IOTA/IOTA-ES occultation update for (32) Pomona / TYC 6154-00399-1 event on 2023 Apr 28, 18:25 UT Visible from Australia, Africa Summary ------- On 2023 Apr 28 UT, the 80.4 km diameter asteroid (32) Pomona will occult a 10.7 mag star in the constellation Libra for observers along a path across Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.71 mag to 10.62 mag (the magnitude of the asteroid) for at most 8.290 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: 2023 Apr 28, 18:13 - 2023 Apr 28, 18:35 * geocentric midpoint of event [JD]: 2460063.26713750 * magnitude of target star: 10.70 * magnitude drop [mag]: 0.71 * estimated maximum duration [s]: 8.290 * Moon: 58 % sunlit, 87° distance * Sun: 174° distance * rough path description: Australia, Africa The occultation path -------------------- * approximate projected width [km]: 81 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.002", 103°) * approx speed of asteroid's shadow [km/s]: 9.7016 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6154-00399-1 by 32 Pomona on 2023 Apr 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 4 0 0 21 20 43 18 35 33.8 1 107 -7 21 43 39 20 57 45 21 47 15 20 54 10 .... 5 0 0 21 2 41 18 35 33.6 2 108 -8 21 25 41 20 39 40 21 29 17 20 36 4 0.13 6 0 0 20 44 8 18 35 33.2 3 108 -9 21 7 11 20 21 4 21 10 48 20 17 27 0.12 7 0 0 20 25 3 18 35 32.6 4 109 -10 20 48 10 20 1 55 20 51 47 19 58 18 0.11 8 0 0 20 5 27 18 35 31.8 5 109 -11 20 28 38 19 42 15 20 32 15 19 38 37 0.11 9 0 0 19 45 19 18 35 30.9 6 109 -12 20 8 34 19 22 4 20 12 12 19 18 25 0.11 10 0 0 19 24 40 18 35 29.7 7 110 -13 19 47 58 19 1 21 19 51 37 18 57 42 0.10 11 0 0 19 3 30 18 35 28.2 8 110 -14 19 26 52 18 40 7 19 30 32 18 36 27 0.10 12 0 0 18 41 49 18 35 26.6 9 110 -15 19 5 15 18 18 22 19 8 55 18 14 41 0.10 13 0 0 18 19 36 18 35 24.8 10 111 -16 18 43 6 17 56 6 18 46 47 17 52 25 0.10 14 0 0 17 56 53 18 35 22.8 11 111 -17 18 20 27 17 33 19 18 24 9 17 29 37 0.10 15 0 0 17 33 40 18 35 20.5 12 111 -18 17 57 18 17 10 1 18 1 0 17 6 19 0.10 16 0 0 17 9 56 18 35 18.1 13 111 -19 17 33 38 16 46 13 17 37 20 16 42 30 0.10 17 0 0 16 45 42 18 35 15.4 14 112 -20 17 9 27 16 21 55 17 13 11 16 18 12 0.10 18 0 0 16 20 58 18 35 12.5 15 112 -21 16 44 47 15 57 7 16 48 31 15 53 23 0.10 19 0 0 15 55 44 18 35 9.4 16 112 -22 16 19 38 15 31 50 16 23 22 15 28 5 0.10 20 0 0 15 30 1 18 35 6.0 17 112 -23 15 53 59 15 6 3 15 57 44 15 2 17 0.10 21 0 0 15 3 49 18 35 2.5 18 113 -24 15 27 51 14 39 47 15 31 36 14 36 1 0.10 22 0 0 14 37 8 18 34 58.7 19 113 -25 15 1 14 14 13 2 15 5 0 14 9 15 0.10 23 0 0 14 9 59 18 34 54.6 20 113 -26 14 34 9 13 45 49 14 37 56 13 42 1 0.10 24 0 0 13 42 22 18 34 50.4 21 113 -27 14 6 35 13 18 7 14 10 23 13 14 19 0.10 25 0 0 13 14 17 18 34 45.9 22 114 -28 13 38 34 12 49 59 13 42 23 12 46 10 0.10 26 0 0 12 45 45 18 34 41.2 23 114 -29 13 10 6 12 21 23 13 13 55 12 17 34 0.10 27 0 0 12 16 46 18 34 36.3 24 114 -31 12 41 11 11 52 20 12 45 1 11 48 30 0.10 28 0 0 11 47 21 18 34 31.1 25 114 -32 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5 254 2 -34 33 53 -35 19 33 -34 30 18 -35 23 7 0.13 -171 0 0 -34 41 31 18 13 49.3 4 253 2 -34 18 38 -35 4 25 -34 15 3 -35 8 1 0.14 -170 0 0 -34 25 50 18 13 48.7 3 253 3 -34 2 54 -34 48 48 -33 59 18 -34 52 24 0.15 -169 0 0 -34 9 39 18 13 48.3 2 252 4 -33 46 39 -34 32 40 -33 43 2 -34 36 16 0.17 -168 0 0 -33 52 57 18 13 48.0 1 251 5 -33 29 53 -34 16 2 -33 26 16 -34 19 39 0.23 -167 0 0 -33 35 44 18 13 47.9 0 251 6 -33 12 36 -33 58 53 -33 8 59 -34 2 30 0.66 Uncertainty in time = +/- 2 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: TYC 6154-00399-1 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 47 54.6798 DE: -15 56 52.839 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 47 54.6798 DE: -15 56 52.839 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (32) Pomona asteroid class: approx. diameter [km]: 80 approx. diameter ["]: 0.080 distance from Earth [AU]: 1.38760 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#128 date of fit: 2023 Feb 07 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): 0.022", 0.002", 102.777° remarks: * orbital elements for (32)Pomona : Mean anomaly = 19.4025706767 deg Arg. of pericenter = 338.4543479581 deg Long. of node = 220.3631660827 deg Inclination = 5.5218522155 deg Eccentricity = 0.0816953375 Semimajor axis = 2.5879005676 AU Perihelion dist = 2.3764811573 AU Mag: H = 7.72, G = 0.15 Epoch of elements : MJD 60062.76743056 TDT (2023 Apr 28.7674) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1282023Feb07,8.29,2023,4,28,18.411300,-0.052345,-0.096070,-4.808383,2.619950,-0.000571,0.000152,0.000001,0.000000 89.6688,-16.0465,-96.79,14.25,False TYC 6154-00399-1,14.79852216,-15.9480107,0.00,10.70,0.00,0.0,0,,14.82025902,-16.0465355,0.71,0.00,0,0,0 32,Pomona,10.62,80.4,1.3876,0,0,-2.114,16.60,,3.8,0 0,19.2209,2023,4,28,338.4543,220.3632,5.5219,0.08170,2.58790,2.37648,7.73,5.0,0.15 1.078,0.0223,0.0016,103,0.0063,Known errors,-1.00,-1,-1,-1 20230428_0399-1,60004.06 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org