IOTA/IOTA-ES occultation update for (1578) Kirkwood / UCAC4 366-067063 event on 2024 Jul 07, 10:01 UT Visible from Summary ------- On 2024 Jul 07 UT, the 50.731 km diameter asteroid (1578) Kirkwood will occult a 11.8 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.60 mag to 17.37 mag (the magnitude of the asteroid) for at most 14.050 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: 99 * date and approx. time of event: 2024 Jul 07, 09:31 - 2024 Jul 07, 10:31 * geocentric midpoint of event [JD]: 2460498.91767479 * magnitude of target star: 11.78 * magnitude drop [mag]: 5.60 * estimated maximum duration [s]: 14.050 * Moon: 3 % sunlit, 104° distance * Sun: 122° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 8.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.003", 108°) * approx speed of asteroid's shadow [km/s]: 3.6110 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 366-067063 by 1578 Kirkwood on 2024 Jul 7 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 54 0 0 6 17 10 10 30 47.4 0 107 56 6 31 35 6 2 45 6 36 19 5 58 2 .... 55 0 0 5 58 40 10 30 47.0 1 107 55 6 13 6 5 44 14 6 17 49 5 39 30 0.12 56 0 0 5 39 58 10 30 46.1 2 107 54 5 54 24 5 25 31 5 59 8 5 20 47 0.09 57 0 0 5 21 4 10 30 44.5 3 107 53 5 35 31 5 6 37 5 40 15 5 1 52 0.08 58 0 0 5 1 59 10 30 42.4 4 107 52 5 16 27 4 47 31 5 21 12 4 42 47 0.07 59 0 0 4 42 44 10 30 39.6 5 108 51 4 57 13 4 28 16 5 1 58 4 23 31 0.07 60 0 0 4 23 19 10 30 36.3 6 108 50 4 37 49 4 8 50 4 42 34 4 4 5 0.07 61 0 0 4 3 45 10 30 32.5 7 108 49 4 18 15 3 49 15 4 23 0 3 44 29 0.07 62 0 0 3 44 1 10 30 28.0 8 108 48 3 58 31 3 29 30 4 3 17 3 24 45 0.06 63 0 0 3 24 9 10 30 23.0 10 108 47 3 38 40 3 9 37 3 43 25 3 4 52 0.06 64 0 0 3 4 8 10 30 17.5 11 108 46 3 18 40 2 49 36 3 23 25 2 44 50 0.06 65 0 0 2 44 0 10 30 11.4 12 108 45 2 58 32 2 29 27 3 3 18 2 24 41 0.06 66 0 0 2 23 44 10 30 4.7 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-110 0 0 -17 18 16 9 32 12.1 2 253 -60 -17 3 51 -17 32 42 -16 59 7 -17 37 26 0.13 -109 0 0 -17 0 13 9 32 11.4 1 253 -59 -16 45 47 -17 14 40 -16 41 3 -17 19 24 0.23 Uncertainty in time = +/- 8 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 366-067063 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 00 31.5000 DE: -16 48 44.312 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 00 31.5000 DE: -16 48 44.312 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1578) Kirkwood asteroid class: approx. diameter [km]: 51 approx. diameter ["]: 0.017 distance from Earth [AU]: 4.18600 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.010", 0.003", 107.57° remarks: * orbital elements for (1578)Kirkwood : Mean anomaly = 151.7439338601 deg Arg. of pericenter = 1.8057235187 deg Long. of node = 74.0227700706 deg Inclination = 0.8076826169 deg Eccentricity = 0.2414155599 Semimajor axis = 3.9297042794 AU Perihelion dist = 2.9810125206 AU Mag: H = 10.20, G = 0.15 Epoch of elements : MJD 60498.41767421 TDT (2024 Jul 07.4177) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,14.05,2024,7,7,10.024195,-0.019674,-0.092302,-1.993556,0.423998,0.004723,-0.001389,0.000001,0.000000 149.2482,-16.9106,30.90,22.50,False UCAC4 366-067063,15.00875000,-16.8123090,12.47,11.78,11.41,0.0,0,,15.03177416,-16.9105989,5.59,5.52,0,0,0 1578,Kirkwood,17.37,50.731,4.1860,0,0,-0.291,0.89,,2.8,0 0,151.6911,2024,7,7,1.8057,74.0228,0.8077,0.24142,3.92970,2.98101,10.19,5.0,0.15 1.164,0.0097,0.0026,108,0.0027,Known errors,0.98,0,-1,-1 20240707_067063,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org