IOTA/IOTA-ES occultation update for (476) Hedwig / UCAC4-568-037720 event on 2023 Dec 29, 04:19 UT Visible from Europe, Canad Summary ------- On 2023 Dec 29 UT, the 121.7 km diameter asteroid (476) Hedwig will occult a 12.4 mag star in the constellation Gemini for observers along a path across Europe, Canad. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.84 mag to 12.60 mag (the magnitude of the asteroid) for at most 8.940 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 Dec 29, 04:12 - 2023 Dec 29, 04:24 * geocentric midpoint of event [JD]: 2460307.67957450 * magnitude of target star: 12.44 * magnitude drop [mag]: 0.84 * estimated maximum duration [s]: 8.940 * Moon: 95 % sunlit, 15° distance * Sun: 171° distance * rough path description: Europe, Canad The occultation path -------------------- * approximate projected width [km]: 170 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.001", 108°) * approx speed of asteroid's shadow [km/s]: 13.6066 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-568-037720 by 476 Hedwig on 2023 Dec 29 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 0 0 0 .. .. .... .. .. .. .. .. .. 35 29 20 .. .. .. 35 34 27 .. .. .. .... -162 0 0 35 3 58 4 24 9.3 1 62 -8 35 56 52 34 11 58 36 2 0 34 7 1 .... -161 0 0 35 31 33 4 24 9.0 2 62 -9 36 24 36 34 39 23 36 29 45 34 34 25 -0.82 -160 0 0 35 59 19 4 24 8.6 3 63 -10 36 52 33 35 7 0 36 57 43 35 2 1 -0.87 -159 0 0 36 27 17 4 24 8.0 3 63 -11 37 20 41 35 34 49 37 25 52 35 29 49 -0.90 -158 0 0 36 55 26 4 24 7.3 4 64 -12 37 48 59 36 2 48 37 54 11 35 57 47 -0.91 -157 0 0 37 23 44 4 24 6.4 5 65 -13 38 17 27 36 30 57 38 22 40 36 25 55 -0.92 -156 0 0 37 52 11 4 24 5.3 6 65 -14 38 46 4 36 59 15 38 51 18 36 54 12 -0.93 -155 0 0 38 20 46 4 24 4.1 7 66 -15 39 14 48 37 27 41 39 20 3 37 22 37 -0.93 -154 0 0 38 49 27 4 24 2.7 8 66 -15 39 43 38 37 56 13 39 48 54 37 51 9 -0.94 -153 0 0 39 18 14 4 24 1.1 9 67 -16 40 12 34 38 24 52 40 17 51 38 19 47 -0.94 -152 0 0 39 47 6 4 23 59.4 10 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31 55 15 19 57 10 55 55 10 7 -1.00 40 0 0 55 47 22 4 13 33.5 18 286 -12 56 43 6 54 52 42 56 48 31 54 47 29 -1.00 41 0 0 55 24 29 4 13 31.2 17 287 -11 56 20 19 54 29 44 56 25 45 54 24 31 -1.00 42 0 0 55 1 16 4 13 28.9 16 288 -11 55 57 11 54 6 25 56 2 37 54 1 12 -1.00 43 0 0 54 37 41 4 13 26.7 16 288 -10 55 33 41 53 42 46 55 39 8 53 37 32 -1.00 44 0 0 54 13 46 4 13 24.5 15 289 -9 55 9 51 53 18 46 55 15 18 53 13 32 -1.01 45 0 0 53 49 31 4 13 22.5 14 290 -9 54 45 39 52 54 27 54 51 7 52 49 12 -1.01 46 0 0 53 24 55 4 13 20.5 14 291 -8 54 21 8 52 29 48 54 26 36 52 24 33 -1.01 47 0 0 53 0 0 4 13 18.6 13 292 -7 53 56 16 52 4 50 54 1 44 51 59 35 -1.01 48 0 0 52 34 46 4 13 16.7 12 293 -6 53 31 5 51 39 33 53 36 33 51 34 17 -1.02 49 0 0 52 9 13 4 13 15.0 11 293 -6 53 5 34 51 13 