IOTA/IOTA-ES occultation update for (7037) Davidlean / UCAC4 356-161402 event on 2024 Oct 08, 23:15 UT Visible from Summary ------- On 2024 Oct 08 UT, the 17.4388402479092 km diameter asteroid (7037) Davidlean 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 6.06 mag to 17.83 mag (the magnitude of the asteroid) for at most 0.900 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 Oct 08, 23:10 - 2024 Oct 08, 23:20 * geocentric midpoint of event [JD]: 2460592.46895984 * magnitude of target star: 11.77 * magnitude drop [mag]: 6.06 * estimated maximum duration [s]: 0.900 * Moon: 31 % sunlit, 20° distance * Sun: 85° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.001", 73°) * approx speed of asteroid's shadow [km/s]: 19.7143 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 356-161402 by 7037 Davidlean on 2024 Oct 8 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 172 0 0 -36 6 2 23 10 37.3 0 113 56 -36 12 4 -36 0 1 -36 16 19 -35 55 47 .... 173 0 0 -36 27 11 23 10 37.4 1 113 57 -36 33 12 -36 21 10 -36 37 27 -36 16 56 0.51 174 0 0 -36 48 9 23 10 37.6 2 112 57 -36 54 10 -36 42 8 -36 58 24 -36 37 54 0.53 175 0 0 -37 8 55 23 10 37.9 3 111 57 -37 14 56 -37 2 55 -37 19 11 -36 58 41 0.55 176 0 0 -37 29 30 23 10 38.2 4 111 57 -37 35 31 -37 23 30 -37 39 45 -37 19 17 0.55 177 0 0 -37 49 54 23 10 38.7 5 110 57 -37 55 54 -37 43 54 -38 0 8 -37 39 41 0.56 178 0 0 -38 10 4 23 10 39.2 6 110 57 -38 16 4 -38 4 5 -38 20 18 -37 59 52 0.56 179 0 0 -38 30 2 23 10 39.8 7 109 57 -38 36 2 -38 24 3 -38 40 15 -38 19 50 0.56 -180 0 0 -38 49 47 23 10 40.5 7 108 57 -38 55 46 -38 43 48 -38 59 59 -38 39 36 0.56 -179 0 0 -39 9 18 23 10 41.2 8 108 56 -39 15 17 -39 3 20 -39 19 30 -38 59 8 0.57 -178 0 0 -39 28 36 23 10 42.0 9 107 56 -39 34 34 -39 22 38 -39 38 47 -39 18 26 0.57 -177 0 0 -39 47 40 23 10 42.9 10 106 56 -39 53 37 -39 41 42 -39 57 50 -39 37 31 0.57 -176 0 0 -40 6 29 23 10 43.9 11 106 56 -40 12 26 -40 0 32 -40 16 38 -39 56 21 0.57 -175 0 0 -40 25 4 23 10 45.0 12 105 56 -40 31 1 -40 19 7 -40 35 12 -40 14 56 0.57 -174 0 0 -40 43 24 23 10 46.1 12 104 56 -40 49 20 -40 37 28 -40 53 31 -40 33 17 0.57 -173 0 0 -41 1 29 23 10 47.3 13 104 55 -41 7 25 -40 55 33 -41 11 36 -40 51 23 0.57 -172 0 0 -41 19 18 23 10 48.5 14 103 55 -41 25 14 -41 13 23 -41 29 24 -41 9 13 0.57 -171 0 0 -41 36 53 23 10 49.8 15 102 55 -41 42 47 -41 30 58 -41 46 58 -41 26 49 0.57 -170 0 0 -41 54 11 23 10 51.2 16 102 55 -42 0 5 -41 48 17 -42 4 15 -41 44 8 0.57 -169 0 0 -42 11 14 23 10 52.6 16 101 54 -42 17 7 -42 5 20 -42 21 17 -42 1 11 0.57 -168 0 0 -42 28 0 23 10 54.1 17 100 54 -42 33 53 -42 22 7 -42 38 3 -42 17 59 0.57 -167 0 0 -42 44 30 23 10 55.7 18 100 54 -42 50 23 -42 38 38 -42 54 32 -42 34 30 0.57 -166 0 0 -43 0 44 23 10 57.3 19 99 53 -43 6 37 -42 54 53 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19 38.3 19 258 -53 -27 26 5 -27 14 1 -27 30 20 -27 9 47 0.60 - 8 0 0 -26 56 38 23 19 40.3 18 258 -54 -27 2 40 -26 50 37 -27 6 55 -26 46 22 0.60 - 7 0 0 -26 33 16 23 19 42.3 17 257 -55 -26 39 