IOTA/IOTA-ES occultation update for (33729) 1999 NJ21 / UCAC4 309-145618 event on 2024 Oct 14, 00:13 UT Visible from Summary ------- On 2024 Oct 14 UT, the 12.6572407226762 km diameter asteroid (33729) 1999 NJ21 will occult a 11.1 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 6.98 mag to 18.11 mag (the magnitude of the asteroid) for at most 0.430 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: 94 * date and approx. time of event: 2024 Oct 14, 00:10 - 2024 Oct 14, 00:16 * geocentric midpoint of event [JD]: 2460597.50950633 * magnitude of target star: 11.13 * magnitude drop [mag]: 6.98 * estimated maximum duration [s]: 0.430 * Moon: 83 % sunlit, 61° distance * Sun: 69° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 104°) * approx speed of asteroid's shadow [km/s]: 30.1519 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 309-145618 by 33729 1999 NJ21 on 2024 Oct 14 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 142 0 0 -23 28 47 0 10 40.1 1 121 56 -23 33 33 -23 24 1 -23 37 51 -23 19 44 .... 143 0 0 -24 2 16 0 10 40.2 2 120 57 -24 7 2 -23 57 30 -24 11 21 -23 53 12 0.53 144 0 0 -24 35 56 0 10 40.4 3 120 57 -24 40 43 -24 31 9 -24 45 2 -24 26 50 0.56 145 0 0 -25 9 45 0 10 40.7 4 119 58 -25 14 33 -25 4 57 -25 18 53 -25 0 38 0.58 146 0 0 -25 43 43 0 10 41.1 5 119 58 -25 48 31 -25 38 54 -25 52 52 -25 34 34 0.58 147 0 0 -26 17 48 0 10 41.5 6 119 59 -26 22 37 -26 12 59 -26 26 58 -26 8 38 0.59 148 0 0 -26 51 59 0 10 42.0 7 118 59 -26 56 49 -26 47 9 -27 1 11 -26 42 48 0.59 149 0 0 -27 26 15 0 10 42.6 8 118 60 -27 31 6 -27 21 25 -27 35 28 -27 17 3 0.59 150 0 0 -28 0 35 0 10 43.3 9 117 60 -28 5 26 -27 55 45 -28 9 49 -27 51 22 0.60 151 0 0 -28 34 58 0 10 44.1 10 117 60 -28 39 50 -28 30 7 -28 44 13 -28 25 44 0.60 152 0 0 -29 9 23 0 10 44.9 11 116 61 -29 14 15 -29 4 31 -29 18 38 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26 255 -31 -45 31 34 -45 21 59 -45 35 54 -45 17 40 0.62 - 35 0 0 -45 0 5 0 16 19.0 25 254 -31 -45 4 54 -44 55 17 -45 9 14 -44 50 58 0.62 - 34 0 0 -44 32 59 0 16 20.5 24 253 -32 -44 37 48 -44 28 11 -44 42 9 -44 23 50 0.62 - 33 0 0 -44 5 28 0 16 22.0 23 253 -33 -44 10 18 -44 0 39 -44 14 39 -43 56 18 0.63 - 32 0 0 -43 37 33 0 16 23.4 22 252 -34 -43 42 23 -43 32 43 -43 46 45 -43 28 21 0.63 - 31 0 0 -43 9 13 0 16 24.9 22 251 -34 -43 14 4 -43 4 22 -43 18 26 -43 0 0 0.63 - 30 0 0 -42 40 30 0 16 26.2 21 250 -35 -42 45 21 -42 35 39 -42 49 44 -42 31 16 0.63 - 29 0 0 -42 11 23 0 16 27.6 20 250 -36 -42 16 15 -42 6 32 -42 20 39 -42 2 9 0.63 - 28 0 0 -41 41 55 0 16 28.9 19 249 -37 -41 46 47 -41 37 3 -41 51 11 -41 32 39 0.63 - 27 0 0 -41 12 4 0 16 30.1 18 248 -38 -41 16 56 -41 7 11 -41 21 21 -41 2 48 0.63 - 26 0 0 -40 41 52 0 16 31.3 17 247 -38 -40 46 45 -40 36 59 -40 51 10 -40 32 35 0.63 - 25 0 0 -40 11 19 0 16 32.5 16 247 -39 -40 16 12 -40 6 26 -40 20 37 -40 2 1 