IOTA/IOTA-ES occultation update for (928) Hildrun / UCAC4 339-194151 event on 2022 Nov 15, 09:17 UT Visible from Australia Summary ------- On 2022 Nov 15 UT, the 63.2 km diameter asteroid (928) Hildrun will occult a 12.3 mag star in the constellation Capricornus 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 4.25 mag to 16.48 mag (the magnitude of the asteroid) for at most 2.890 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 15, 09:12 - 2022 Nov 15, 09:22 * geocentric midpoint of event [JD]: 2459898.88735446 * magnitude of target star: 12.25 * magnitude drop [mag]: 4.25 * estimated maximum duration [s]: 2.890 * Moon: 62 % sunlit, 178° distance * Sun: 75° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 63 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.002", 94°) * approx speed of asteroid's shadow [km/s]: 21.8819 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 339-194151 by 928 Hildrun on 2022 Nov 15 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 25 0 0 - 9 16 53 9 12 56.0 0 112 74 - 9 35 27 - 8 58 20 - 9 39 8 - 8 54 39 .... 26 0 0 - 9 41 23 9 12 56.1 1 112 75 - 9 59 55 - 9 22 51 -10 3 37 - 9 19 10 0.12 27 0 0 -10 5 41 9 12 56.3 2 112 76 -10 24 12 - 9 47 10 -10 27 53 - 9 43 29 0.08 28 0 0 -10 29 47 9 12 56.6 4 112 77 -10 48 17 -10 11 17 -10 51 58 -10 7 36 0.06 29 0 0 -10 53 40 9 12 57.0 5 112 78 -11 12 9 -10 35 12 -11 15 50 -10 31 31 0.06 30 0 0 -11 17 21 9 12 57.5 6 112 79 -11 35 48 -10 58 53 -11 39 28 -10 55 13 0.05 31 0 0 -11 40 47 9 12 58.0 7 111 80 -11 59 13 -11 22 21 -12 2 54 -11 18 41 0.05 32 0 0 -12 4 0 9 12 58.7 8 111 81 -12 22 25 -11 45 35 -12 26 5 -11 41 55 0.05 33 0 0 -12 26 58 9 12 59.5 9 111 82 -12 45 21 -12 8 35 -12 49 1 -12 4 55 0.04 34 0 0 -12 49 41 9 13 0.4 10 111 83 -13 8 3 -12 31 19 -13 11 42 -12 27 40 0.04 35 0 0 -13 12 9 9 13 1.3 11 110 84 -13 30 29 -12 53 48 -13 34 8 -12 50 9 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47 250 -27 -12 17 11 -11 40 17 -12 20 51 -11 36 37 0.03 161 0 0 -11 35 9 9 21 9.2 46 250 -28 -11 53 37 -11 16 40 -11 57 18 -11 13 0 0.03 162 0 0 -11 11 19 9 21 13.1 45 250 -29 -11 29 49 -10 52 49 -11 33 30 -10 49 8 0.03 163 0 0 -10 47 15 9 21 16.9 44 249 -30 -11 5 46 -10 28 44 -11 9 27 -10 25 3 0.03 164 0 0 -10 22 58 9 21 20.7 43 249 -31 -10 41 30 -10 4 25 -10 45 11 -10 0 44 0.03 165 0 0 - 9 58 27 9 21 24.4 42 249 -32 -10 17 1 - 9 39 54 -10 20 43 - 9 36 12 0.03 166 0 0 - 9 33 44 9 21 28.0 41 249 -33 - 9 52 19 - 9 15 10 - 9 56 1 - 9 11 28 0.03 167 0 0 - 9 8 50 9 21 31.6 40 249 -35 - 9 27 26 - 8 50 14 - 9 31 8 - 8 46 32 0.03 168 0 0 - 8 43 44 9 21 35.1 39 249 -36 - 9 2 21 - 8 25 7 - 9 6 3 - 8 21 25 0.03 169 0 0 - 8 18 27 9 21 38.5 38 248 -37 - 8 37 5 - 7 59 49 - 8 40 48 - 7 56 7 0.03 170 0 0 - 7 53 0 9 21 41.8 36 248 -38 - 8 11 39 - 7 34 22 - 8 15 22 - 7 30 39 0.03 171 0 0 - 7 27 24 9 21 45.1 35 248 -39 - 7 46 4 - 7 8 45 - 7 49 47 - 7 5 2 0.03 172 0 0 - 7 1 39 9 21 48.3 34 248 -40 - 7 20 20 - 6 42 59 - 7 24 3 - 6 39 16 0.03 173 0 0 - 6 35 46 9 21 51.3 33 248 -41 - 6 54 27 - 6 17 5 - 6 58 10 - 6 13 22 0.04 174 0 0 - 6 9 45 9 21 54.3 32 248 -42 - 6 28 27 - 5 51 3 - 6 32 11 - 5 47 20 0.04 175 0 0 - 5 43 37 9 21 57.3 31 248 -43 - 6 2 20 - 5 24 55 - 6 6 4 - 5 21 12 0.04 176 0 0 - 5 17 24 9 22 0.1 30 247 -44 - 5 36 7 - 4 58 40 - 5 39 50 - 4 54 57 0.04 177 0 0 - 4 51 4 9 22 2.8 29 247 -45 - 5 9 48 - 4 32 20 - 5 13 31 - 4 28 37 0.04 178 0 0 - 4 24 40 9 22 5.5 28 247 -46 - 4 43 