IOTA/IOTA-ES occultation update for (14) Irene / UCAC4 315-227743 event on 2022 Jul 02, 17:04 UT Visible from S Australia Summary ------- On 2022 Jul 02 UT, the 146.5 km diameter asteroid (14) Irene will occult a 11.9 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 0.15 mag to 9.85 mag (the magnitude of the asteroid) for at most 12.630 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 Jul 02, 16:55 - 2022 Jul 02, 17:12 * geocentric midpoint of event [JD]: 2459763.21121771 * magnitude of target star: 11.89 * magnitude drop [mag]: 0.15 * estimated maximum duration [s]: 12.630 * Moon: 11 % sunlit, 146° distance * Sun: 174° distance * rough path description: S Australia Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 162 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.003", 89°) * approx speed of asteroid's shadow [km/s]: 11.6030 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 315-227743 by 14 Irene on 2022 Jul 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 - 6 0 0 -40 35 28 17 12 25.5 1 126 -1 -39 41 50 -41 29 36 -39 35 22 -41 36 11 .... - 5 0 0 -41 8 38 17 12 25.2 2 125 -2 -40 15 9 -42 2 36 -40 8 42 -42 9 10 0.44 - 4 0 0 -41 41 14 17 12 24.9 3 124 -3 -40 47 54 -42 35 3 -40 41 29 -42 41 35 0.45 - 3 0 0 -42 13 17 17 12 24.3 4 124 -4 -41 20 6 -43 6 55 -41 13 42 -43 13 26 0.45 - 2 0 0 -42 44 45 17 12 23.6 4 123 -5 -41 51 45 -43 38 13 -41 45 22 -43 44 43 0.45 - 1 0 0 -43 15 39 17 12 22.8 5 122 -6 -42 22 49 -44 8 57 -42 16 27 -44 15 26 0.45 0 0 0 -43 45 59 17 12 21.8 6 122 -7 -42 53 20 -44 39 6 -42 46 59 -44 45 34 0.45 1 0 0 -44 15 45 17 12 20.8 7 121 -8 -43 23 16 -45 8 40 -43 16 57 -45 15 7 0.45 2 0 0 -44 44 56 17 12 19.5 8 120 -9 -43 52 38 -45 37 40 -43 46 20 -45 44 5 0.45 3 0 0 -45 13 32 17 12 18.2 9 120 -9 -44 21 26 -46 6 5 -44 15 9 -46 12 29 0.45 4 0 0 -45 41 34 17 12 16.8 10 119 -10 -44 49 39 -46 33 56 -44 43 24 -46 40 18 0.45 5 0 0 -46 9 2 17 12 15.2 10 118 -11 -45 17 18 -47 1 12 -45 11 4 -47 7 32 0.46 6 0 0 -46 35 55 17 12 13.6 11 117 -12 -45 44 23 -47 27 53 -45 38 11 -47 34 12 0.46 7 0 0 -47 2 14 17 12 11.8 12 117 -13 -46 10 54 -47 54 0 -46 4 43 -48 0 18 0.46 8 0 0 -47 27 59 17 12 9.9 13 116 -13 -46 36 51 -48 19 33 -46 30 41 -48 25 49 0.46 9 0 0 -47 53 11 17 12 8.0 14 115 -14 -47 2 14 -48 44 32 -46 56 6 -48 50 47 0.46 10 0 0 -48 17 48 17 12 6.0 14 114 -15 -47 27 4 -49 8 58 -47 20 57 -49 15 11 0.46 11 0 0 -48 41 52 17 12 3.9 15 114 -16 -47 51 20 -49 32 50 -47 45 14 -49 39 1 0.46 12 0 0 -49 5 23 17 12 1.7 16 113 -16 -48 15 3 -49 56 8 -48 8 59 -50 2 19 0.46 13 0 0 -49 28 21 17 11 59.4 17 112 -17 -48 38 13 -50 18 54 -48 32 10 -50 25 3 0.46 14 0 0 -49 50 47 17 11 57.1 17 111 -18 -49 0 50 -50 41 7 -48 54 49 -50 47 15 0.46 15 0 0 -50 12 40 17 11 54.7 18 111 -19 -49 22 55 -51 2 48 -49 16 56 -51 8 54 0.46 16 0 0 -50 34 1 17 11 52.2 19 110 -19 -49 44 28 -51 23 57 -49 38 30 -51 30 1 0.46 17 0 0 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36 39 - 7 16 21 - 5 30 40 - 7 22 26 0.53 -159 0 0 - 5 53 19 16 55 53.6 4 243 1 - 5 3 51 - 6 43 10 - 4 57 53 - 6 49 13 0.56 -158 0 0 - 5 20 51 16 55 52.8 3 243 2 - 4 31 34 - 6 10 30 - 4 25 37 - 6 16 32 0.60 -157 0 0 - 4 48 55 16 55 52.4 2 243 4 - 3 59 48 - 5 38 22 - 3 53 53 - 5 44 23 0.68 -156 0 0 - 4 17 31 16 55 52.1 1 243 5 - 3 28 36 - 5 6 47 - 3 22 42 - 5 12 47 1.07 Uncertainty in time = +/- 2 secs Prediction of 2022 Jun 13.9 Data for the target star ------------------------ * name: UCAC4 315-227743 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 07 39.5814 DE: -27 01 09.706 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 07 39.5814 DE: -27 01 09.706 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (14) Irene asteroid class: approx. diameter [km]: 147 approx. diameter ["]: 0.128 distance from Earth [AU]: 1.57370 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#97 date of fit: 2022 Jun 10 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", 0.003", 88.959° remarks: * orbital elements for (14)Irene : Mean anomaly = 80.6182908667 deg Arg. of pericenter = 97.7080748074 deg Long. of node = 86.1158918684 deg Inclination = 9.1209212981 deg Eccentricity = 0.1657788995 Semimajor axis = 2.5857532381 AU Perihelion dist = 2.1570899119 AU Mag: H = 6.56, G = 0.15 Epoch of elements : MJD 59762.71111111 TDT (2022 Jul 02.7111) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#972022Jun10,12.63,2022,7,2,17.069225,0.151584,-0.398731,-6.121675,-2.327064,-0.000466,0.000371,0.000001,0.000000 110.5127,-26.9837,-75.00,23.00,False UCAC4 315-227743,19.12766151,-27.0193628,0.00,11.89,0.00,0.0,0,,19.15112425,-26.9836999,0.15,0.00,0,0,0 14,Irene,9.85,146.5,1.5737,0,0,-2.559,-13.00,,9.8 0,80.4497,2022,7,2,97.7081,86.1159,9.1209,0.16578,2.58575,2.15709,6.53,5.0,0.15 1.061,0.0210,0.0033,89,0.0078,Known errors,-1.00,-1,-1,-1 20220702_227743,59743.85 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 13, 20:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org