0.64 - 24 0 0 -39 40 26 0 16 33.6 15 246 -40 -39 45 20 -39 35 33 -39 49 45 -39 31 8 0.64 - 23 0 0 -39 9 14 0 16 34.6 15 245 -41 -39 14 8 -39 4 21 -39 18 34 -38 59 56 0.64 - 22 0 0 -38 37 44 0 16 35.6 14 245 -41 -38 42 38 -38 32 50 -38 47 4 -38 28 25 0.64 - 21 0 0 -38 5 56 0 16 36.5 13 244 -42 -38 10 50 -38 1 2 -38 15 16 -37 56 37 0.65 - 20 0 0 -37 33 51 0 16 37.4 12 243 -43 -37 38 46 -37 28 57 -37 43 12 -37 24 31 0.65 - 19 0 0 -37 1 30 0 16 38.2 11 243 -44 -37 6 25 -36 56 36 -37 10 51 -36 52 11 0.65 - 18 0 0 -36 28 55 0 16 39.0 10 242 -44 -36 33 50 -36 24 0 -36 38 16 -36 19 35 0.66 - 17 0 0 -35 56 5 0 16 39.7 9 241 -45 -36 1 0 -35 51 11 -36 5 26 -35 46 45 0.67 - 16 0 0 -35 23 2 0 16 40.3 8 241 -46 -35 27 57 -35 18 8 -35 32 23 -35 13 43 0.67 - 15 0 0 -34 49 48 0 16 40.8 7 240 -46 -34 54 42 -34 44 53 -34 59 9 -34 40 28 0.68 - 14 0 0 -34 16 22 0 16 41.3 6 240 -47 -34 21 17 -34 11 28 -34 25 43 -34 7 3 0.70 - 13 0 0 -33 42 46 0 16 41.7 5 239 -48 -33 47 41 -33 37 52 -33 52 7 -33 33 27 0.71 - 12 0 0 -33 9 2 0 16 42.1 4 239 -49 -33 13 56 -33 4 8 -33 18 22 -32 59 43 0.74 - 11 0 0 -32 35 10 0 16 42.3 3 238 -49 -32 40 4 -32 30 16 -32 44 29 -32 25 51 0.79 - 10 0 0 -32 1 11 0 16 42.5 2 238 -50 -32 6 5 -31 56 18 -32 10 30 -31 51 53 0.90 - 9 0 0 -31 27 7 0 16 42.6 1 237 -50 -31 32 0 -31 22 14 -31 36 25 -31 17 49 1.26 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 309-145618 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 59 42.9133 DE: -28 12 40.207 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 59 42.9132 DE: -28 12 40.207 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.1 * B mag [mag]: 12.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (33729) 1999 NJ21 asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.49230 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 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): 0.016", 0.002", 103.776° remarks: * orbital elements for (33729)1999 NJ21 : Mean anomaly = 36.7847284747 deg Arg. of pericenter = 155.8842494637 deg Long. of node = 90.1858555497 deg Inclination = 12.6659178385 deg Eccentricity = 0.1418119929 Semimajor axis = 2.6062243319 AU Perihelion dist = 2.2366304655 AU Mag: H = 13.19, G = 0.15 Epoch of elements : MJD 60597.00950630 TDT (2024 Oct 14.0095) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr25,0.43,2024,10,14,0.228152,-0.041747,-0.512418,16.963641,-1.366503,0.005183,-0.000154,-0.000001,0.000000 -116.1472,-28.2140,173.08,-8.25,False UCAC4 309-145618,17.99525372,-28.2111688,11.98,11.13,10.67,0.1,0,,18.02114518,-28.2139693,6.98,6.99,0,0,0 33729,1999 NJ21,18.11,12.838,2.4923,0,0,4.529,-4.82,,0.6,0 0,36.5482,2024,10,13,155.8842,90.1859,12.6659,0.14181,2.60622,2.23663,13.18,5.0,0.15 1.451,0.0163,0.0019,104,0.0032,Known errors,0.55,0,-1,-1 20241014_145618,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org