IOTA/IOTA-ES occultation update for (6722) Bunichi / UCAC4 533-049713 event on 2024 Oct 15, 02:40 UT Visible from Summary ------- On 2024 Oct 15 UT, the 15.146 km diameter asteroid (6722) Bunichi will occult a 11.8 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.61 mag to 18.36 mag (the magnitude of the asteroid) for at most 0.460 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: 97 * date and approx. time of event: 2024 Oct 15, 02:37 - 2024 Oct 15, 02:43 * geocentric midpoint of event [JD]: 2460598.61152588 * magnitude of target star: 11.75 * magnitude drop [mag]: 6.61 * estimated maximum duration [s]: 0.460 * Moon: 91 % sunlit, 153° distance * Sun: 61° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.003", 108°) * approx speed of asteroid's shadow [km/s]: 32.7834 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 533-049713 by 6722 Bunichi on 2024 Oct 15 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 - 6 0 0 - 9 9 41 2 37 41.4 1 73 -49 - 9 14 28 - 9 4 55 - 9 18 13 - 9 1 11 .... - 5 0 0 - 8 52 13 2 37 41.5 2 73 -48 - 8 56 59 - 8 47 27 - 9 0 43 - 8 43 43 0.26 - 4 0 0 - 8 35 7 2 37 41.7 3 73 -48 - 8 39 52 - 8 30 21 - 8 43 36 - 8 26 38 0.35 - 3 0 0 - 8 18 24 2 37 41.9 4 73 -47 - 8 23 9 - 8 13 39 - 8 26 53 - 8 9 56 0.39 - 2 0 0 - 8 2 5 2 37 42.2 5 73 -46 - 8 6 50 - 7 57 21 - 8 10 33 - 7 53 38 0.41 - 1 0 0 - 7 46 10 2 37 42.5 6 72 -45 - 7 50 55 - 7 41 27 - 7 54 37 - 7 37 44 0.43 0 0 0 - 7 30 40 2 37 42.9 7 72 -44 - 7 35 23 - 7 25 56 - 7 39 6 - 7 22 14 0.44 1 0 0 - 7 15 33 2 37 43.4 8 72 -43 - 7 20 17 - 7 10 50 - 7 23 59 - 7 7 9 0.45 2 0 0 - 7 0 52 2 37 44.0 9 72 -43 - 7 5 35 - 6 56 9 - 7 9 16 - 6 52 28 0.45 3 0 0 - 6 46 35 2 37 44.6 10 72 -42 - 6 51 17 - 6 41 53 - 6 54 59 - 6 38 12 0.46 4 0 0 - 6 32 44 2 37 45.3 11 72 -41 - 6 37 25 - 6 28 2 - 6 41 7 - 6 24 21 0.46 5 0 0 - 6 19 17 2 37 46.1 12 72 -40 - 6 23 59 - 6 14 36 - 6 27 40 - 6 10 56 0.46 6 0 0 - 6 6 17 2 37 46.9 13 72 -39 - 6 10 58 - 6 1 36 - 6 14 38 - 5 57 56 0.47 7 0 0 - 5 53 42 2 37 47.8 14 71 -38 - 5 58 23 - 5 49 2 - 6 2 3 - 5 45 22 0.47 8 0 0 - 5 41 33 2 37 48.7 15 71 -37 - 5 46 14 - 5 36 53 - 5 49 54 - 5 33 14 0.47 9 0 0 - 5 29 51 2 37 49.8 16 71 -36 - 5 34 31 - 5 25 11 - 5 38 10 - 5 21 32 0.47 10 0 0 - 5 18 35 2 37 50.8 17 71 -35 - 5 23 14 - 5 13 55 - 5 26 53 - 5 10 16 0.47 11 0 0 - 5 7 45 2 37 52.0 18 71 -34 - 5 12 24 - 5 3 6 - 5 16 3 - 4 59 27 0.47 12 0 0 - 4 57 22 2 37 53.2 19 71 -33 - 5 2 0 - 4 52 43 - 5 5 39 - 4 49 5 0.48 13 0 0 - 4 47 25 2 37 54.5 20 71 -33 - 4 52 4 - 4 42 47 - 4 55 42 - 4 39 9 0.48 14 0 0 - 4 37 56 2 37 55.8 21 70 -32 - 4 42 34 - 4 33 18 - 4 46 12 - 4 29 40 0.48 15 0 0 - 4 28 54 2 37 57.2 22 70 -31 - 4 33 31 - 4 24 16 - 4 37 9 - 4 20 38 0.48 16 0 0 - 4 20 18 2 37 58.7 23 70 -30 - 4 24 56 - 4 15 41 - 4 28 34 - 4 12 4 0.48 17 0 0 - 4 12 11 2 38 0.2 24 70 -29 - 4 16 48 - 4 7 33 - 4 20 25 - 4 3 56 0.48 18 0 0 - 4 4 30 2 38 1.8 25 70 -28 - 4 9 7 - 3 59 53 - 4 12 45 - 3 56 16 0.48 19 0 0 - 3 57 17 2 38 3.4 26 70 -27 - 4 1 54 - 3 52 41 - 4 5 31 - 3 49 4 0.48 20 0 0 - 3 50 32 2 38 5.1 27 69 -26 - 3 55 9 - 3 45 56 - 3 58 46 - 3 42 19 0.48 21 0 0 - 3 44 14 2 38 6.9 28 69 -25 - 3 48 51 - 3 39 38 - 3 52 28 - 3 36 2 0.48 22 0 0 - 3 38 25 2 38 