IOTA/IOTA-ES occultation update for (269) Justitia / UCAC4 376-149653 event on 2022 May 01, 17:03 UT Visible from Australia Summary ------- On 2022 May 01 UT, the 56.1 km diameter asteroid (269) Justitia will occult a 11.4 mag star in the constellation Sagittarius 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 2.07 mag to 13.27 mag (the magnitude of the asteroid) for at most 6.700 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 01, 16:50 - 2022 May 01, 17:15 * geocentric midpoint of event [JD]: 2459701.21044109 * magnitude of target star: 11.37 * magnitude drop [mag]: 2.07 * estimated maximum duration [s]: 6.700 * Moon: 1 % sunlit, 125° distance * Sun: 116° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 56 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.037, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.037", 0.003", 90°) * approx speed of asteroid's shadow [km/s]: 8.3726 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 376-149653 by 269 Justitia on 2022 May 1 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 79 0 0 -18 7 13 16 50 20.7 1 105 -63 -18 22 59 -17 51 27 -18 30 21 -17 44 5 .... 80 0 0 -18 22 49 16 50 21.0 2 105 -64 -18 38 33 -18 7 4 -18 45 55 -17 59 43 0.06 81 0 0 -18 38 3 16 50 21.5 3 105 -65 -18 53 47 -18 22 20 -19 1 7 -18 14 59 0.04 82 0 0 -18 52 56 16 50 22.2 4 104 -66 -19 8 38 -18 37 14 -19 15 58 -18 29 54 0.03 83 0 0 -19 7 27 16 50 23.2 5 104 -67 -19 23 8 -18 51 47 -19 30 27 -18 44 27 0.02 84 0 0 -19 21 36 16 50 24.4 6 104 -68 -19 37 16 -19 5 57 -19 44 34 -18 58 39 0.02 85 0 0 -19 35 24 16 50 25.8 7 103 -69 -19 51 2 -19 19 46 -19 58 19 -19 12 28 0.02 86 0 0 -19 48 49 16 50 27.4 8 103 -70 -20 4 25 -19 33 12 -20 11 42 -19 25 55 0.01 87 0 0 -20 1 51 16 50 29.2 9 103 -71 -20 17 26 -19 46 16 -20 24 43 -19 38 59 0.01 88 0 0 -20 14 31 16 50 31.2 10 102 -72 -20 30 5 -19 58 57 -20 37 21 -19 51 41 0.01 89 0 0 -20 26 48 16 50 33.5 11 102 -72 -20 42 21 -20 11 16 -20 49 36 -20 4 0 0.01 90 0 0 -20 38 43 16 50 35.9 11 102 -73 -20 54 14 -20 23 11 -21 1 29 -20 15 56 0.01 91 0 0 -20 50 14 16 50 38.6 12 101 -74 -21 5 45 -20 34 44 -21 12 59 -20 27 30 0.01 92 0 0 -21 1 23 16 50 41.5 13 101 -75 -21 16 52 -20 45 54 -21 24 6 -20 38 40 0.01 93 0 0 -21 12 8 16 50 44.5 14 101 -76 -21 27 36 -20 56 40 -21 34 49 -20 49 27 0.00 94 0 0 -21 22 30 16 50 47.8 15 100 -77 -21 37 57 -21 7 3 -21 45 9 -20 59 50 0.00 95 0 0 -21 32 29 16 50 51.3 16 100 -77 -21 47 54 -21 17 3 -21 55 6 -21 9 51 0.00 96 0 0 -21 42 4 16 50 55.0 17 100 -78 -21 57 28 -21 26 39 -22 4 40 -21 19 27 0.00 97 0 0 -21 51 15 16 50 58.8 18 99 -79 -22 6 39 -21 35 51 -22 13 50 -21 28 40 0.00 98 0 0 -22 0 3 16 51 2.9 19 99 -79 -22 15 26 -21 44 40 -22 22 36 -21 37 30 0.00 99 0 0 -22 8 27 16 51 7.2 20 98 -80 -22 23 49 -21 53 5 -22 30 59 -21 45 55 0.00 100 0 0 -22 16 27 16 51 11.6 21 98 -81 -22 31 48 -22 1 6 -22 38 58 -21 53 56 0.00 101 0 0 -22 24 3 16 51 16.3 22 98 -81 -22 39 23 -22 8 43 -22 46 33 -22 1 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0 18 49 25 17 15 43.6 1 254 62 18 33 36 19 5 13 18 26 14 19 12 36 0.18 Uncertainty in time = +/- 5 secs Prediction of 2022 Apr 15.8 Data for the target star ------------------------ * name: UCAC4 376-149653 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 00 00.7972 DE: -14 51 46.542 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 00 00.7973 DE: -14 51 46.542 * 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: (269) Justitia asteroid class: approx. diameter [km]: 56 approx. diameter ["]: 0.054 distance from Earth [AU]: 1.42560 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#93 date of fit: 2022 Apr 11 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): 0.037", 0.003", 90.225° remarks: * orbital elements for (269)Justitia : Mean anomaly = 348.6702918173 deg Arg. of pericenter = 119.7404110173 deg Long. of node = 156.7129192934 deg Inclination = 5.4785504256 deg Eccentricity = 0.2128438186 Semimajor axis = 2.6157917901 AU Perihelion dist = 2.0590366767 AU Mag: H = 9.82, G = 0.15 Epoch of elements : MJD 59700.71048611 TDT (2022 May 01.7105) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#932022Apr11,6.70,2022,5,1,17.050586,-0.002942,0.009028,4.468458,1.537985,-0.004674,-0.000820,0.000001,0.000000 169.9567,-14.8328,-76.48,15.22,False UCAC4 376-149653,19.00022144,-14.8629284,0.00,11.37,0.00,0.0,0,,19.02131312,-14.8327842,2.08,0.00,0,0,0 269,Justitia,13.27,56.1,1.4256,0,0,1.901,9.49,,2.8 0,348.5048,2022,5,1,119.7404,156.7129,5.4786,0.21284,2.61579,2.05904,9.74,5.0,0.15 1.233,0.0373,0.0032,90,0.0127,Known errors,-1.00,-1,-1,-1 20220501_149653,59684.83 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Apr 15, 19:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org