IOTA/IOTA-ES occultation update for (302) Clarissa / UCAC4 357-196206 event on 2024 Oct 24, 23:37 UT Visible from Summary ------- On 2024 Oct 24 UT, the 37.039 km diameter asteroid (302) Clarissa will occult a 11.3 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.28 mag to 15.55 mag (the magnitude of the asteroid) for at most 3.290 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: 2024 Oct 24, 23:28 - 2024 Oct 24, 23:47 * geocentric midpoint of event [JD]: 2460608.48447779 * magnitude of target star: 11.29 * magnitude drop [mag]: 4.28 * estimated maximum duration [s]: 3.290 * Moon: 43 % sunlit, 176° distance * Sun: 102° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 70°) * approx speed of asteroid's shadow [km/s]: 11.2449 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 357-196206 by 302 Clarissa on 2024 Oct 24 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 -171 0 0 -33 32 45 23 28 19.4 0 112 68 -33 43 45 -33 21 46 -33 46 40 -33 18 50 .... -170 0 0 -33 53 0 23 28 19.5 1 112 68 -34 3 58 -33 42 3 -34 6 53 -33 39 8 0.21 -169 0 0 -34 12 47 23 28 19.8 2 111 67 -34 23 43 -34 1 51 -34 26 37 -33 58 57 0.20 -168 0 0 -34 32 4 23 28 20.2 3 110 67 -34 42 58 -34 21 10 -34 45 52 -34 18 17 0.19 -167 0 0 -34 50 53 23 28 20.8 4 110 66 -35 1 45 -34 40 1 -35 4 39 -34 37 7 0.19 -166 0 0 -35 9 12 23 28 21.5 5 109 65 -35 20 3 -34 58 22 -35 22 56 -34 55 29 0.18 -165 0 0 -35 27 3 23 28 22.3 6 109 65 -35 37 52 -35 16 15 -35 40 44 -35 13 23 0.18 -164 0 0 -35 44 25 23 28 23.3 7 108 64 -35 55 12 -35 33 39 -35 58 4 -35 30 47 0.18 -163 0 0 -36 1 19 23 28 24.3 7 108 63 -36 12 4 -35 50 34 -36 14 55 -35 47 42 0.18 -162 0 0 -36 17 43 23 28 25.5 8 107 63 -36 28 26 -36 7 0 -36 31 18 -36 4 9 0.18 -161 0 0 -36 33 39 23 28 26.8 9 106 62 -36 44 21 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35 .. .. .. 4.34 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 357-196206 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 07 06.2875 DE: -18 40 42.707 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 07 06.2872 DE: -18 40 42.708 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.3 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (302) Clarissa asteroid class: approx. diameter [km]: 37 approx. diameter ["]: 0.026 distance from Earth [AU]: 1.93650 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#69 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): 0.015", 0.003", 69.705° remarks: * orbital elements for (302)Clarissa : Mean anomaly = 287.5291399150 deg Arg. of pericenter = 55.3288662595 deg Long. of node = 7.7166538643 deg Inclination = 3.4131679964 deg Eccentricity = 0.1105158656 Semimajor axis = 2.4054513909 AU Perihelion dist = 2.1396108482 AU Mag: H = 11.13, G = 0.15 Epoch of elements : MJD 60607.98447779 TDT (2024 Oct 24.9845) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#692023Apr24,3.29,2024,10,24,23.627467,0.071012,-0.144539,5.704498,2.782553,0.005257,0.001645,0.000000,0.000000 -71.1446,-18.5794,-178.39,-12.19,False UCAC4 357-196206,21.11841321,-18.6785296,11.58,11.29,11.13,0.0,0,,21.14180243,-18.5794078,4.28,3.99,0,0,0 302,Clarissa,15.55,37.039,1.9365,0,0,1.823,12.64,,2.6,0 0,287.2691,2024,10,24,55.3289,7.7167,3.4132,0.11052,2.40545,2.13961,11.12,5.0,0.15 1.133,0.0153,0.0032,70,0.0035,Known errors,0.79,0,-1,-1 20241024_196206,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org