24 - 4 5 56 - 4 47 8 - 4 2 12 0.04 179 0 0 - 3 58 11 9 22 8.0 27 247 -48 - 4 16 56 - 3 39 27 - 4 20 39 - 3 35 43 0.04 180 0 0 - 3 31 39 9 22 10.5 25 247 -49 - 3 50 24 - 3 12 54 - 3 54 8 - 3 9 11 0.04 -179 0 0 - 3 5 4 9 22 12.8 24 247 -50 - 3 23 49 - 2 46 19 - 3 27 33 - 2 42 36 0.04 -178 0 0 - 2 38 27 9 22 15.1 23 247 -51 - 2 57 12 - 2 19 42 - 3 0 56 - 2 15 58 0.04 -177 0 0 - 2 11 49 9 22 17.3 22 247 -52 - 2 30 34 - 1 53 4 - 2 34 18 - 1 49 20 0.04 -176 0 0 - 1 45 10 9 22 19.3 21 247 -53 - 2 3 55 - 1 26 24 - 2 7 39 - 1 22 41 0.04 -175 0 0 - 1 18 30 9 22 21.3 20 247 -54 - 1 37 16 - 0 59 45 - 1 40 59 - 0 56 2 0.04 -174 0 0 - 0 51 52 9 22 23.1 19 247 -55 - 1 10 37 - 0 33 7 - 1 14 21 - 0 29 23 0.04 -173 0 0 - 0 25 15 9 22 24.9 18 247 -56 - 0 43 59 - 0 6 30 - 0 47 43 - 0 2 46 0.04 -172 0 0 0 1 21 9 22 26.6 17 247 -57 - 0 17 24 0 20 5 - 0 21 8 0 23 49 0.04 -171 0 0 0 27 53 9 22 28.1 16 247 -58 0 9 9 0 46 37 0 5 25 0 50 21 0.04 -170 0 0 0 54 22 9 22 29.6 14 247 -59 0 35 38 1 13 6 0 31 55 1 16 49 0.04 -169 0 0 1 20 47 9 22 30.9 13 247 -60 1 2 4 1 39 30 0 58 20 1 43 14 0.04 -168 0 0 1 47 7 9 22 32.1 12 247 -62 1 28 25 2 5 50 1 24 41 2 9 33 0.04 -167 0 0 2 13 22 9 22 33.3 11 247 -63 1 54 40 2 32 4 1 50 57 2 35 48 0.05 -166 0 0 2 39 31 9 22 34.3 10 247 -64 2 20 50 2 58 13 2 17 6 3 1 56 0.05 -165 0 0 3 5 33 9 22 35.2 9 247 -65 2 46 52 3 24 14 2 43 9 3 27 57 0.05 -164 0 0 3 31 28 9 22 36.0 8 247 -66 3 12 48 3 50 8 3 9 5 3 53 51 0.05 -163 0 0 3 57 15 9 22 36.7 7 247 -67 3 38 36 4 15 54 3 34 53 4 19 37 0.06 -162 0 0 4 22 53 9 22 37.3 6 247 -68 4 4 15 4 41 31 4 0 32 4 45 14 0.06 -161 0 0 4 48 22 9 22 37.8 5 247 -69 4 29 45 5 6 59 4 26 3 5 10 42 0.07 -160 0 0 5 13 42 9 22 38.2 4 247 -70 4 55 5 5 32 18 4 51 23 5 36 0 0.08 -159 0 0 5 38 51 9 22 38.5 2 247 -71 5 20 16 5 57 26 5 16 34 6 1 8 0.09 -158 0 0 6 3 49 9 22 38.7 1 248 -72 5 45 15 6 22 23 5 41 33 6 26 4 0.14 -157 0 0 6 28 36 9 22 38.8 0 248 -73 6 10 3 6 47 8 6 6 21 6 50 50 0.48 Uncertainty in time = +/- 1 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: UCAC4 339-194151 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 43 06.8192 DE: -22 14 06.570 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 43 06.8191 DE: -22 14 06.570 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (928) Hildrun asteroid class: approx. diameter [km]: 63 approx. diameter ["]: 0.023 distance from Earth [AU]: 3.72240 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): 0.008", 0.002", 93.518° remarks: * orbital elements for (928)Hildrun : Mean anomaly = 168.9328505652 deg Arg. of pericenter = 21.8565872746 deg Long. of node = 129.8358027874 deg Inclination = 17.6480729730 deg Eccentricity = 0.1471669590 Semimajor axis = 3.1353730700 AU Perihelion dist = 2.6739497500 AU Mag: H = 9.99, G = 0.15 Epoch of elements : MJD 59898.38743056 TDT (2022 Nov 15.3874) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542022Sep23,2.89,2022,11,15,9.296507,0.003547,-0.023655,12.216457,1.816414,0.005640,0.001418,0.000000,0.000000 117.2139,-22.1548,36.69,-18.52,False UCAC4 339-194151,20.71856087,-22.2351583,0.00,12.25,0.00,0.0,0,,20.74039814,-22.1547931,4.25,0.00,0,0,0 928,Hildrun,16.48,63.2,3.7224,0,0,2.078,4.29,,3.2,0 0,168.8641,2022,11,15,21.8566,129.8358,17.6481,0.14717,3.13537,2.67395,10.00,5.0,0.15 1.099,0.0080,0.0017,94,0.0023,Known errors,-1.00,-1,-1,-1 20221115_194151,59868.97 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org