IOTA/IOTA-ES occultation update for (146) Lucina / TYC 6236-00371-1 event on 2023 Feb 16, 08:18 UT Visible from South America Summary ------- On 2023 Feb 16 UT, the 137.2 km diameter asteroid (146) Lucina will occult a 12.0 mag star in the constellation Ophiuchus for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.86 mag to 13.65 mag (the magnitude of the asteroid) for at most 4.820 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 Feb 16, 08:14 - 2023 Feb 16, 08:21 * geocentric midpoint of event [JD]: 2459991.84587641 * magnitude of target star: 12.01 * magnitude drop [mag]: 1.86 * estimated maximum duration [s]: 4.820 * Moon: 22 % sunlit, 17° distance * Sun: 69° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 147 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.003", 110°) * approx speed of asteroid's shadow [km/s]: 28.4581 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6236-00371-1 by 146 Lucina on 2023 Feb 16 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 -106 0 0 .. .. .... .. .. .. .. .. .. -13 1 32 .. .. .. -13 6 50 .. .. .. .... -105 0 0 -12 38 15 8 14 34.9 1 107 -61 -13 20 23 -11 56 19 -13 25 41 -11 51 5 .... -104 0 0 -12 57 14 8 14 35.1 2 107 -60 -13 39 25 -12 15 16 -13 44 43 -12 10 1 0.35 -103 0 0 -13 16 24 8 14 35.2 3 107 -59 -13 58 38 -12 34 24 -14 3 56 -12 29 8 0.37 -102 0 0 -13 35 45 8 14 35.5 4 107 -58 -14 18 1 -12 53 42 -14 23 20 -12 48 26 0.38 -101 0 0 -13 55 16 8 14 35.9 5 106 -58 -14 37 35 -13 13 10 -14 42 54 -13 7 55 0.38 -100 0 0 -14 14 57 8 14 36.3 6 106 -57 -14 57 18 -13 32 48 -15 2 37 -13 27 32 0.38 - 99 0 0 -14 34 46 8 14 36.8 7 106 -56 -15 17 10 -13 52 36 -15 22 30 -13 47 20 0.38 - 98 0 0 -14 54 45 8 14 37.3 8 106 -55 -15 37 11 -14 12 32 -15 42 31 -14 7 16 0.39 - 97 0 0 -15 14 52 8 14 38.0 9 105 -54 -15 57 20 -14 32 37 -16 2 40 -14 27 20 0.39 - 96 0 0 -15 35 6 8 14 38.7 10 105 -53 -16 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Uncertainty in time = +/- 1 secs Prediction of 2022 Dec 30.1 Data for the target star ------------------------ * name: TYC 6236-00371-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 09 11.3078 DE: -17 08 53.479 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 09 11.3079 DE: -17 08 53.479 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (146) Lucina asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.070 distance from Earth [AU]: 2.71320 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#116 date of fit: 2022 Nov 25 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): 0.017", 0.003", 110.053° remarks: * orbital elements for (146)Lucina : Mean anomaly = 5.5367300355 deg Arg. of pericenter = 145.4593608400 deg Long. of node = 83.9303240669 deg Inclination = 13.0984988029 deg Eccentricity = 0.0662223610 Semimajor axis = 2.7184559596 AU Perihelion dist = 2.5384333875 AU Mag: H = 8.42, G = 0.11 Epoch of elements : MJD 59991.34590278 TDT (2023 Feb 16.3459) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1162022Nov25,4.82,2023,2,16,8.301034,-0.053218,-0.359086,15.888462,-2.358436,-0.005404,0.000679,-0.000001,0.000000 -12.9580,-17.1783,59.00,-12.38,False TYC 6236-00371-1,17.15314102,-17.1481885,0.00,12.01,0.00,0.0,0,,17.17514909,-17.1782713,1.86,0.00,0,0,0 146,Lucina,13.65,137.2,2.7132,0,0,3.594,-7.64,,7.6,0 0,5.4607,2023,2,16,145.4594,83.9303,13.0985,0.06622,2.71846,2.53843,8.42,5.0,0.15 1.063,0.0170,0.0028,110,0.0044,Known errors,-1.00,-1,-1,-1 20230216_0371-1,59943.05 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 30, 01:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org