IOTA/IOTA-ES occultation update for (1128) Astrid / G174221.2-241107 event on 2023 Jun 26, 10:56 UT Visible from New Zealand, Australia Summary ------- On 2023 Jun 26 UT, the 41.8 km diameter asteroid (1128) Astrid will occult a 11.2 mag star in the constellation Ophiuchus for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.37 mag to 14.52 mag (the magnitude of the asteroid) for at most 3.990 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: 2023 Jun 26, 10:46 - 2023 Jun 26, 11:06 * geocentric midpoint of event [JD]: 2460121.95583329 * magnitude of target star: 11.20 * magnitude drop [mag]: 3.37 * estimated maximum duration [s]: 3.990 * Moon: 52 % sunlit, 79° distance * Sun: 172° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 43 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.006", 89°) * approx speed of asteroid's shadow [km/s]: 10.4771 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G174221.2-241107 by 1128 Astrid on 2023 Jun 26 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 90 0 0 -11 10 37 11 6 18.3 0 115 8 .. .. .. -11 23 21 .. .. .. -11 27 33 .... 91 0 0 -11 37 51 11 6 18.2 1 114 7 -11 25 7 -11 50 35 -11 20 55 -11 54 47 0.24 92 0 0 -12 5 3 11 6 17.9 2 114 6 -11 52 20 -12 17 48 -11 48 8 -12 22 0 0.22 93 0 0 -12 32 14 11 6 17.3 3 114 5 -12 19 30 -12 44 59 -12 15 19 -12 49 11 0.22 94 0 0 -12 59 22 11 6 16.6 4 114 4 -12 46 38 -13 12 7 -12 42 27 -13 16 19 0.21 95 0 0 -13 26 27 11 6 15.6 5 114 3 -13 13 43 -13 39 12 -13 9 32 -13 43 23 0.21 96 0 0 -13 53 28 11 6 14.4 6 113 2 -13 40 44 -14 6 12 -13 36 33 -14 10 24 0.21 97 0 0 -14 20 23 11 6 13.0 7 113 1 -14 7 40 -14 33 8 -14 3 29 -14 37 20 0.21 98 0 0 -14 47 14 11 6 11.3 9 113 0 -14 34 31 -14 59 58 -14 30 19 -15 4 10 0.21 99 0 0 -15 13 58 11 6 9.5 10 113 -1 -15 1 15 -15 26 42 -14 57 4 -15 30 54 0.21 100 0 0 -15 40 36 11 6 7.5 11 112 -2 -15 27 53 -15 53 20 -15 23 42 -15 57 31 0.21 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31.7 5 246 -13 -13 25 47 -13 51 15 -13 21 35 -13 55 27 0.26 - 78 0 0 -13 11 26 10 46 30.9 4 246 -12 -12 58 42 -13 24 11 -12 54 30 -13 28 22 0.28 - 77 0 0 -12 44 17 10 46 30.3 2 246 -10 -12 31 33 -12 57 2 -12 27 22 -13 1 14 0.31 - 76 0 0 -12 17 6 10 46 29.9 1 246 -9 -12 4 22 -12 29 51 -12 0 10 -12 34 3 0.39 - 75 0 0 -11 49 52 10 46 29.7 0 245 -8 -11 37 8 -12 2 37 -11 32 57 -12 6 49 0.96 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: G174221.2-241107 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 42 21.1749 DE: -24 11 05.489 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 42 21.1749 DE: -24 11 05.489 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.200) * V mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1128) Astrid asteroid class: approx. diameter [km]: 42 approx. diameter ["]: 0.035 distance from Earth [AU]: 1.66480 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#63 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): 0.023", 0.006", 88.789° remarks: * orbital elements for (1128)Astrid : Mean anomaly = 336.9878471382 deg Arg. of pericenter = 234.7946695342 deg Long. of node = 59.4334480175 deg Inclination = 1.0123619332 deg Eccentricity = 0.0441640592 Semimajor axis = 2.7870436057 AU Perihelion dist = 2.6639564468 AU Mag: H = 10.94, G = 0.15 Epoch of elements : MJD 60121.45583333 TDT (2023 Jun 26.4558) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#632023Apr24,3.99,2023,6,26,10.939999,-0.001067,-0.215846,-5.913491,0.028851,0.000829,0.000053,0.000001,0.000000 -172.4613,-24.1967,16.62,23.36,False G174221.2-241107,17.70588192,-24.1848580,0.00,11.20,0.00,0.0,4,,17.73007123,-24.1966566,3.37,0.00,0,0,0 1128,Astrid,14.52,41.8,1.6648,0,0,-2.283,0.15,,2.2,0 0,336.8913,2023,6,26,234.7947,59.4334,1.0124,0.04416,2.78704,2.66396,10.96,5.0,0.15 1.165,0.0230,0.0057,89,0.0057,Known errors,-1.00,-1,-1,-1 20230626_241107,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org