IOTA/IOTA-ES occultation update for (683) Lanzia / UCAC4-328-064630 event on 2023 Feb 26, 14:48 UT Visible from New Zealand, Australia Summary ------- On 2023 Feb 26 UT, the 109.4 km diameter asteroid (683) Lanzia will occult a 12.5 mag star in the constellation Crater 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 1.27 mag to 13.35 mag (the magnitude of the asteroid) for at most 10.210 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 Feb 26, 14:39 - 2023 Feb 26, 14:58 * geocentric midpoint of event [JD]: 2460002.11730338 * magnitude of target star: 12.48 * magnitude drop [mag]: 1.27 * estimated maximum duration [s]: 10.210 * Moon: 43 % sunlit, 118° distance * Sun: 146° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 114 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.030, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.032", 0.006", 113°) * approx speed of asteroid's shadow [km/s]: 10.7111 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-328-064630 by 683 Lanzia on 2023 Feb 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 53 0 0 -11 9 29 14 58 27.5 0 115 -3 .. .. .. -11 43 27 .. .. .. -11 54 15 .... 54 0 0 -11 37 14 14 58 27.3 1 115 -3 -11 3 20 -12 11 13 -10 52 36 -12 22 2 0.27 55 0 0 -12 5 2 14 58 27.0 2 115 -4 -11 31 8 -12 39 3 -11 20 23 -12 49 52 0.27 56 0 0 -12 32 54 14 58 26.4 3 114 -5 -11 58 58 -13 6 56 -11 48 13 -13 17 46 0.27 57 0 0 -13 0 48 14 58 25.6 4 114 -6 -12 26 51 -13 34 51 -12 16 6 -13 45 41 0.27 58 0 0 -13 28 44 14 58 24.6 5 114 -7 -12 54 46 -14 2 48 -12 44 0 -14 13 38 0.27 59 0 0 -13 56 41 14 58 23.4 7 114 -8 -13 22 42 -14 30 46 -13 11 56 -14 41 36 0.27 60 0 0 -14 24 38 14 58 22.0 8 113 -9 -13 50 39 -14 58 43 -13 39 52 -15 9 34 0.27 61 0 0 -14 52 34 14 58 20.3 9 113 -10 -14 18 34 -15 26 40 -14 7 48 -15 37 32 0.27 62 0 0 -15 20 30 14 58 18.5 10 113 -10 -14 46 29 -15 54 36 -14 35 42 -16 5 27 0.27 63 0 0 -15 48 23 14 58 16.4 11 113 -11 -15 14 22 -16 22 30 -15 3 35 -16 33 21 0.27 64 0 0 -16 16 13 14 58 14.1 12 112 -12 -15 42 12 -16 50 20 -15 31 25 -17 1 12 0.27 65 0 0 -16 44 0 14 58 11.7 13 112 -13 -16 9 59 -17 18 7 -15 59 12 -17 28 59 0.27 66 0 0 -17 11 43 14 58 9.0 14 112 -14 -16 37 42 -17 45 50 -16 26 55 -17 56 41 0.27 67 0 0 -17 39 21 14 58 6.2 15 111 -15 -17 5 20 -18 13 28 -16 54 34 -18 24 19 0.27 68 0 0 -18 6 54 14 58 3.2 16 111 -15 -17 32 53 -18 41 0 -17 22 7 -18 51 51 0.27 69 0 0 -18 34 20 14 57 59.9 17 111 -16 -18 0 20 -19 8 26 -17 49 34 -19 19 17 0.27 70 0 0 -19 1 40 14 57 56.5 18 110 -17 -18 27 41 -19 35 45 -18 16 54 -19 46 36 0.27 71 0 0 -19 28 52 14 57 53.0 19 110 -18 -18 54 53 -20 2 57 -18 44 7 -20 13 47 0.27 72 0 0 -19 55 56 14 57 49.2 20 110 -18 -19 21 58 -20 30 0 -19 11 12 -20 40 50 0.27 73 0 0 -20 22 52 14 57 45.3 21 109 -19 -19 48 55 -20 56 54 -19 38 9 -21 7 44 0.27 74 0 0 -20 49 38 14 57 41.2 22 109 -20 -20 15 42 -21 23 39 -20 4 57 -21 34 29 0.27 75 0 0 -21 16 14 14 57 36.9 23 109 -21 -20 42 19 -21 50 14 -20 31 35 -22 1 4 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0 0 -20 50 23 14 39 26.6 7 246 14 -20 16 24 -21 24 29 -20 5 37 -21 35 20 0.31 -114 0 0 -20 23 18 14 39 25.4 6 246 15 -19 49 17 -20 57 24 -19 38 30 -21 8 16 0.32 -113 0 0 -19 56 2 14 39 24.5 4 246 16 -19 22 0 -20 30 10 -19 11 13 -20 41 2 0.33 -112 0 0 -19 28 38 14 39 23.7 3 245 17 -18 54 35 -20 2 47 -18 43 48 -20 13 39 0.35 -111 0 0 -19 1 5 14 39 23.1 2 245 17 -18 27 2 -19 35 15 -18 16 14 -19 46 7 0.39 -110 0 0 -18 33 25 14 39 22.7 1 245 18 -17 59 20 -19 7 35 -17 48 32 -19 18 27 0.49 -109 0 0 -18 5 37 14 39 22.5 0 244 19 -17 31 32 -18 39 48 .. .. .. -18 50 40 1.27 Uncertainty in time = +/- 4 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4-328-064630 * constellation : Crater * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 11 14 15.4571 DE: -24 25 35.707 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 11 14 15.4571 DE: -24 25 35.708 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (683) Lanzia asteroid class: approx. diameter [km]: 109 approx. diameter ["]: 0.073 distance from Earth [AU]: 2.06500 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#98 date of fit: 2023 Feb 07 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): 0.032", 0.006", 112.501° remarks: * orbital elements for (683)Lanzia : Mean anomaly = 352.6070420677 deg Arg. of pericenter = 280.6476275454 deg Long. of node = 259.6503012133 deg Inclination = 18.5241894157 deg Eccentricity = 0.0584327112 Semimajor axis = 3.1155696934 AU Perihelion dist = 2.9335185094 AU Mag: H = 8.74, G = 0.15 Epoch of elements : MJD 60001.61729167 TDT (2023 Feb 26.6173) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#982023Feb07,10.21,2023,2,26,14.815281,-0.018125,-0.273859,-6.032573,0.396917,-0.000930,0.003199,0.000001,0.000000 150.4292,-24.5530,-39.01,-8.67,False UCAC4-328-064630,11.23762697,-24.4265851,0.00,12.48,0.00,0.0,0,,11.25680360,-24.5529583,1.27,0.00,0,0,0 683,Lanzia,13.35,109.4,2.0650,0,0,-1.883,1.69,,6.8,0 0,352.4964,2023,2,26,280.6476,259.6503,18.5242,0.05843,3.11557,2.93352,8.75,5.0,0.15 1.159,0.0320,0.0057,113,0.0116,Known errors,-1.00,-1,-1,-1 20230226_064630,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org