IOTA/IOTA-ES occultation update for (8917) Tianjindaxue / UCAC4 366-128281 event on 2024 Nov 01, 01:26 UT Visible from Summary ------- On 2024 Nov 01 UT, the 38.039 km diameter asteroid (8917) Tianjindaxue will occult a 11.8 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 6.33 mag to 18.14 mag (the magnitude of the asteroid) for at most 1.280 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 Nov 01, 01:22 - 2024 Nov 01, 01:29 * geocentric midpoint of event [JD]: 2460615.55975646 * magnitude of target star: 11.81 * magnitude drop [mag]: 6.33 * estimated maximum duration [s]: 1.280 * Moon: 0 % sunlit, 64° distance * Sun: 58° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 71°) * approx speed of asteroid's shadow [km/s]: 29.7375 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 366-128281 by 8917 Tianjindaxue on 2024 Nov 1 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 115 0 0 -33 55 54 1 22 58.1 0 110 49 -34 8 41 -33 43 10 -34 17 29 -33 34 25 .... 116 0 0 -34 14 25 1 22 58.1 1 109 50 -34 27 11 -34 1 41 -34 36 0 -33 52 56 0.50 117 0 0 -34 32 50 1 22 58.2 2 109 50 -34 45 36 -34 20 5 -34 54 24 -34 11 21 0.54 118 0 0 -34 51 7 1 22 58.4 3 108 51 -35 3 53 -34 38 23 -35 12 41 -34 29 39 0.55 119 0 0 -35 9 18 1 22 58.7 4 108 52 -35 22 3 -34 56 34 -35 30 51 -34 47 50 0.56 120 0 0 -35 27 21 1 22 59.0 5 107 52 -35 40 6 -35 14 37 -35 48 53 -35 5 53 0.57 121 0 0 -35 45 16 1 22 59.3 6 107 53 -35 58 0 -35 32 33 -36 6 47 -35 23 49 0.57 122 0 0 -36 3 3 1 22 59.7 7 106 53 -36 15 47 -35 50 20 -36 24 34 -35 41 37 0.57 123 0 0 -36 20 41 1 23 0.2 7 105 54 -36 33 25 -36 7 59 -36 42 11 -35 59 16 0.57 124 0 0 -36 38 10 1 23 0.7 8 105 55 -36 50 53 -36 25 29 -36 59 40 -36 16 46 0.58 125 0 0 -36 55 30 1 23 1.3 9 104 55 -37 8 13 -36 42 49 -37 16 59 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8 0.62 - 62 0 0 -28 46 11 1 29 1.2 14 258 -35 -28 58 57 -28 33 27 -29 7 45 -28 24 42 0.62 - 61 0 0 -28 26 45 1 29 2.1 13 258 -36 -28 39 30 -28 14 1 -28 48 18 -28 5 16 0.62 - 60 0 0 -28 7 20 1 29 3.0 12 257 -36 -28 20 5 -27 54 36 -28 28 53 -27 45 52 0.62 - 59 0 0 -27 47 57 1 29 3.8 11 257 -37 -28 0 42 -27 35 14 -28 9 29 -27 26 30 0.63 - 58 0 0 -27 28 36 1 29 4.5 10 256 -38 -27 41 21 -27 15 54 -27 50 8 -27 7 10 0.63 - 57 0 0 -27 9 18 1 29 5.2 9 256 -39 -27 22 2 -26 56 36 -27 30 49 -26 47 53 0.64 - 56 0 0 -26 50 4 1 29 5.8 8 255 -40 -27 2 47 -26 37 22 -27 11 34 -26 28 39 0.64 - 55 0 0 -26 30 53 1 29 6.3 7 255 -41 -26 43 36 -26 18 12 -26 52 22 -26 9 29 0.65 - 54 0 0 -26 11 46 1 29 6.8 6 254 -41 -26 24 29 -25 59 6 -26 33 14 -25 50 23 0.66 - 53 0 0 -25 52 44 1 29 7.2 5 254 -42 -26 5 26 -25 40 4 -26 14 11 -25 31 22 0.67 - 52 0 0 -25 33 47 1 29 7.6 4 253 -43 -25 46 29 -25 21 8 -25 55 13 -25 12 26 0.69 - 51 0 0 -25 14 56 1 29 7.8 3 253 -44 -25 27 37 -25 2 17 -25 36 21 -24 53 36 0.72 - 50 0 0 -24 56 11 1 29 8.0 2 252 -44 -25 8 51 -24 43 32 -25 17 34 -24 34 52 0.78 - 49 0 0 -24 37 32 1 29 8.1 1 252 -45 -24 50 11 -24 24 54 -24 58 55 -24 16 14 0.92 - 48 0 0 -24 19 0 1 29 8.2 0 252 -46 -24 31 39 -24 6 23 -24 40 22 -23 57 43 2.05 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 366-128281 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 29 09.4059 DE: -16 51 04.125 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 29 09.4059 DE: -16 51 04.125 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (8917) Tianjindaxue asteroid class: approx. diameter [km]: 38 approx. diameter ["]: 0.013 distance from Earth [AU]: 4.12910 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 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", 0.003", 71.156° remarks: * orbital elements for (8917)Tianjindaxue : Mean anomaly = 227.0719754993 deg Arg. of pericenter = 169.7730803825 deg Long. of node = 263.3888556090 deg Inclination = 15.4840614281 deg Eccentricity = 0.1198849813 Semimajor axis = 3.4063646239 AU Perihelion dist = 2.9979926647 AU Mag: H = 11.45, G = 0.15 Epoch of elements : MJD 60615.05975641 TDT (2024 Nov 01.0598) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr25,1.28,2024,11,1,1.434155,0.043658,-0.501832,16.719974,1.472308,0.005101,0.000627,-0.000001,0.000000 -144.7007,-16.8354,154.38,-14.54,False UCAC4 366-128281,18.48594611,-16.8511458,12.55,11.81,11.41,0.0,0,,18.50965608,-16.8353872,6.34,6.29,0,0,0 8917,Tianjindaxue,18.14,38.039,4.1291,0,0,2.480,3.14,,2.0,0 0,226.9058,2024,10,31,169.7731,263.3889,15.4841,0.11988,3.40636,2.99799,11.45,5.0,0.15 1.344,0.0147,0.0027,71,0.0044,Known errors,1.68,0,-1,-1 20241101_128281,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org