IOTA/IOTA-ES occultation update for (54) Alexandra / UCAC4 641-018866 event on 2024 Nov 06, 05:47 UT Visible from Summary ------- On 2024 Nov 06 UT, the 152.069161108121 km diameter asteroid (54) Alexandra will occult a 11.1 mag star in the constellation Perseus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.58 mag to 12.43 mag (the magnitude of the asteroid) for at most 13.760 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: 2024 Nov 06, 05:38 - 2024 Nov 06, 05:56 * geocentric midpoint of event [JD]: 2460620.74135971 * magnitude of target star: 11.14 * magnitude drop [mag]: 1.58 * estimated maximum duration [s]: 13.760 * Moon: 21 % sunlit, 153° distance * Sun: 147° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 171 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 87°) * approx speed of asteroid's shadow [km/s]: 11.0725 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 641-018866 by 54 Alexandra on 2024 Nov 6 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 -174 0 0 .. .. .... .. .. .. .. .. .. 22 25 19 .. .. .. 22 27 32 .. .. .. .... -173 0 0 22 13 36 5 56 5.9 1 49 -15 23 15 36 21 12 19 23 17 49 21 10 9 .... -172 0 0 23 3 45 5 56 5.5 2 49 -16 24 5 58 22 2 16 24 8 11 22 0 6 -0.45 -171 0 0 23 53 57 5 56 4.7 4 49 -17 24 56 22 22 52 17 24 58 36 22 50 6 -0.46 -170 0 0 24 44 11 5 56 3.7 5 50 -18 25 46 47 23 42 20 25 49 2 23 40 8 -0.47 -169 0 0 25 34 23 5 56 2.4 6 50 -19 26 37 10 24 32 22 26 39 25 24 30 10 -0.47 -168 0 0 26 24 32 5 56 0.8 7 51 -20 27 27 28 25 22 21 27 29 44 25 20 9 -0.47 -167 0 0 27 14 34 5 55 58.9 8 51 -21 28 17 40 26 12 15 28 19 56 26 10 3 -0.48 -166 0 0 28 4 29 5 55 56.8 10 52 -22 29 7 43 27 2 1 29 9 59 26 59 49 -0.48 -165 0 0 28 54 13 5 55 54.3 11 52 -23 29 57 34 27 51 38 29 59 50 27 49 25 -0.48 -164 0 0 29 43 43 5 55 51.7 12 53 -24 30 47 11 28 41 3 30 49 28 28 38 50 -0.48 -163 0 0 30 32 59 5 55 48.7 13 53 -25 31 36 33 29 30 14 31 38 49 29 28 0 -0.48 -162 0 0 31 21 58 5 55 45.6 14 54 -26 32 25 36 30 19 8 32 27 52 30 16 55 -0.48 -161 0 0 32 10 37 5 55 42.1 15 54 -27 33 14 19 31 7 44 33 16 36 31 5 30 -0.48 -160 0 0 32 58 55 5 55 38.5 17 55 -28 34 2 39 31 55 59 34 4 56 31 53 46 -0.48 -159 0 0 33 46 50 5 55 34.7 18 55 -29 34 50 36 32 43 52 34 52 53 32 41 38 -0.48 -158 0 0 34 34 19 5 55 30.6 19 56 -29 35 38 6 33 31 21 35 40 23 33 29 7 -0.48 -157 0 0 35 21 21 5 55 26.4 20 57 -30 36 25 8 34 18 23 36 27 25 34 16 10 -0.49 -156 0 0 36 7 55 5 55 22.0 21 57 -31 37 11 40 35 4 58 37 13 58 35 2 44 -0.49 -155 0 0 36 53 58 5 55 17.4 22 58 -32 37 57 42 35 51 3 37 59 58 35 48 49 -0.49 -154 0 0 37 39 29 5 55 12.6 23 59 -32 38 43 10 36 36 37 38 45 26 36 34 23 -0.49 -153 0 0 38 24 26 5 55 7.7 24 59 -33 39 28 3 37 21 38 39 30 20 37 19 25 -0.49 -152 0 0 39 8 49 5 55 2.6 25 60 -34 40 12 21 38 6 6 40 14 38 38 3 53 -0.49 -151 0 0 39 52 36 5 54 57.5 26 61 -35 40 56 2 38 49 58 40 58 19 38 47 45 -0.49 -150 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0 34 19 49 5 39 