IOTA/IOTA-ES occultation update for (41) Daphne / UCAC4 398-082606 event on 2022 Oct 18, 10:44 UT Visible from N Australia Summary ------- On 2022 Oct 18 UT, the 187.4 km diameter asteroid (41) Daphne will occult a 12.4 mag star in the constellation Scutum for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.84 mag to 12.51 mag (the magnitude of the asteroid) for at most 6.100 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 Oct 18, 10:40 - 2022 Oct 18, 10:47 * geocentric midpoint of event [JD]: 2459870.94725375 * magnitude of target star: 12.35 * magnitude drop [mag]: 0.84 * estimated maximum duration [s]: 6.100 * Moon: 44 % sunlit, 149° distance * Sun: 73° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 187 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.038, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.038", 0.003", 90°) * approx speed of asteroid's shadow [km/s]: 30.7109 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 398-082606 by 41 Daphne #1 on 2022 Oct 18 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 3 0 0 11 48 13 10 40 34.6 1 101 65 10 56 28 12 39 59 10 52 0 12 44 28 .... 4 0 0 11 36 50 10 40 34.7 2 101 66 10 45 3 12 28 38 10 40 35 12 33 6 0.03 5 0 0 11 25 14 10 40 34.8 3 101 66 10 33 25 12 17 4 10 28 57 12 21 32 0.01 6 0 0 11 13 26 10 40 35.1 4 101 67 10 21 35 12 5 18 10 17 7 12 9 47 0.00 7 0 0 11 1 27 10 40 35.3 5 102 67 10 9 34 11 53 20 10 5 5 11 57 49 0.00 8 0 0 10 49 16 10 40 35.6 6 102 68 9 57 21 11 41 11 9 52 52 11 45 40 0.00 9 0 0 10 36 53 10 40 36.0 7 102 69 9 44 56 11 28 51 9 40 27 11 33 20 -0.01 10 0 0 10 24 19 10 40 36.5 8 102 69 9 32 21 11 16 19 9 27 51 11 20 48 -0.01 11 0 0 10 11 35 10 40 37.0 9 102 70 9 19 34 11 3 36 9 15 5 11 8 5 -0.01 12 0 0 9 58 39 10 40 37.6 10 103 70 9 6 36 10 50 42 9 2 7 10 55 12 -0.01 13 0 0 9 45 33 10 40 38.3 11 103 70 8 53 28 10 37 38 8 48 59 10 42 8 -0.01 14 0 0 9 32 16 10 40 39.0 12 103 71 8 40 10 10 24 23 8 35 40 10 28 53 -0.01 15 0 0 9 18 50 10 40 39.8 13 103 71 8 26 42 10 10 58 8 22 12 10 15 28 -0.01 16 0 0 9 5 13 10 40 40.6 14 103 71 8 13 3 9 57 24 8 8 33 10 1 54 -0.01 17 0 0 8 51 27 10 40 41.5 15 103 71 7 59 15 9 43 39 7 54 45 9 48 10 -0.01 18 0 0 8 37 31 10 40 42.5 16 103 72 7 45 18 9 29 45 7 40 47 9 34 16 -0.01 19 0 0 8 23 26 10 40 43.5 17 104 72 7 31 11 9 15 42 7 26 41 9 20 13 -0.01 20 0 0 8 9 12 10 40 44.7 18 104 72 7 16 56 9 1 30 7 12 25 9 6 1 -0.01 21 0 0 7 54 50 10 40 45.8 19 104 72 7 2 31 8 47 9 6 58 1 8 51 40 -0.01 22 0 0 7 40 19 10 40 47.1 20 104 72 6 47 59 8 32 40 6 43 28 8 37 11 -0.01 23 0 0 7 25 40 10 40 48.4 21 104 72 6 33 18 8 18 2 6 28 47 8 22 33 -0.01 24 0 0 7 10 53 10 40 49.7 22 104 71 6 18 30 8 3 17 6 13 59 8 7 48 -0.01 25 0 0 6 55 58 10 40 51.1 23 104 71 6 3 34 7 48 23 5 59 2 7 52 55 -0.01 26 0 0 6 40 56 10 40 52.6 24 105 71 5 48 31 7 33 23 5 43 59 7 37 55 -0.01 27 0 0 6 25 47 10 40 54.2 25 105 71 5 33 20 7 18 16 5 28 49 7 22 47 -0.01 28 0 0 6 10 32 10 40 55.8 26 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11 14 -0.02 164 0 0 -11 59 28 10 47 21.8 16 