IOTA/IOTA-ES occultation update for (4) Vesta / HIP 112920 event on 2022 Dec 19, 03:29 UT Visible from Mexico Summary ------- On 2022 Dec 19 UT, the 529 km diameter asteroid (4) Vesta will occult a 9.5 mag star in the constellation Aquarius for observers along a path across Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.30 mag to 8.29 mag (the magnitude of the asteroid) for at most 19.200 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 Dec 19, 03:25 - 2022 Dec 19, 03:33 * geocentric midpoint of event [JD]: 2459932.64524583 * magnitude of target star: 9.53 * magnitude drop [mag]: 0.30 * estimated maximum duration [s]: 19.200 * Moon: 22 % sunlit, 128° distance * Sun: 72° distance * rough path description: Mexico Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 532 * 1 sigma uncertainty interval [path widths]: +/- 0.00 * 1 sigma uncertainty interval [seconds]: +/- 0.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.003, +/- 0.000) * 1 sigma uncertainty ellipse (major, minor, PA): (0.003", 0.000", 84°) * approx speed of asteroid's shadow [km/s]: 27.6196 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 112920 by 4 Vesta on 2022 Dec 19 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 109 0 0 -20 12 15 3 25 19.5 0 105 72 -22 41 13 .. .. .. -22 42 27 .. .. .. .... 110 0 0 -20 27 25 3 25 19.5 1 105 73 -22 56 4 -17 58 4 -22 57 18 -17 56 49 0.03 111 0 0 -20 42 5 3 25 19.6 2 105 74 -23 10 27 -18 13 3 -23 11 41 -18 11 48 -0.03 112 0 0 -20 56 16 3 25 19.8 3 104 75 -23 24 20 -18 27 32 -23 25 34 -18 26 17 -0.06 113 0 0 -21 9 58 3 25 20.0 4 104 76 -23 37 44 -18 41 30 -23 38 58 -18 40 16 -0.07 114 0 0 -21 23 9 3 25 20.3 5 103 77 -23 50 39 -18 54 59 -23 51 53 -18 53 45 -0.07 115 0 0 -21 35 52 3 25 20.7 6 103 78 -24 3 5 -19 7 57 -24 4 18 -19 6 43 -0.08 116 0 0 -21 48 4 3 25 21.1 7 103 79 -24 15 2 -19 20 26 -24 16 15 -19 19 12 -0.08 117 0 0 -21 59 47 3 25 21.6 8 102 80 -24 26 30 -19 32 24 -24 27 43 -19 31 10 -0.09 118 0 0 -22 11 0 3 25 22.2 9 102 81 -24 37 28 -19 43 52 -24 38 41 -19 42 38 -0.09 119 0 0 -22 21 44 3 25 22.8 10 102 82 -24 47 58 -19 54 49 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0 0 27 3 45 3 32 52.3 13 246 -56 24 28 8 29 40 4 24 26 51 29 41 23 -0.09 - 90 0 0 27 25 52 3 32 53.2 12 247 -57 24 50 40 30 1 46 24 49 23 30 3 5 -0.09 - 89 0 0 27 47 31 3 32 54.0 11 247 -58 25 12 43 30 23 0 25 11 26 30 24 18 -0.09 - 88 0 0 28 8 41 3 32 54.7 10 247 -59 25 34 18 30 43 46 25 33 1 30 45 3 -0.09 - 87 0 0 28 29 22 3 32 55.4 10 248 -60 25 55 24 31 4 3 25 54 7 31 5 20 -0.09 - 86 0 0 28 49 36 3 32 56.0 9 248 -61 26 16 1 31 23 52 26 14 45 31 25 9 -0.09 - 85 0 0 29 9 20 3 32 56.5 8 249 -62 26 36 10 31 43 12 26 34 53 31 44 29 -0.09 - 84 0 0 29 28 37 3 32 57.0 7 249 -62 26 55 49 32 2 5 26 54 33 32 3 21 -0.09 - 83 0 0 29 47 24 3 32 57.4 6 250 -63 27 15 1 32 20 29 27 13 44 32 21 45 -0.09 - 82 0 0 30 5 44 3 32 57.7 5 250 -64 27 33 43 32 38 25 27 32 27 32 39 41 -0.09 - 81 0 0 30 23 35 3 32 58.0 4 251 -65 27 51 56 32 55 53 27 50 41 32 57 9 -0.08 - 80 0 0 30 40 57 3 32 58.2 3 251 -66 28 9 41 33 12 53 28 8 26 33 14 9 -0.08 - 79 0 0 30 57 51 3 32 58.4 2 252 -67 28 26 58 33 29 25 28 25 42 33 30 41 -0.07 - 78 0 0 31 14 18 3 32 58.5 1 252 -67 28 43 45 33 45 29 28 42 30 33 46 45 -0.05 - 77 0 0 31 30 15 3 32 58.6 0 253 -68 29 0 4 .. .. .. 28 58 49 .. .. .. 0.05 Uncertainty in time = +/- 0 secs Prediction of 2021 Jun 12.0 Data for the target star ------------------------ * name: HIP 112920 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 52 05.8385 DE: -14 25 55.314 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 52 05.8379 DE: -14 25 55.317 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4) Vesta asteroid class: approx. diameter [km]: 529 approx. diameter ["]: 0.290 distance from Earth [AU]: 2.51830 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#36 date of fit: 2021 Apr 13 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): 0.003", 0.000", 84.4° remarks: * orbital elements for (4)Vesta : Mean anomaly = 96.8154823813 deg Arg. of pericenter = 151.5048912498 deg Long. of node = 103.7785300554 deg Inclination = 7.1393869346 deg Eccentricity = 0.0886085921 Semimajor axis = 2.3628827988 AU Perihelion dist = 2.1535110807 AU Mag: H = 3.31, G = 0.32 Epoch of elements : MJD 59932.14534722 TDT (2022 Dec 19.1453) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#362021Apr13,19.15,2022,12,19,3.4859,-0.045420,0.092424,13.933548,6.991578,0.005194,0.001934,0.000000,0.000000 -156.6829,-14.3127,126.93,-23.41,False HIP 112920,22.86828834,-14.4320324,0.00,9.53,0.00,0.0,4,,22.88826361,-14.3126848 4,Vesta,8.29,529.0,2.5183,0,0,3.348,24.42,,0.0 0,96.7760,2022,12,19,151.5049,103.7785,7.1394,0.08861,2.36288,2.15351,3.29,5.0,0.15 1.004,0.0033,0.0001,84,0.0012,Known errors,-1.00,-1,-1,-1 20221219_112920,59377.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Jun 12, 20:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org