8.7 29 69 -24 - 3 43 1 - 3 33 48 - 3 46 37 - 3 30 12 0.48 23 0 0 - 3 33 3 2 38 10.6 30 69 -23 - 3 37 39 - 3 28 27 - 3 41 15 - 3 24 51 0.49 24 0 0 - 3 28 9 2 38 12.5 31 69 -22 - 3 32 45 - 3 23 33 - 3 36 21 - 3 19 57 0.49 25 0 0 - 3 23 43 2 38 14.5 32 68 -21 - 3 28 18 - 3 19 7 - 3 31 55 - 3 15 31 0.49 26 0 0 - 3 19 45 2 38 16.5 33 68 -20 - 3 24 20 - 3 15 9 - 3 27 56 - 3 11 33 0.49 27 0 0 - 3 16 15 2 38 18.6 34 68 -19 - 3 20 50 - 3 11 39 - 3 24 26 - 3 8 4 0.49 28 0 0 - 3 13 13 2 38 20.7 35 67 -18 - 3 17 48 - 3 8 38 - 3 21 24 - 3 5 2 0.49 29 0 0 - 3 10 39 2 38 22.9 35 67 -17 - 3 15 15 - 3 6 4 - 3 18 51 - 3 2 29 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-36 59 50 -36 41 54 0.50 143 0 0 -37 12 52 2 43 26.9 10 299 61 -37 17 53 -37 7 51 -37 21 50 -37 3 55 0.50 144 0 0 -37 34 36 2 43 27.4 9 299 60 -37 39 36 -37 29 35 -37 43 32 -37 25 40 0.50 145 0 0 -37 56 2 2 43 27.9 8 298 60 -38 1 2 -37 51 2 -38 4 58 -37 47 7 0.50 146 0 0 -38 17 11 2 43 28.3 7 297 59 -38 22 11 -38 12 11 -38 26 6 -38 8 16 0.50 147 0 0 -38 38 2 2 43 28.6 6 297 58 -38 43 1 -38 33 3 -38 46 56 -38 29 8 0.50 148 0 0 -38 58 35 2 43 29.0 5 296 58 -39 3 34 -38 53 36 -39 7 28 -38 49 42 0.50 149 0 0 -39 18 50 2 43 29.2 4 295 57 -39 23 48 -39 13 52 -39 27 42 -39 9 58 0.50 150 0 0 -39 38 46 2 43 29.5 4 295 56 -39 43 44 -39 33 49 -39 47 38 -39 29 55 0.51 151 0 0 -39 58 24 2 43 29.6 3 294 56 -40 3 22 -39 53 27 -40 7 15 -39 49 34 0.51 152 0 0 -40 17 43 2 43 29.8 2 294 55 -40 22 40 -40 12 47 -40 26 33 -40 8 54 0.52 153 0 0 -40 36 44 2 43 29.8 1 293 55 -40 41 40 -40 31 47 -40 45 32 -40 27 55 0.54 154 0 0 -40 55 25 2 43 29.9 0 292 54 -41 0 21 -40 50 29 -41 4 13 -40 46 38 0.68 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 533-049713 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 35 32.3175 DE: +16 34 42.575 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 35 32.3176 DE: +16 34 42.575 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.300) * V mag [mag]: 11.8 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6722) Bunichi asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.94940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#44 date of fit: 2023 Feb 10 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): 0.021", 0.003", 107.926° remarks: * orbital elements for (6722)Bunichi : Mean anomaly = 2.2312261224 deg Arg. of pericenter = 54.9647159835 deg Long. of node = 63.1108781761 deg Inclination = 2.8156199660 deg Eccentricity = 0.1777104078 Semimajor axis = 3.1830552892 AU Perihelion dist = 2.6173932356 AU Mag: H = 12.94, G = 0.15 Epoch of elements : MJD 60598.11152567 TDT (2024 Oct 15.1115) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#442023Feb10,0.46,2024,10,15,2.676621,-0.126889,-0.424810,17.727688,-5.303076,-0.004694,0.001710,-0.000001,0.000000 79.9459,16.4693,136.29,-8.66,False UCAC4 533-049713,9.59231038,16.5784933,12.02,11.75,11.60,0.0,0,,9.61489897,16.4692592,6.61,6.31,0,0,0 6722,Bunichi,18.36,15.146,2.9494,0,0,3.675,-15.81,,1.6,0 0,2.2119,2024,10,15,54.9647,63.1109,2.8156,0.17771,3.18306,2.61739,12.94,5.0,0.15 1.392,0.0207,0.0027,108,0.0028,Known errors,2.25,0,-1,-1 20241015_049713,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org