IOTA/IOTA-ES occultation update for (674) Rachele / UCAC4 302-271490 event on 2022 Nov 28, 10:24 UT Visible from Australia Summary ------- On 2022 Nov 28 UT, the 93.8 km diameter asteroid (674) Rachele will occult a 12.0 mag star in the constellation Microscopium 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 1.94 mag to 13.69 mag (the magnitude of the asteroid) for at most 3.340 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: 2022 Nov 28, 10:21 - 2022 Nov 28, 10:28 * geocentric midpoint of event [JD]: 2459911.93393591 * magnitude of target star: 11.95 * magnitude drop [mag]: 1.94 * estimated maximum duration [s]: 3.340 * Moon: 27 % sunlit, 7° distance * Sun: 64° distance * rough path description: Australia Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 97 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 76°) * approx speed of asteroid's shadow [km/s]: 28.0652 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 302-271490 by 674 Rachele on 2022 Nov 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 - 20 0 0 -36 32 45 10 21 13.3 1 127 51 -37 6 2 -35 59 34 -37 11 10 -35 54 29 .... - 19 0 0 -37 9 25 10 21 13.4 2 127 51 -37 42 34 -36 36 22 -37 47 40 -36 31 18 0.31 - 18 0 0 -37 45 22 10 21 13.6 3 126 52 -38 18 23 -37 12 29 -38 23 28 -37 7 26 0.30 - 17 0 0 -38 20 37 10 21 13.8 4 125 53 -38 53 29 -37 47 52 -38 58 32 -37 42 51 0.30 - 16 0 0 -38 55 9 10 21 14.1 5 125 53 -39 27 52 -38 22 33 -39 32 54 -38 17 33 0.30 - 15 0 0 -39 28 58 10 21 14.5 6 124 54 -40 1 32 -38 56 31 -40 6 33 -38 51 33 0.29 - 14 0 0 -40 2 5 10 21 14.9 7 123 54 -40 34 29 -39 29 47 -40 39 28 -39 24 49 0.29 - 13 0 0 -40 34 28 10 21 15.4 7 123 55 -41 6 42 -40 2 19 -41 11 40 -39 57 23 0.29 - 12 0 0 -41 6 8 10 21 15.9 8 122 55 -41 38 13 -40 34 8 -41 43 10 -40 29 14 0.29 - 11 0 0 -41 37 5 10 21 16.5 9 121 56 -42 9 1 -41 5 15 -42 13 56 -41 0 22 0.29 - 10 0 0 -42 7 20 10 21 17.1 10 121 56 -42 39 7 -41 35 40 -42 44 0 -41 30 48 0.29 - 9 0 0 -42 36 53 10 21 17.8 11 120 57 -43 8 30 -42 5 22 -43 13 22 -42 0 31 0.29 - 8 0 0 -43 5 43 10 21 18.5 12 119 57 -43 37 11 -42 34 21 -43 42 1 -42 29 33 0.29 - 7 0 0 -43 33 52 10 21 19.3 13 119 57 -44 5 10 -43 2 39 -44 9 59 -42 57 52 0.29 - 6 0 0 -44 1 19 10 21 20.1 14 118 58 -44 32 27 -43 30 16 -44 37 15 -43 25 30 0.29 - 5 0 0 -44 28 5 10 21 21.0 15 117 58 -44 59 4 -43 57 11 -45 3 50 -43 52 27 0.29 - 4 0 0 -44 54 10 10 21 21.9 15 117 58 -45 24 59 -44 23 26 -45 29 44 -44 18 43 0.29 - 3 0 0 -45 19 35 10 21 22.8 16 116 59 -45 50 15 -44 49 0 -45 54 58 -44 44 18 0.29 - 2 0 0 -45 44 20 10 21 23.8 17 115 59 -46 14 50 -45 13 54 -46 19 32 -45 9 14 0.29 - 1 0 0 -46 8 25 10 21 24.8 18 114 59 -46 38 46 -45 38 9 -46 43 27 -45 33 30 0.29 0 0 0 -46 31 51 10 21 25.8 19 114 59 -47 2 4 -46 1 44 -47 6 43 -45 57 7 0.29 1 0 0 -46 54 39 10 21 26.9 19 113 59 -47 24 42 -46 24 41 -47 29 20 -46 20 5 0.29 2 0 0 -47 16 49 10 21 28.0 20 112 60 -47 46 43 -46 46 59 -47 51 19 -46 42 25 0.29 3 0 0 -47 38 21 10 21 29.1 21 111 60 -48 8 6 -47 8 40 -48 12 41 -47 4 7 0.29 4 0 0 -47 59 16 10 21 30.2 22 111 60 -48 28 52 -47 29 44 -48 33 26 -47 25 12 0.28 5 0 0 -48 19 34 10 21 31.4 22 110 60 -48 49 2 -47 50 10 -48 53 34 -47 45 40 0.28 6 0 0 -48 39 16 10 21 32.6 23 109 60 -49 8 36 -48 10 1 -49 13 6 -48 5 31 0.28 7 0 0 -48 58 22 10 21 33.8 24 108 60 -49 27 34 -48 29 15 -49 32 3 -48 24 47 0.28 