IOTA/IOTA-ES occultation update for (146) Lucina / UCAC4 333-128237 event on 2023 Jun 09, 16:02 UT Visible from Australia Summary ------- On 2023 Jun 09 UT, the 137.2 km diameter asteroid (146) Lucina will occult a 12.1 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.63 mag to 11.78 mag (the magnitude of the asteroid) for at most 12.190 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 09, 15:53 - 2023 Jun 09, 16:11 * geocentric midpoint of event [JD]: 2460105.16838484 * magnitude of target star: 12.05 * magnitude drop [mag]: 0.63 * estimated maximum duration [s]: 12.190 * Moon: 63 % sunlit, 65° distance * Sun: 171° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 142 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.006", 105°) * approx speed of asteroid's shadow [km/s]: 11.2549 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 333-128237 by 146 Lucina on 2023 Jun 9 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 21 0 0 -33 24 36 16 11 35.8 0 118 -8 .. .. .. -34 8 8 .. .. .. -34 21 14 .... 22 0 0 -33 51 27 16 11 35.7 1 118 -9 -33 8 13 -34 34 51 -32 55 15 -34 47 55 0.28 23 0 0 -34 17 49 16 11 35.4 2 117 -10 -33 34 42 -35 1 5 -33 21 46 -35 14 6 0.27 24 0 0 -34 43 40 16 11 34.9 3 117 -11 -34 0 41 -35 26 48 -33 47 48 -35 39 47 0.26 25 0 0 -35 9 1 16 11 34.3 4 116 -11 -34 26 10 -35 52 2 -34 13 19 -36 4 58 0.26 26 0 0 -35 33 52 16 11 33.6 5 115 -12 -34 51 9 -36 16 45 -34 38 20 -36 29 39 0.26 27 0 0 -35 58 13 16 11 32.7 6 115 -13 -35 15 37 -36 40 58 -35 2 51 -36 53 50 0.25 28 0 0 -36 22 4 16 11 31.7 7 114 -14 -35 39 36 -37 4 41 -35 26 53 -37 17 31 0.25 29 0 0 -36 45 25 16 11 30.6 8 114 -15 -36 3 5 -37 27 54 -35 50 24 -37 40 41 0.25 30 0 0 -37 8 16 16 11 29.3 8 113 -16 -36 26 3 -37 50 37 -36 13 25 -38 3 22 0.25 31 0 0 -37 30 37 16 11 27.9 9 112 -17 -36 48 32 -38 12 50 -36 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5 33 42 3 43 41 0.31 -144 0 0 5 6 42 15 53 21.4 3 246 6 5 48 49 4 24 27 6 1 26 4 11 44 0.33 -143 0 0 5 34 7 15 53 20.9 2 246 7 6 16 7 4 51 59 6 28 42 4 39 18 0.37 -142 0 0 6 1 4 15 53 20.6 1 246 8 6 42 56 5 19 3 6 55 29 5 6 24 0.51 -141 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 5 45 37 .. .. .. 5 33 1 .... Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 333-128237 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 49 57.9626 DE: -23 26 23.547 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 49 57.9626 DE: -23 26 23.547 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (146) Lucina asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.121 distance from Earth [AU]: 1.55990 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#117 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): 0.029", 0.006", 105.344° remarks: * orbital elements for (146)Lucina : Mean anomaly = 30.4983673627 deg Arg. of pericenter = 145.4169474676 deg Long. of node = 83.9296070738 deg Inclination = 13.0990907167 deg Eccentricity = 0.0661488807 Semimajor axis = 2.7182136610 AU Perihelion dist = 2.5384068699 AU Mag: H = 8.41, G = 0.11 Epoch of elements : MJD 60104.66826389 TDT (2023 Jun 09.6683) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1172023Apr24,12.19,2023,6,9,16.041236,0.094556,-0.236903,-5.899965,-2.354891,-0.000933,0.000019,0.000001,0.000000 129.4673,-23.4473,-60.80,22.95,False UCAC4 333-128237,17.83276740,-23.4398743,0.00,12.05,0.00,0.0,0,,17.85677120,-23.4472563,0.63,0.00,0,0,0 146,Lucina,11.78,137.2,1.5599,0,0,-2.417,-13.28,,7.6,0 0,30.3514,2023,6,9,145.4169,83.9296,13.0991,0.06615,2.71821,2.53841,8.42,5.0,0.15 1.150,0.0290,0.0063,105,0.0182,Known errors,-1.00,-1,-1,-1 20230609_128237,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org