40.0 20 303 13 35 23 34 33 16 53 35 25 51 33 14 39 -0.51 30 0 0 33 32 15 5 39 35.7 19 304 14 34 35 59 32 29 20 34 38 16 32 27 6 -0.51 31 0 0 32 44 17 5 39 31.6 18 305 15 33 47 59 31 41 23 33 50 16 31 39 10 -0.51 32 0 0 31 55 56 5 39 27.8 16 305 16 32 59 34 30 53 5 33 1 51 30 50 52 -0.52 33 0 0 31 7 14 5 39 24.2 15 306 17 32 10 49 30 4 27 32 13 5 30 2 14 -0.52 34 0 0 30 18 14 5 39 20.8 14 306 18 31 21 43 29 15 31 31 24 0 29 13 18 -0.52 35 0 0 29 28 57 5 39 17.6 13 307 19 30 32 21 28 26 20 30 34 37 28 24 7 -0.52 36 0 0 28 39 26 5 39 14.7 12 307 20 29 42 43 27 36 55 29 44 59 27 34 43 -0.53 37 0 0 27 49 42 5 39 12.1 11 308 22 28 52 52 26 47 19 28 55 8 26 45 7 -0.53 38 0 0 26 59 49 5 39 9.7 9 308 23 28 2 50 25 57 34 28 5 6 25 55 22 -0.54 39 0 0 26 9 49 5 39 7.6 8 309 24 27 12 40 25 7 43 27 14 56 25 5 31 -0.55 40 0 0 25 19 43 5 39 5.7 7 309 25 26 22 24 24 17 46 26 24 39 24 15 35 -0.56 41 0 0 24 29 34 5 39 4.2 6 310 26 25 32 5 23 27 48 25 34 19 23 25 37 -0.57 42 0 0 23 39 25 5 39 2.9 4 310 28 24 41 44 22 37 50 24 43 58 22 35 39 -0.60 43 0 0 22 49 17 5 39 2.0 3 310 29 23 51 24 21 47 54 23 53 37 21 45 44 -0.64 44 0 0 21 59 14 5 39 1.3 2 311 30 23 1 7 20 58 3 23 3 20 20 55 53 -0.74 45 0 0 21 9 17 5 39 0.9 1 311 31 22 10 57 20 8 19 22 13 9 20 6 10 -1.17 46 0 0 .. .. .... .. .. .. .. .. .. 21 20 54 .. .. .. 21 23 6 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 641-018866 * constellation : Perseus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 34 51.1807 DE: +38 10 43.276 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 34 51.1807 DE: +38 10 43.276 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.1 * B mag [mag]: 12.5 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (54) Alexandra asteroid class: approx. diameter [km]: 152 approx. diameter ["]: 0.102 distance from Earth [AU]: 2.04640 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#193 date of fit: 2023 Apr 24 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): 0.013", 0.002", 86.559° remarks: * orbital elements for (54)Alexandra : Mean anomaly = 103.6781322048 deg Arg. of pericenter = 345.6697403726 deg Long. of node = 313.1579606122 deg Inclination = 11.7963644399 deg Eccentricity = 0.1969209233 Semimajor axis = 2.7134840605 AU Perihelion dist = 2.1791422741 AU Mag: H = 7.87, G = 0.15 Epoch of elements : MJD 60620.24135792 TDT (2024 Nov 06.2414) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1932023Apr24,13.76,2024,11,6,5.792633,0.004691,0.455358,-6.249279,0.064190,-0.002581,-0.001831,0.000001,0.000000 -63.6919,38.2307,89.02,-16.13,False UCAC4 641-018866,4.58088352,38.1786878,12.50,11.14,10.41,0.2,0,,4.60920676,38.2306681,1.58,1.80,0,0,0 54,Alexandra,12.43,152.366,2.0464,0,0,-2.279,0.27,,7.6,0 0,103.6249,2024,11,6,345.6697,313.1580,11.7964,0.19692,2.71348,2.17914,7.87,5.0,0.15 1.018,0.0130,0.0016,87,0.0018,Known errors,1.06,0,-1,-1 20241106_018866,60140.68 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org