IOTA/IOTA-ES occultation update for (54) Alexandra / TYC 6328-01085-1 event on 2023 Oct 28, 23:20 UT Visible from South America Summary ------- On 2023 Oct 28 UT, the 152.1 km diameter asteroid (54) Alexandra will occult a 8.8 mag star in the constellation Capricornus for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.61 mag to 12.34 mag (the magnitude of the asteroid) for at most 7.250 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 Oct 28, 23:15 - 2023 Oct 28, 23:25 * geocentric midpoint of event [JD]: 2460246.47261692 * magnitude of target star: 8.77 * magnitude drop [mag]: 3.61 * estimated maximum duration [s]: 7.250 * Moon: 100 % sunlit, 93° distance * Sun: 89° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 158 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.001", 63°) * approx speed of asteroid's shadow [km/s]: 20.9656 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6328-01085-1 by 54 Alexandra on 2023 Oct 28 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 -172 0 0 - 5 40 45 23 15 40.6 0 106 82 - 6 25 0 .. .. .. - 6 26 29 .. .. .. .... -171 0 0 - 5 57 16 23 15 40.7 1 105 82 - 6 41 26 - 5 12 56 - 6 42 54 - 5 11 27 -0.07 -170 0 0 - 6 13 20 23 15 40.8 2 105 82 - 6 57 25 - 5 29 5 - 6 58 54 - 5 27 36 -0.16 -169 0 0 - 6 28 58 23 15 41.1 3 105 82 - 7 12 59 - 5 44 47 - 7 14 27 - 5 43 18 -0.20 -168 0 0 - 6 44 9 23 15 41.5 4 105 82 - 7 28 6 - 6 0 3 - 7 29 34 - 5 58 34 -0.22 -167 0 0 - 6 58 54 23 15 42.0 5 105 81 - 7 42 46 - 6 14 52 - 7 44 14 - 6 13 23 -0.23 -166 0 0 - 7 13 11 23 15 42.5 6 105 81 - 7 56 59 - 6 29 14 - 7 58 27 - 6 27 46 -0.23 -165 0 0 - 7 27 2 23 15 43.2 7 105 80 - 8 10 46 - 6 43 9 - 8 12 14 - 6 41 41 -0.24 -164 0 0 - 7 40 26 23 15 44.0 8 105 79 - 8 24 6 - 6 56 37 - 8 25 33 - 6 55 9 -0.24 -163 0 0 - 7 53 23 23 15 44.8 9 105 79 - 8 36 58 - 7 9 38 - 8 38 26 - 7 8 10 -0.25 -162 0 0 - 8 5 52 23 15 45.8 10 104 78 - 8 49 24 - 7 22 11 - 8 50 51 - 7 20 43 -0.25 -161 0 0 - 8 17 54 23 15 46.8 11 104 77 - 9 1 22 - 7 34 16 - 9 2 49 - 7 32 49 -0.25 -160 0 0 - 8 29 28 23 15 48.0 12 104 76 - 9 12 52 - 7 45 54 - 9 14 19 - 7 44 26 -0.25 -159 0 0 - 8 40 34 23 15 49.2 13 104 75 - 9 23 55 - 7 57 4 - 9 25 22 - 7 55 36 -0.26 -158 0 0 - 8 51 13 23 15 50.6 14 104 75 - 9 34 30 - 8 7 46 - 9 35 57 - 8 6 18 -0.26 -157 0 0 - 9 1 23 23 15 52.0 15 104 74 - 9 44 38 - 8 18 0 - 9 46 4 - 8 16 33 -0.26 -156 0 0 - 9 11 6 23 15 53.5 16 104 73 - 9 54 17 - 8 27 46 - 9 55 44 - 8 26 18 -0.26 -155 0 0 - 9 20 21 23 15 55.1 17 103 72 -10 3 29 - 8 37 3 -10 4 55 - 8 35 36 -0.26 -154 0 0 - 9 29 7 23 15 56.8 18 103 71 -10 12 13 - 8 45 53 -10 13 39 - 8 44 26 -0.26 -153 0 0 - 9 37 25 23 15 58.6 19 103 70 -10 20 28 - 8 54 14 -10 21 54 - 8 52 47 -0.26 -152 0 0 - 9 45 15 23 16 0.5 20 103 69 -10 28 16 - 9 2 6 -10 29 42 - 9 0 39 -0.26 -151 0 0 - 9 52 37 23 16 2.5 21 103 68 -10 35 35 - 9 9 30 -10 37 1 - 9 8 3 -0.26 -150 0 0 - 9 59 30 23 16 4.5 22 103 67 -10 42 26 - 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5 0 0 34 53 4 23 25 27.1 1 251 -67 34 7 59 35 38 19 34 6 29 35 39 50 -0.27 0 0 0 .. .. .... .. .. .. .. .. .. 34 25 14 .. .. .. 34 23 44 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: TYC 6328-01085-1 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 20 12.1863 DE: -15 35 52.778 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 20 12.1861 DE: -15 35 52.779 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 8.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (54) Alexandra asteroid class: approx. diameter [km]: 152 approx. diameter ["]: 0.104 distance from Earth [AU]: 2.02210 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#196 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): 0.014", 0.001", 62.871° remarks: * orbital elements for (54)Alexandra : Mean anomaly = 21.3870077627 deg Arg. of pericenter = 345.3024851584 deg Long. of node = 313.2297892621 deg Inclination = 11.7969930553 deg Eccentricity = 0.1966875328 Semimajor axis = 2.7105797733 AU Perihelion dist = 2.1774425253 AU Mag: H = 8.00, G = 0.15 Epoch of elements : MJD 60245.97270833 TDT (2023 Oct 28.9727) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1962023Oct09,7.25,2023,10,28,23.342806,-0.094999,0.246410,11.037991,4.265755,0.005378,0.001283,0.000000,0.000000 -81.8003,-15.5237,-174.20,-13.28,False TYC 6328-01085-1,20.33671845,-15.5979939,0.00,8.77,0.00,0.0,0,,20.35892490,-15.5236708,3.61,0.00,0,0,0 54,Alexandra,12.34,152.100,2.0221,0,0,3.322,18.56,,7.6,0 0,21.1722,2023,10,28,345.3025,313.2298,11.7970,0.19669,2.71058,2.17744,7.87,5.0,0.15 1.017,0.0143,0.0009,63,0.0144,Known errors,-1.00,0,-1,-1 20231028_1085-1,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org