IOTA/IOTA-ES occultation update for (1247) Memoria / UCAC4 537-046799 event on 2024 Jan 21, 15:39 UT Visible from Summary ------- On 2024 Jan 21 UT, the 36.749 km diameter asteroid (1247) Memoria will occult a 11.1 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.67 mag to 15.80 mag (the magnitude of the asteroid) for at most 2.290 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: 99 * date and approx. time of event: 2024 Jan 21, 15:33 - 2024 Jan 21, 15:44 * geocentric midpoint of event [JD]: 2460331.15209954 * magnitude of target star: 11.14 * magnitude drop [mag]: 4.67 * estimated maximum duration [s]: 2.290 * Moon: 84 % sunlit, 52° distance * Sun: 175° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 103°) * approx speed of asteroid's shadow [km/s]: 16.0170 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 537-046799 by 1247 Memoria on 2024 Jan 21 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 46 0 0 -12 34 48 15 44 51.2 0 72 -4 -12 22 52 -12 46 46 -12 19 43 -12 49 56 .... 47 0 0 -12 16 19 15 44 51.0 1 72 -5 -12 4 23 -12 28 15 -12 1 15 -12 31 24 0.28 48 0 0 -11 58 12 15 44 50.8 2 72 -6 -11 46 18 -12 10 7 -11 43 10 -12 13 16 0.39 49 0 0 -11 40 28 15 44 50.3 4 72 -7 -11 28 36 -11 52 22 -11 25 28 -11 55 30 0.44 50 0 0 -11 23 8 15 44 49.8 5 71 -8 -11 11 17 -11 35 0 -11 8 10 -11 38 8 0.47 51 0 0 -11 6 11 15 44 49.1 6 71 -9 -10 54 21 -11 18 2 -10 51 15 -11 21 10 0.48 52 0 0 -10 49 38 15 44 48.2 7 71 -10 -10 37 50 -11 1 28 -10 34 43 -11 4 35 0.49 53 0 0 -10 33 29 15 44 47.2 8 71 -11 -10 21 42 -10 45 18 -10 18 36 -10 48 25 0.50 54 0 0 -10 17 45 15 44 46.1 9 71 -12 -10 5 59 -10 29 32 -10 2 53 -10 32 38 0.51 55 0 0 -10 2 25 15 44 44.9 10 70 -13 - 9 50 40 -10 14 11 - 9 47 35 -10 17 17 0.51 56 0 0 - 9 47 29 15 44 43.5 11 70 -14 - 9 35 46 - 9 59 14 - 9 32 41 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-11 -34 37 26 -35 2 44 -34 34 6 -35 6 5 0.56 -169 0 0 -35 13 59 15 33 27.6 15 304 -10 -35 1 21 -35 26 39 -34 58 2 -35 29 59 0.56 -168 0 0 -35 37 43 15 33 25.9 14 304 -9 -35 25 5 -35 50 22 -35 21 46 -35 53 42 0.56 -167 0 0 -36 1 15 15 33 24.2 13 303 -8 -35 48 38 -36 13 53 -35 45 18 -36 17 13 0.56 -166 0 0 -36 24 34 15 33 22.6 12 303 -7 -36 11 58 -36 37 12 -36 8 39 -36 40 32 0.56 -165 0 0 -36 47 41 15 33 21.2 12 302 -6 -36 35 5 -37 0 19 -36 31 47 -37 3 38 0.56 -164 0 0 -37 10 35 15 33 19.9 11 301 -5 -36 58 0 -37 23 11 -36 54 41 -37 26 31 0.56 -163 0 0 -37 33 15 15 33 18.6 10 301 -5 -37 20 41 -37 45 51 -37 17 22 -37 49 10 0.56 -162 0 0 -37 55 41 15 33 17.5 9 300 -4 -37 43 7 -38 8 16 -37 39 49 -38 11 35 0.56 -161 0 0 -38 17 52 15 33 16.5 8 299 -3 -38 5 20 -38 30 27 -38 2 2 -38 33 46 0.57 -160 0 0 -38 39 49 15 33 15.6 7 299 -2 -38 27 17 -38 52 23 -38 24 0 -38 55 41 0.57 -159 0 0 -39 1 31 15 33 14.8 6 298 -1 -38 49 0 -39 14 3 -38 45 43 -39 17 22 0.57 -158 0 0 -39 22 57 15 33 14.2 5 298 0 -39 10 27 -39 35 28 -39 7 10 -39 38 46 0.57 -157 0 0 -39 44 7 15 33 13.6 5 297 1 -39 31 38 -39 56 37 -39 28 21 -39 59 55 0.57 -156 0 0 -40 5 1 15 33 13.1 4 296 1 -39 52 33 -40 17 30 -39 49 17 -40 20 48 0.58 -155 0 0 -40 25 39 15 33 12.7 3 296 2 -40 13 12 -40 38 7 -40 9 56 -40 41 24 0.58 -154 0 0 -40 46 0 15 33 12.5 2 295 3 -40 33 34 -40 58 27 -40 30 18 -41 1 44 0.59 -153 0 0 -41 6 3 15 33 12.3 1 294 4 -40 53 39 -41 18 29 -40 50 23 -41 21 46 0.61 -152 0 0 -41 25 50 15 33 12.2 0 294 5 -41 13 27 -41 38 15 -41 10 11 -41 41 31 0.72 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: UCAC4 537-046799 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 31 45.7897 DE: +17 21 53.618 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 31 45.7897 DE: +17 21 53.618 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.1 * B mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1247) Memoria asteroid class: approx. diameter [km]: 37 approx. diameter ["]: 0.019 distance from Earth [AU]: 2.69570 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 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): 0.017", 0.002", 102.522° remarks: * orbital elements for (1247)Memoria : Mean anomaly = 186.1278959066 deg Arg. of pericenter = 138.4934872529 deg Long. of node = 161.6880829894 deg Inclination = 1.7816921319 deg Eccentricity = 0.1759097415 Semimajor axis = 3.1285325624 AU Perihelion dist = 2.5781932082 AU Mag: H = 10.63, G = 0.15 Epoch of elements : MJD 60330.65209942 TDT (2024 Jan 21.6521) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,2.29,2024,1,21,15.650389,-0.125940,-0.460617,-8.720619,2.383424,-0.000473,0.000278,0.000001,0.000000 133.0239,17.2829,-51.95,-19.92,False UCAC4 537-046799,8.52938603,17.3648939,11.33,11.14,11.04,0.0,0,,8.55245779,17.2829438,4.68,4.34,0,0,0 1247,Memoria,15.80,36.749,2.6957,0,0,-1.986,7.77,,2.4,0 0,186.0117,2024,1,21,138.4935,161.6881,1.7817,0.17591,3.12853,2.57819,10.63,5.0,0.15 1.132,0.0170,0.0023,103,0.0025,Known errors,1.11,0,-1,-1 20240121_046799,60137.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org