262 -53 -12 50 42 -11 8 12 -12 55 8 -11 3 47 -0.02 165 0 0 -11 51 48 10 47 22.7 15 262 -54 -12 43 4 -11 0 31 -12 47 30 -10 56 6 -0.02 166 0 0 -11 43 54 10 47 23.6 14 262 -55 -12 35 12 -10 52 36 -12 39 38 -10 48 10 -0.02 167 0 0 -11 35 46 10 47 24.5 13 262 -55 -12 27 5 -10 44 26 -12 31 31 -10 40 0 -0.02 168 0 0 -11 27 23 10 47 25.3 12 262 -56 -12 18 45 -10 36 1 -12 23 10 -10 31 35 -0.02 169 0 0 -11 18 47 10 47 26.0 11 261 -57 -12 10 10 -10 27 23 -12 14 36 -10 22 57 -0.02 170 0 0 -11 9 56 10 47 26.6 10 261 -58 -12 1 21 -10 18 31 -12 5 47 -10 14 4 -0.02 171 0 0 -11 0 52 10 47 27.2 9 261 -59 -11 52 18 -10 9 25 -11 56 45 -10 4 58 -0.01 172 0 0 -10 51 34 10 47 27.8 8 261 -60 -11 43 2 -10 0 5 -11 47 29 - 9 55 38 -0.01 173 0 0 -10 42 3 10 47 28.3 7 261 -61 -11 33 33 - 9 50 32 -11 37 59 - 9 46 5 -0.01 174 0 0 -10 32 18 10 47 28.7 6 260 -61 -11 23 50 - 9 40 45 -11 28 16 - 9 36 18 -0.01 175 0 0 -10 22 20 10 47 29.0 5 260 -62 -11 13 54 - 9 30 45 -11 18 21 - 9 26 18 -0.01 176 0 0 -10 12 9 10 47 29.3 4 260 -63 -11 3 44 - 9 20 32 -11 8 11 - 9 16 5 -0.01 177 0 0 -10 1 45 10 47 29.5 3 260 -64 -10 53 22 - 9 10 7 -10 57 50 - 9 5 39 0.00 178 0 0 - 9 51 8 10 47 29.7 2 260 -65 -10 42 48 - 8 59 28 -10 47 15 - 8 55 1 0.01 179 0 0 - 9 40 19 10 47 29.8 1 260 -65 -10 32 0 - 8 48 37 -10 36 28 - 8 44 9 0.03 180 0 0 - 9 29 18 10 47 29.8 0 259 -66 -10 21 1 .. .. .. -10 25 28 .. .. .. 0.87 Uncertainty in time = +/- 1 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: UCAC4 398-082606 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 27 08.5961 DE: -10 27 46.659 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 27 08.5961 DE: -10 27 46.659 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (41) Daphne asteroid class: ShapeModel asteroid system: multiple bodies approx. diameter [km]: 187 approx. diameter ["]: 0.104 distance from Earth [AU]: 2.49410 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#144 date of fit: 2022 Sep 21 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", 0.002", 89.607° remarks: * orbital elements for (41)Daphne : Mean anomaly = 47.2076295384 deg Arg. of pericenter = 45.9298648067 deg Long. of node = 178.0554745519 deg Inclination = 15.7898714965 deg Eccentricity = 0.2744108487 Semimajor axis = 2.7607812668 AU Perihelion dist = 2.0031929364 AU Mag: H = 7.53, G = 0.10 Epoch of elements : MJD 59870.44722222 TDT (2022 Oct 18.4472) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1442022Sep21 Binary solution 1 : Kepler,6.10,2022,10,18,10.734090,0.006442,0.020898,17.025921,-3.253990,0.005346,0.000645,0.000000,0.000000 89.1790,-10.4486,15.28,-9.69,False UCAC4 398-082606,18.45238783,-10.4629607,0.00,12.35,0.00,0.0,0,,18.47304869,-10.4485917,0.84,0.00,0,0,0 41,Daphne #1,12.51,187.4,2.4941,0,1,4.070,-11.47,,9.3,0 Peneius,2,443,1.100000,,,,,, 0,47.1115,2022,10,18,45.9299,178.0555,15.7899,0.27441,2.76078,2.00319,7.53,5.0,0.15 1.043,0.0210,0.0019,90,0.0045,Known errors + binary orbit,-1.00,-1,-1,-1 20221018_082606_Ma1,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org