58 53 11 3 51 8 42 -1.02 50 0 0 51 43 22 4 13 13.3 11 294 -5 52 39 45 50 48 5 52 45 14 50 42 49 -1.02 51 0 0 51 17 14 4 13 11.7 10 295 -4 52 13 38 50 21 55 52 19 7 50 16 39 -1.03 52 0 0 50 50 48 4 13 10.3 9 296 -3 51 47 13 49 55 28 51 52 42 49 50 12 -1.03 53 0 0 50 24 6 4 13 8.9 8 297 -3 51 20 31 49 28 46 51 26 1 49 23 30 -1.04 54 0 0 49 57 7 4 13 7.6 8 297 -2 50 53 33 49 1 47 50 59 2 48 56 31 -1.05 55 0 0 49 29 54 4 13 6.5 7 298 -1 50 26 19 48 34 34 50 31 48 48 29 18 -1.06 56 0 0 49 2 26 4 13 5.4 6 299 0 49 58 50 48 7 7 50 4 19 48 1 51 -1.07 57 0 0 48 34 44 4 13 4.5 5 300 0 49 31 7 47 39 26 49 36 36 47 34 10 -1.08 58 0 0 48 6 49 4 13 3.7 4 300 1 49 3 10 47 11 33 49 8 38 47 6 17 -1.11 59 0 0 47 38 41 4 13 3.0 4 301 2 48 35 0 46 43 28 48 40 28 46 38 12 -1.14 60 0 0 47 10 22 4 13 2.4 3 302 3 48 6 38 46 15 11 48 12 6 46 9 56 -1.19 61 0 0 46 41 52 4 13 2.0 2 303 4 47 38 5 45 46 44 47 43 33 45 41 29 -1.29 62 0 0 46 13 12 4 13 1.7 1 303 5 47 9 21 45 18 8 47 14 49 45 12 53 -1.53 63 0 0 45 44 24 4 13 1.6 0 304 5 46 40 28 .. .. .. 46 45 55 .. .. .. -3.10 0 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 46 16 53 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Nov 13.9 Data for the target star ------------------------ * name: UCAC4-568-037720 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 10 38.5507 DE: +23 24 02.640 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 10 38.5507 DE: +23 24 02.640 * position source: Gaia DR3 * 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: (476) Hedwig asteroid class: ShapeModel approx. diameter [km]: 122 approx. diameter ["]: 0.090 distance from Earth [AU]: 1.87170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#127 date of fit: 2023 Oct 09 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): 0.010", 0.001", 108.016° remarks: * orbital elements for (476)Hedwig : Mean anomaly = 175.1902788841 deg Arg. of pericenter = 0.8693660150 deg Long. of node = 286.1829870143 deg Inclination = 10.9251236382 deg Eccentricity = 0.0747842493 Semimajor axis = 2.6489450941 AU Perihelion dist = 2.4508457239 AU Mag: H = 8.75, G = 0.15 Epoch of elements : MJD 60307.17993056 TDT (2023 Dec 29.1799) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1272023Oct09,8.94,2023,12,29,4.309788,-0.076938,0.695707,-7.633422,-0.844288,-0.000982,0.000021,0.000001,0.000000 -53.9903,23.3614,115.79,-23.24,False UCAC4-568-037720,7.17737520,23.4007333,0.00,12.44,0.00,0.0,0,,7.20185306,23.3613705,0.84,0.00,0,0,0 476,Hedwig,12.60,121.700,1.8717,0,0,-2.604,-3.97,,6.8,0 0,175.1491,2023,12,29,0.8694,286.1830,10.9251,0.07478,2.64895,2.45085,8.65,5.0,0.15 1.048,0.0103,0.0007,108,0.0104,Known errors,-1.00,0,-1,-1 20231229_037720,60261.88 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Nov 13, 21:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org