39 -21 37 24 0.45 - 22 0 0 -22 56 14 12 36 54.3 7 105 71 -23 53 36 -21 59 18 -23 57 8 -21 55 50 0.45 - 21 0 0 -23 14 43 12 36 55.0 8 105 71 -24 12 7 -22 17 46 -24 15 38 -22 14 18 0.45 - 20 0 0 -23 33 13 12 36 55.7 9 104 71 -24 30 38 -22 36 16 -24 34 10 -22 32 48 0.45 - 19 0 0 -23 51 44 12 36 56.6 10 104 71 -24 49 10 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39 59 -25 45 35 -27 43 31 -25 42 7 0.90 164 0 0 .. .. .... .. .. .. .. .. .. -27 21 49 .. .. .. -27 25 21 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 367-117567 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 12 59.6000 DE: -16 36 54.024 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 12 59.6000 DE: -16 36 54.024 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (153) Hilda asteroid class: approx. diameter [km]: 181 approx. diameter ["]: 0.071 distance from Earth [AU]: 3.50820 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#66 date of fit: 2023 Aug 22 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): 0.012", 0.001", 83.03° remarks: * orbital elements for (153)Hilda : Mean anomaly = 16.9051855518 deg Arg. of pericenter = 39.4225747771 deg Long. of node = 228.0933526875 deg Inclination = 7.8292663394 deg Eccentricity = 0.1390973570 Semimajor axis = 3.9726355144 AU Perihelion dist = 3.4200524142 AU Mag: H = 7.79, G = 0.15 Epoch of elements : MJD 60225.52854167 TDT (2023 Oct 08.5285) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#662023Aug22,7.90,2023,10,8,12.684569,-0.021732,-0.415172,12.948391,-0.668373,0.005780,0.000278,0.000000,0.000000 66.4287,-16.6090,-13.37,-5.90,False UCAC4 367-117567,18.21655558,-16.6150066,0.00,11.49,0.00,0.0,0,,18.23925157,-16.6089531,2.58,0.00,0,0,0 153,Hilda,13.96,181.400,3.5082,0,0,2.258,-1.68,,10.8,0 0,16.8394,2023,10,8,39.4226,228.0934,7.8293,0.13910,3.97264,3.42005,7.66,5.0,0.15 1.031,0.0117,0.0009,83,0.0117,Known errors,-1.00,0,-1,-1 20231008_117567,60183.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org