18 -26 27 15 -26 43 33 -26 23 1 0.60 - 6 0 0 -26 9 57 23 19 44.2 16 257 -55 -26 15 58 -26 3 56 -26 20 13 -25 59 42 0.60 - 5 0 0 -25 46 42 23 19 45.9 15 256 -56 -25 52 43 -25 40 42 -25 56 57 -25 36 28 0.61 - 4 0 0 -25 23 31 23 19 47.6 14 256 -57 -25 29 32 -25 17 31 -25 33 46 -25 13 18 0.61 - 3 0 0 -25 0 26 23 19 49.1 13 255 -57 -25 6 26 -24 54 26 -25 10 40 -24 50 13 0.61 - 2 0 0 -24 37 26 23 19 50.6 12 255 -58 -24 43 26 -24 31 27 -24 47 40 -24 27 14 0.61 - 1 0 0 -24 14 33 23 19 51.9 11 254 -59 -24 20 32 -24 8 34 -24 24 45 -24 4 21 0.62 0 0 0 -23 51 46 23 19 53.1 10 254 -59 -23 57 45 -23 45 47 -24 1 58 -23 41 35 0.62 1 0 0 -23 29 7 23 19 54.3 9 253 -60 -23 35 5 -23 23 9 -23 39 18 -23 18 57 0.62 2 0 0 -23 6 36 23 19 55.3 9 253 -60 -23 12 34 -23 0 38 -23 16 47 -22 56 27 0.63 3 0 0 -22 44 14 23 19 56.2 8 253 -61 -22 50 11 -22 38 16 -22 54 23 -22 34 5 0.64 4 0 0 -22 22 1 23 19 57.0 7 252 -61 -22 27 58 -22 16 4 -22 32 9 -22 11 53 0.64 5 0 0 -21 59 57 23 19 57.7 6 252 -62 -22 5 54 -21 54 1 -22 10 5 -21 49 50 0.66 6 0 0 -21 38 4 23 19 58.3 5 251 -62 -21 44 1 -21 32 9 -21 48 12 -21 27 58 0.67 7 0 0 -21 16 22 23 19 58.7 4 251 -62 -21 22 18 -21 10 27 -21 26 29 -21 6 17 0.70 8 0 0 -20 54 52 23 19 59.1 3 251 -63 -21 0 47 -20 48 57 -21 4 57 -20 44 48 0.75 9 0 0 -20 33 33 23 19 59.3 2 250 -63 -20 39 28 -20 27 39 -20 43 38 -20 23 30 0.86 10 0 0 -20 12 27 23 19 59.4 1 250 -63 -20 18 21 -20 6 34 -20 22 31 -20 2 25 1.40 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 356-161402 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 44 24.2139 DE: -18 57 36.551 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 44 24.2139 DE: -18 57 36.551 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7037) Davidlean asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.98040 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): 0.018", 0.001", 73.303° remarks: * orbital elements for (7037)Davidlean : Mean anomaly = 75.3555954191 deg Arg. of pericenter = 293.5168615365 deg Long. of node = 278.8057565033 deg Inclination = 11.0896998046 deg Eccentricity = 0.1075915221 Semimajor axis = 3.1044676319 AU Perihelion dist = 2.7704532342 AU Mag: H = 12.08, G = 0.15 Epoch of elements : MJD 60591.96895984 TDT (2024 Oct 08.9690) ------ occelmnt file for Occult BEGIN ----------------------------------- <Occultations> <Event> <Elements>JPL#582023Apr25,0.90,2024,10,8,23.255036,0.072667,-0.488267,11.005050,1.644781,0.005789,0.000504,0.000000,0.000000</Elements> <Earth>-85.4361,-18.9354,-172.00,-6.36,False</Earth> <Star>UCAC4 356-161402,18.74005944,-18.9601529,12.76,11.77,11.24,0.1,0,,18.76422535,-18.9354463,6.07,6.15,0,0,0</Star> <Object>7037,Davidlean,17.83,17.655,2.9804,0,0,2.289,4.86,,1.2,0</Object> <Orbit>0,75.1810,2024,10,8,293.5169,278.8058,11.0897,0.10759,3.10447,2.77045,12.07,5.0,0.15</Orbit> <Errors>1.352,0.0177,0.0014,73,0.0029,Known errors,0.90,0,-1,-1</Errors> <ID>20241008_161402,60140.62</ID> </Event> </Occultations> ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org