IOTA/IOTA-ES occultation update for (1583) Antilochus / UCAC4 429-015899 event on 2022 Dec 02, 07:29 UT Visible from South America Summary ------- On 2022 Dec 02 UT, the 107.3 km diameter asteroid (1583) Antilochus will occult a 11.4 mag star in the constellation Monoceros 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 4.27 mag to 15.69 mag (the magnitude of the asteroid) for at most 6.320 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: 93 * date and approx. time of event: 2022 Dec 02, 07:23 - 2022 Dec 02, 07:35 * geocentric midpoint of event [JD]: 2459915.81208620 * magnitude of target star: 11.44 * magnitude drop [mag]: 4.27 * estimated maximum duration [s]: 6.320 * Moon: 68 % sunlit, 94° distance * Sun: 142° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 110 * 1 sigma uncertainty interval [path widths]: +/- 0.48 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.002", 111°) * approx speed of asteroid's shadow [km/s]: 16.9706 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 429-015899 by 1583 Antilochus on 2022 Dec 2 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 178 0 0 -46 7 17 7 35 28.8 0 96 0 -45 37 21 -46 37 17 -45 8 29 -47 6 19 .... 179 0 0 -46 11 23 7 35 28.8 1 95 -1 -45 41 28 -46 41 22 -45 12 38 -47 10 22 0.19 -180 0 0 -46 15 4 7 35 28.7 2 94 -1 -45 45 11 -46 45 1 -45 16 23 -47 14 0 0.21 -179 0 0 -46 18 21 7 35 28.5 2 94 -2 -45 48 29 -46 48 17 -45 19 42 -47 17 15 0.22 -178 0 0 -46 21 14 7 35 28.3 3 93 -2 -45 51 23 -46 51 9 -45 22 37 -47 20 5 0.22 -177 0 0 -46 23 42 7 35 28.0 4 92 -3 -45 53 52 -46 53 36 -45 25 7 -47 22 31 0.22 -176 0 0 -46 25 46 7 35 27.7 4 91 -3 -45 55 57 -46 55 39 -45 27 13 -47 24 34 0.23 -175 0 0 -46 27 26 7 35 27.3 5 91 -4 -45 57 38 -46 57 18 -45 28 54 -47 26 13 0.23 -174 0 0 -46 28 42 7 35 26.8 6 90 -4 -45 58 54 -46 58 34 -45 30 11 -47 27 28 0.23 -173 0 0 -46 29 34 7 35 26.3 6 89 -5 -45 59 46 -46 59 25 -45 31 3 -47 28 19 0.23 -172 0 0 -46 30 2 7 35 25.8 7 89 -5 -46 0 14 -46 59 53 -45 31 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18 16 36 19 45 29 17 47 32 0.49 Uncertainty in time = +/- 4 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4 429-015899 * constellation : Monoceros * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 26 51.9273 DE: -04 13 26.785 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 26 51.9274 DE: -04 13 26.785 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1583) Antilochus asteroid class: approx. diameter [km]: 107 approx. diameter ["]: 0.036 distance from Earth [AU]: 4.13330 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#62 date of fit: 2022 Nov 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): 0.021", 0.002", 111.45° remarks: * orbital elements for (1583)Antilochus : Mean anomaly = 42.2825983305 deg Arg. of pericenter = 187.3287289978 deg Long. of node = 221.3791300053 deg Inclination = 28.4911884041 deg Eccentricity = 0.0538645670 Semimajor axis = 5.1428292811 AU Perihelion dist = 4.8658130089 AU Mag: H = 8.60, G = 0.15 Epoch of elements : MJD 59915.31222222 TDT (2022 Dec 02.3122) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#622022Nov22,6.32,2022,12,2,7.490069,0.126368,-0.199089,-8.087331,-5.132829,-0.002690,0.002665,0.000001,0.000000 -86.4747,-4.2364,64.98,-21.96,False UCAC4 429-015899,6.44775759,-4.2241070,0.00,11.44,0.00,0.0,0,,6.46685551,-4.2364459,4.27,0.00,0,0,0 1583,Antilochus,15.69,107.3,4.1333,0,0,-1.150,-10.92,,6.8,0 0,42.2562,2022,12,2,187.3287,221.3791,28.4912,0.05386,5.14283,4.86581,8.61,5.0,0.15 1.483,0.0213,0.0023,111,0.0173,Known errors,-1.00,-1,-1,-1 20221202_015899,59914.08 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 01:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org