IOTA/IOTA-ES occultation update for (33729) 1999 NJ21 / TYC 6856-01788-1 event on 2024 Oct 24, 11:29 UT Visible from Summary ------- On 2024 Oct 24 UT, the 12.6729870362854 km diameter asteroid (33729) 1999 NJ21 will occult a 9.6 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 8.63 mag to 18.19 mag (the magnitude of the asteroid) for at most 0.390 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 24, 11:26 - 2024 Oct 24, 11:32 * geocentric midpoint of event [JD]: 2460607.97885117 * magnitude of target star: 9.56 * magnitude drop [mag]: 8.63 * estimated maximum duration [s]: 0.390 * Moon: 49 % sunlit, 152° distance * Sun: 63° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 102°) * approx speed of asteroid's shadow [km/s]: 33.1148 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6856-01788-1 by 33729 1999 NJ21 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 - 19 0 0 - 0 47 57 11 26 20.4 1 118 64 - 0 51 59 - 0 43 55 - 0 55 36 - 0 40 18 .... - 18 0 0 - 1 20 46 11 26 20.5 2 118 65 - 1 24 48 - 1 16 44 - 1 28 25 - 1 13 7 0.11 - 17 0 0 - 1 53 37 11 26 20.7 3 118 66 - 1 57 39 - 1 49 35 - 2 1 16 - 1 45 58 0.09 - 16 0 0 - 2 26 29 11 26 20.9 4 118 68 - 2 30 31 - 2 22 27 - 2 34 8 - 2 18 50 0.08 - 15 0 0 - 2 59 21 11 26 21.3 6 118 69 - 3 3 24 - 2 55 19 - 3 7 1 - 2 51 42 0.07 - 14 0 0 - 3 32 13 11 26 21.7 7 118 70 - 3 36 15 - 3 28 11 - 3 39 52 - 3 24 33 0.07 - 13 0 0 - 4 5 2 11 26 22.2 8 118 71 - 4 9 5 - 4 1 0 - 4 12 42 - 3 57 23 0.06 - 12 0 0 - 4 37 49 11 26 22.7 9 118 72 - 4 41 51 - 4 33 47 - 4 45 28 - 4 30 10 0.06 - 11 0 0 - 5 10 32 11 26 23.4 10 118 73 - 5 14 34 - 5 6 30 - 5 18 11 - 5 2 53 0.06 - 10 0 0 - 5 43 11 11 26 24.1 11 118 74 - 5 47 13 - 5 39 9 - 5 50 49 - 5 35 32 0.06 - 9 0 0 - 6 15 43 11 26 24.9 12 118 76 - 6 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0.06 151 0 0 - 9 1 6 11 32 41.7 11 243 -52 - 9 5 7 - 8 57 5 - 9 8 43 - 8 53 30 0.06 152 0 0 - 8 29 21 11 32 42.4 10 242 -53 - 8 33 22 - 8 25 20 - 8 36 58 - 8 21 44 0.07 153 0 0 - 7 57 25 11 32 43.0 9 242 -54 - 8 1 26 - 7 53 24 - 8 5 2 - 7 49 48 0.07 154 0 0 - 7 25 20 11 32 43.6 8 242 -55 - 7 29 21 - 7 21 19 - 7 32 58 - 7 17 42 0.07 155 0 0 - 6 53 6 11 32 44.0 6 242 -56 - 6 57 8 - 6 49 5 - 7 0 44 - 6 45 28 0.08 156 0 0 - 6 20 45 11 32 44.4 5 242 -58 - 6 24 47 - 6 16 43 - 6 28 23 - 6 13 7 0.08 157 0 0 - 5 48 17 11 32 44.7 4 242 -59 - 5 52 19 - 5 44 15 - 5 55 56 - 5 40 39 0.09 158 0 0 - 5 15 44 11 32 45.0 3 242 -60 - 5 19 46 - 5 11 42 - 5 23 22 - 5 8 5 0.11 159 0 0 - 4 43 5 11 32 45.1 2 242 -61 - 4 47 7 - 4 39 3 - 4 50 44 - 4 35 26 0.15 160 0 0 - 4 10 23 11 32 45.2 1 242 -62 - 4 14 25 - 4 6 21 - 4 18 2 - 4 2 44 0.29 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6856-01788-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 19 10.0722 DE: -28 28 05.155 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 19 10.0721 DE: -28 28 05.155 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.6 * B mag [mag]: 10.5 * Diameter [mas]: 0.20 * 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]: 2.61980 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): 0.015", 0.002", 101.529° remarks: * orbital elements for (33729)1999 NJ21 : Mean anomaly = 39.2401916103 deg Arg. of pericenter = 155.8811082327 deg Long. of node = 90.1859081254 deg Inclination = 12.6659420681 deg Eccentricity = 0.1418060774 Semimajor axis = 2.6061968190 AU Perihelion dist = 2.2366222713 AU Mag: H = 13.19, G = 0.15 Epoch of elements : MJD 60607.47885088 TDT (2024 Oct 24.4789) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr25,0.39,2024,10,24,11.492428,-0.001713,-0.040366,18.679720,-0.646267,0.005035,-0.000046,-0.000001,0.000000 69.4331,-28.4592,3.65,-12.01,False TYC 6856-01788-1,18.31946455,-28.4680985,10.51,9.56,9.05,0.2,0,,18.34538725,-28.4592238,8.63,8.69,0,0,0 33729,1999 NJ21,18.19,13.053,2.6198,0,0,4.755,-2.16,,0.6,0 0,39.1280,2024,10,24,155.8811,90.1859,12.6659,0.14181,2.60620,2.23662,13.18,5.0,0.15 1.448,0.0153,0.0017,102,0.0031,Known errors,0.75,0,-1,-1 20241024_1788-1,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org