8 0 0 -49 16 54 10 21 35.0 25 107 60 -49 45 57 -48 47 55 -49 50 25 -48 43 28 0.28 9 0 0 -49 34 50 10 21 36.3 25 107 60 -50 3 45 -49 5 59 -50 8 13 -49 1 34 0.28 10 0 0 -49 52 13 10 21 37.6 26 106 60 -50 21 0 -49 23 29 -50 25 26 -49 19 5 0.28 11 0 0 -50 9 1 10 21 38.9 27 105 60 -50 37 41 -49 40 26 -50 42 6 -49 36 2 0.28 12 0 0 -50 25 17 10 21 40.2 27 104 60 -50 53 49 -49 56 49 -50 58 13 -49 52 26 0.28 13 0 0 -50 40 59 10 21 41.5 28 103 60 -51 9 24 -50 12 38 -51 13 47 -50 8 17 0.28 14 0 0 -50 56 10 10 21 42.9 29 102 60 -51 24 28 -50 27 56 -51 28 49 -50 23 36 0.28 15 0 0 -51 10 48 10 21 44.2 29 102 60 -51 38 59 -50 42 41 -51 43 19 -50 38 22 0.28 16 0 0 -51 24 55 10 21 45.6 30 101 60 -51 52 59 -50 56 55 -51 57 19 -50 52 37 0.28 17 0 0 -51 38 31 10 21 47.0 31 100 59 -52 6 29 -51 10 38 -52 10 47 -51 6 21 0.28 18 0 0 -51 51 37 10 21 48.4 31 99 59 -52 19 28 -51 23 49 -52 23 45 -51 19 33 0.28 19 0 0 -52 4 12 10 21 49.9 32 98 59 -52 31 57 -51 36 31 -52 36 14 -51 32 16 0.28 20 0 0 -52 16 18 10 21 51.3 33 97 59 -52 43 57 -51 48 42 -52 48 12 -51 44 28 0.28 21 0 0 -52 27 54 10 21 52.7 33 97 59 -52 55 28 -52 0 24 -52 59 42 -51 56 11 0.28 22 0 0 -52 39 1 10 21 54.2 34 96 59 -53 6 29 -52 11 37 -53 10 43 -52 7 25 0.28 23 0 0 -52 49 40 10 21 55.7 35 95 58 -53 17 3 -52 22 21 -53 21 15 -52 18 10 0.28 24 0 0 -52 59 50 10 21 57.2 35 94 58 -53 27 8 -52 32 37 -53 31 20 -52 28 26 0.28 25 0 0 -53 9 33 10 21 58.7 36 93 58 -53 36 45 -52 42 24 -53 40 57 -52 38 14 0.28 26 0 0 -53 18 48 10 22 0.2 36 92 58 -53 45 55 -52 51 43 -53 50 6 -52 47 34 0.28 27 0 0 -53 27 35 10 22 1.7 37 91 58 -53 54 38 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.. 9 16 38 .. .. .. 2.50 Uncertainty in time = +/- 1 secs Prediction of 2022 Oct 2.0 Data for the target star ------------------------ * name: UCAC4 302-271490 * constellation : Microscopium * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 03 34.7761 DE: -29 40 20.451 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 03 34.7760 DE: -29 40 20.451 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (674) Rachele asteroid class: approx. diameter [km]: 94 approx. diameter ["]: 0.036 distance from Earth [AU]: 3.54790 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 date of fit: 2022 Sep 23 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", 76.021° remarks: * orbital elements for (674)Rachele : Mean anomaly = 244.2881190622 deg Arg. of pericenter = 41.5241704256 deg Long. of node = 58.1082316279 deg Inclination = 13.5079345329 deg Eccentricity = 0.1946396147 Semimajor axis = 2.9225781038 AU Perihelion dist = 2.3537286277 AU Mag: H = 7.51, G = 0.15 Epoch of elements : MJD 59911.43395833 TDT (2022 Nov 28.4340) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542022Sep23,3.34,2022,11,28,10.414462,0.121453,-0.238582,14.126333,7.167727,0.005330,0.001042,-0.000001,-0.000001 92.7125,-29.5845,20.76,-21.34,False UCAC4 302-271490,21.05966004,-29.6723475,0.00,11.95,0.00,0.0,0,,21.08222397,-29.5845184,1.94,0.00,0,0,0 674,Rachele,13.69,93.8,3.5479,0,0,2.685,17.77,,5.4,0 0,244.2025,2022,11,28,41.5242,58.1082,13.5079,0.19464,2.92258,2.35373,7.52,5.0,0.15 1.077,0.0117,0.0010,76,0.0028,Known errors,-1.00,-1,-1,-1 20221128_271490,59854.01 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 02, 00:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org