IOTA/IOTA-ES occultation update for (1078) Mentha / UCAC4 318-230227 event on 2024 Oct 26, 09:26 UT Visible from Summary ------- On 2024 Oct 26 UT, the 11.993 km diameter asteroid (1078) Mentha will occult a 11.5 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.27 mag to 16.72 mag (the magnitude of the asteroid) for at most 0.520 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: 98 * date and approx. time of event: 2024 Oct 26, 09:21 - 2024 Oct 26, 09:31 * geocentric midpoint of event [JD]: 2460609.89329992 * magnitude of target star: 11.46 * magnitude drop [mag]: 5.27 * estimated maximum duration [s]: 0.520 * Moon: 31 % sunlit, 145° distance * Sun: 77° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 83°) * approx speed of asteroid's shadow [km/s]: 22.8625 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 318-230227 by 1078 Mentha on 2024 Oct 26 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 27 0 0 - 2 51 38 9 21 44.1 1 116 77 - 2 55 17 - 2 47 59 - 2 57 51 - 2 45 25 .... 28 0 0 - 3 21 19 9 21 44.2 2 116 78 - 3 24 58 - 3 17 41 - 3 27 32 - 3 15 7 0.02 29 0 0 - 3 50 46 9 21 44.4 3 116 79 - 3 54 25 - 3 47 8 - 3 56 58 - 3 44 35 -0.03 30 0 0 - 4 19 58 9 21 44.7 4 116 80 - 4 23 36 - 4 16 20 - 4 26 9 - 4 13 47 -0.05 31 0 0 - 4 48 53 9 21 45.1 5 116 81 - 4 52 31 - 4 45 16 - 4 55 4 - 4 42 43 -0.06 32 0 0 - 5 17 32 9 21 45.7 6 116 82 - 5 21 9 - 5 13 55 - 5 23 42 - 5 11 22 -0.07 33 0 0 - 5 45 53 9 21 46.3 7 116 83 - 5 49 30 - 5 42 16 - 5 52 2 - 5 39 44 -0.08 34 0 0 - 6 13 56 9 21 47.0 8 116 83 - 6 17 33 - 6 10 20 - 6 20 5 - 6 7 48 -0.08 35 0 0 - 6 41 41 9 21 47.9 9 116 84 - 6 45 17 - 6 38 5 - 6 47 48 - 6 35 33 -0.08 36 0 0 - 7 9 6 9 21 48.8 11 116 84 - 7 12 41 - 7 5 30 - 7 15 13 - 7 2 59 -0.09 37 0 0 - 7 36 11 9 21 49.9 12 115 85 - 7 39 46 - 7 32 36 - 7 42 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0.37 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 318-230227 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 32 02.7890 DE: -26 24 40.197 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 32 02.7890 DE: -26 24 40.197 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.5 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1078) Mentha asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.60730 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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): 0.009", 0.002", 83.402° remarks: * orbital elements for (1078)Mentha : Mean anomaly = 173.2716876224 deg Arg. of pericenter = 44.3450707706 deg Long. of node = 93.7559885874 deg Inclination = 7.3651896157 deg Eccentricity = 0.1381204435 Semimajor axis = 2.2695658711 AU Perihelion dist = 1.9560924266 AU Mag: H = 11.51, G = 0.15 Epoch of elements : MJD 60609.39329958 TDT (2024 Oct 26.3933) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr24,0.52,2024,10,26,9.439198,-0.018900,0.111846,12.731870,2.102205,0.005575,0.000793,0.000000,0.000000 116.5548,-26.3599,34.39,-12.67,False UCAC4 318-230227,19.53410809,-26.4111657,12.14,11.46,11.09,0.0,0,,19.55939729,-26.3598744,5.26,5.18,0,0,0 1078,Mentha,16.72,11.993,2.6073,0,0,3.195,7.09,,0.8,0 0,173.1583,2024,10,26,44.3451,93.7560,7.3652,0.13812,2.26957,1.95609,11.51,5.0,0.15 1.351,0.0087,0.0022,83,0.0022,Known errors,0.76,0,-1,-1 20241026_230227,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org