IOTA/IOTA-ES occultation update for (146) Lucina / TYC 6840-00514-1 event on 2023 Sep 27, 19:38 UT Visible from S Africa Summary ------- On 2023 Sep 27 UT, the 137.2 km diameter asteroid (146) Lucina will occult a 10.9 mag star in the constellation Sagittarius for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.82 mag to 13.60 mag (the magnitude of the asteroid) for at most 6.500 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 Sep 27, 19:33 - 2023 Sep 27, 19:43 * geocentric midpoint of event [JD]: 2460215.31845187 * magnitude of target star: 10.86 * magnitude drop [mag]: 2.82 * estimated maximum duration [s]: 6.500 * Moon: 96 % sunlit, 75° distance * Sun: 83° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 138 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.000", 105°) * approx speed of asteroid's shadow [km/s]: 21.1118 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6840-00514-1 by 146 Lucina on 2023 Sep 27 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 -122 0 0 .. .. .... .. .. .. .. .. .. - 0 8 30 .. .. .. - 0 10 11 .. .. .. .... -121 0 0 0 0 16 19 33 33.1 1 119 84 - 0 42 42 0 43 11 - 0 44 23 0 44 52 .... -120 0 0 - 0 34 1 19 33 33.2 2 119 85 - 1 17 2 0 8 56 - 1 18 43 0 10 37 0.14 -119 0 0 - 1 8 26 19 33 33.5 3 119 87 - 1 51 29 - 0 25 26 - 1 53 10 - 0 23 45 0.12 -118 0 0 - 1 42 57 19 33 33.9 4 119 88 - 2 26 2 - 0 59 55 - 2 27 43 - 0 58 14 0.11 -117 0 0 - 2 17 33 19 33 34.5 6 119 89 - 3 0 40 - 1 34 30 - 3 2 21 - 1 32 49 0.11 -116 0 0 - 2 52 14 19 33 35.1 7 119 89 - 3 35 22 - 2 9 9 - 3 37 3 - 2 7 28 0.10 -115 0 0 - 3 26 58 19 33 35.9 8 119 88 - 4 10 7 - 2 43 52 - 4 11 48 - 2 42 11 0.10 -114 0 0 - 4 1 44 19 33 36.8 9 119 87 - 4 44 54 - 3 18 37 - 4 46 35 - 3 16 56 0.10 -113 0 0 - 4 36 31 19 33 37.9 10 119 86 - 5 19 41 - 3 53 23 - 5 21 23 - 3 51 42 0.10 -112 0 0 - 5 11 17 19 33 39.0 11 119 85 - 5 54 28 - 4 28 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Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: TYC 6840-00514-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 48 39.4177 DE: -29 25 53.362 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 48 39.4176 DE: -29 25 53.361 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (146) Lucina asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.074 distance from Earth [AU]: 2.54090 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#119 date of fit: 2023 Aug 22 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): 0.008", 0.000", 105.389° remarks: * orbital elements for (146)Lucina : Mean anomaly = 54.7977731876 deg Arg. of pericenter = 145.3464576970 deg Long. of node = 83.9302952062 deg Inclination = 13.0997177009 deg Eccentricity = 0.0660462061 Semimajor axis = 2.7178391250 AU Perihelion dist = 2.5383361619 AU Mag: H = 8.55, G = 0.11 Epoch of elements : MJD 60214.81847222 TDT (2023 Sep 27.8185) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1192023Aug22,6.50,2023,9,27,19.642845,-0.006573,-0.075296,11.872179,-1.021815,0.005586,-0.000163,0.000000,0.000000 -33.4384,-29.4406,-116.90,-1.77,False TYC 6840-00514-1,17.81094938,-29.4314893,0.00,10.86,0.00,0.0,0,,17.83597029,-29.4405941,2.82,0.00,0,0,0 146,Lucina,13.60,137.200,2.5409,0,0,3.146,-3.54,,7.6,0 0,54.6177,2023,9,27,145.3465,83.9303,13.0997,0.06605,2.71784,2.53834,8.41,5.0,0.15 1.020,0.0077,0.0004,105,0.0077,Known errors,-1.00,0,-1,-1 20230927_0514-1,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org