IOTA/IOTA-ES occultation update for (39) Laetitia / UCAC4 370-100576 event on 2023 Oct 17, 09:45 UT Visible from Australia Summary ------- On 2023 Oct 17 UT, the 158 km diameter asteroid (39) Laetitia will occult a 11.7 mag star in the constellation Serpens 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 0.77 mag to 11.77 mag (the magnitude of the asteroid) for at most 5.050 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 17, 09:41 - 2023 Oct 17, 09:48 * geocentric midpoint of event [JD]: 2460234.90641417 * magnitude of target star: 11.74 * magnitude drop [mag]: 0.77 * estimated maximum duration [s]: 5.050 * Moon: 8 % sunlit, 32° distance * Sun: 63° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 159 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 96°) * approx speed of asteroid's shadow [km/s]: 31.2874 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 370-100576 by 39 Laetitia on 2023 Oct 17 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 7 0 0 5 8 18 9 41 51.1 1 106 62 4 23 28 5 53 5 4 20 52 5 55 40 .... 8 0 0 4 50 41 9 41 51.2 2 106 63 4 5 48 5 35 30 4 3 12 5 38 6 0.12 9 0 0 4 32 51 9 41 51.4 3 106 64 3 47 56 5 17 43 3 45 20 5 20 19 0.11 10 0 0 4 14 50 9 41 51.6 4 106 65 3 29 52 4 59 44 3 27 16 5 2 20 0.10 11 0 0 3 56 36 9 41 51.9 5 106 66 3 11 37 4 41 33 3 9 0 4 44 9 0.10 12 0 0 3 38 12 9 41 52.2 6 107 67 2 53 10 4 23 10 2 50 33 4 25 47 0.10 13 0 0 3 19 36 9 41 52.6 7 107 68 2 34 32 4 4 37 2 31 55 4 7 14 0.10 14 0 0 3 0 50 9 41 53.1 8 107 69 2 15 43 3 45 53 2 13 6 3 48 30 0.09 15 0 0 2 41 53 9 41 53.7 9 107 70 1 56 45 3 26 58 1 54 7 3 29 35 0.09 16 0 0 2 22 47 9 41 54.3 10 107 71 1 37 36 3 7 54 1 34 59 3 10 31 0.09 17 0 0 2 3 31 9 41 55.0 11 107 72 1 18 18 2 48 40 1 15 41 2 51 17 0.09 18 0 0 1 44 6 9 41 55.7 12 107 73 0 58 51 2 29 17 0 56 14 2 31 54 0.09 19 0 0 1 24 32 9 41 56.6 13 107 74 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9 48 36.2 6 255 -52 -16 53 12 -15 23 58 -16 55 47 -15 21 23 0.11 -178 0 0 -15 52 24 9 48 36.5 5 255 -53 -16 37 5 -15 7 46 -16 39 40 -15 5 11 0.11 -177 0 0 -15 36 1 9 48 36.8 4 255 -54 -16 20 44 -14 51 21 -16 23 20 -14 48 45 0.12 -176 0 0 -15 19 25 9 48 37.1 3 254 -55 -16 4 11 -14 34 42 -16 6 46 -14 32 6 0.13 -175 0 0 -15 2 35 9 48 37.3 2 254 -56 -15 47 24 -14 17 50 -15 50 0 -14 15 15 0.15 -174 0 0 -14 45 33 9 48 37.4 1 254 -57 -15 30 24 -14 0 46 -15 33 0 -13 58 10 0.20 -173 0 0 -14 28 19 9 48 37.4 0 254 -58 -15 13 12 -13 43 29 -15 15 48 -13 40 53 0.57 Uncertainty in time = +/- 1 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4 370-100576 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 42 16.0696 DE: -16 01 50.796 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 42 16.0696 DE: -16 01 50.796 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (39) Laetitia asteroid class: approx. diameter [km]: 158 approx. diameter ["]: 0.073 distance from Earth [AU]: 3.00370 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#126 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): 0.013", 0.002", 96.085° remarks: * orbital elements for (39)Laetitia : Mean anomaly = 290.3540584585 deg Arg. of pericenter = 209.8385899853 deg Long. of node = 156.9297414472 deg Inclination = 10.3706445747 deg Eccentricity = 0.1119743994 Semimajor axis = 2.7686279252 AU Perihelion dist = 2.4586124760 AU Mag: H = 5.97, G = 0.15 Epoch of elements : MJD 60234.40638889 TDT (2023 Oct 17.4064) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1262023Oct09,5.05,2023,10,17,9.753940,-0.015046,-0.080281,17.380531,-3.126560,0.005120,0.000201,-0.000001,0.000000 93.9535,-16.0422,30.05,-9.23,False UCAC4 370-100576,17.70446382,-16.0307767,0.00,11.74,0.00,0.0,4,,17.72696185,-16.0422242,0.77,0.00,0,0,0 39,Laetitia,11.77,158.000,3.0037,0,0,3.530,-9.15,,8.2,0 0,290.2671,2023,10,17,209.8386,156.9297,10.3706,0.11197,2.76863,2.45861,6.26,5.0,0.15 1.029,0.0133,0.0019,96,0.0135,Known errors,-1.00,0,-1,-1 20231017_100576,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org