IOTA/IOTA-ES occultation update for (1271) Isergina / UCAC4 343-129924 event on 2024 Oct 31, 08:53 UT Visible from Summary ------- On 2024 Oct 31 UT, the 50.112 km diameter asteroid (1271) Isergina 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 4.82 mag to 16.65 mag (the magnitude of the asteroid) for at most 1.510 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: 99 * date and approx. time of event: 2024 Oct 31, 08:50 - 2024 Oct 31, 08:56 * geocentric midpoint of event [JD]: 2460614.87032242 * magnitude of target star: 11.84 * magnitude drop [mag]: 4.82 * estimated maximum duration [s]: 1.510 * Moon: 1 % sunlit, 67° distance * Sun: 54° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 95°) * approx speed of asteroid's shadow [km/s]: 33.0877 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 343-129924 by 1271 Isergina on 2024 Oct 31 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 9 0 0 - 4 48 13 8 50 5.1 1 111 55 - 5 3 0 - 4 33 27 - 5 6 14 - 4 30 12 .... 10 0 0 - 5 11 59 8 50 5.2 2 111 56 - 5 26 46 - 4 57 13 - 5 30 1 - 4 53 58 0.18 11 0 0 - 5 35 50 8 50 5.3 3 111 57 - 5 50 37 - 5 21 3 - 5 53 52 - 5 17 48 0.17 12 0 0 - 5 59 43 8 50 5.5 4 111 58 - 6 14 31 - 5 44 56 - 6 17 46 - 5 41 41 0.16 13 0 0 - 6 23 40 8 50 5.8 5 111 59 - 6 38 28 - 6 8 52 - 6 41 43 - 6 5 37 0.16 14 0 0 - 6 47 38 8 50 6.2 6 111 60 - 7 2 27 - 6 32 51 - 7 5 42 - 6 29 36 0.16 15 0 0 - 7 11 39 8 50 6.6 7 111 61 - 7 26 27 - 6 56 51 - 7 29 43 - 6 53 36 0.15 16 0 0 - 7 35 40 8 50 7.1 8 111 62 - 7 50 29 - 7 20 52 - 7 53 44 - 7 17 37 0.15 17 0 0 - 7 59 42 8 50 7.6 9 111 63 - 8 14 31 - 7 44 54 - 8 17 46 - 7 41 39 0.15 18 0 0 - 8 23 44 8 50 8.2 10 110 64 - 8 38 33 - 8 8 56 - 8 41 48 - 8 5 41 0.15 19 0 0 - 8 47 45 8 50 8.9 11 110 65 - 9 2 34 - 8 32 57 - 9 5 49 - 8 29 42 0.15 20 0 0 - 9 11 45 8 50 9.7 12 110 67 - 9 26 34 - 8 56 57 - 9 29 49 - 8 53 41 0.15 21 0 0 - 9 35 43 8 50 10.5 13 110 68 - 9 50 32 - 9 20 55 - 9 53 47 - 9 17 39 0.15 22 0 0 - 9 59 38 8 50 11.4 15 110 69 -10 14 27 - 9 44 50 -10 17 42 - 9 41 35 0.15 23 0 0 -10 23 31 8 50 12.3 16 110 70 -10 38 19 -10 8 43 -10 41 35 -10 5 28 0.15 24 0 0 -10 47 20 8 50 13.3 17 109 71 -11 2 8 -10 32 32 -11 5 23 -10 29 17 0.15 25 0 0 -11 11 4 8 50 14.4 18 109 72 -11 25 52 -10 56 17 -11 29 8 -10 53 2 0.15 26 0 0 -11 34 44 8 50 15.5 19 109 73 -11 49 32 -11 19 57 -11 52 47 -11 16 42 0.15 27 0 0 -11 58 19 8 50 16.7 20 109 74 -12 13 6 -11 43 32 -12 16 21 -11 40 17 0.15 28 0 0 -12 21 47 8 50 17.9 21 108 75 -12 36 35 -12 7 1 -12 39 50 -12 3 46 0.15 29 0 0 -12 45 10 8 50 19.3 22 108 76 -12 59 56 -12 30 24 -13 3 11 -12 27 9 0.15 30 0 0 -13 8 25 8 50 20.6 23 108 77 -13 23 11 -12 53 40 -13 26 26 -12 50 25 0.15 31 0 0 -13 31 33 8 50 22.1 24 108 78 -13 46 19 -13 16 48 -13 49 34 -13 13 33 0.15 32 0 0 -13 54 33 8 50 23.5 25 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47 8 56 22.3 12 251 -40 -15 15 30 -14 46 4 -15 18 44 -14 42 51 0.16 -178 0 0 -14 38 19 8 56 23.1 11 251 -41 -14 53 2 -14 23 35 -14 56 16 -14 20 21 0.16 -177 0 0 -14 15 41 8 56 23.7 10 250 -42 -14 30 25 -14 0 57 -14 33 39 -13 57 43 0.17 -176 0 0 -13 52 54 8 56 24.3 9 250 -43 -14 7 39 -13 38 10 -14 10 54 -13 34 56 0.17 -175 0 0 -13 29 59 8 56 24.8 8 250 -44 -13 44 45 -13 15 14 -13 47 59 -13 12 0 0.17 -174 0 0 -13 6 56 8 56 25.3 7 250 -45 -13 21 42 -12 52 11 -13 24 57 -12 48 57 0.18 -173 0 0 -12 43 46 8 56 25.7 6 249 -46 -12 58 32 -12 29 0 -13 1 47 -12 25 46 0.18 -172 0 0 -12 20 29 8 56 26.1 5 249 -47 -12 35 16 -12 5 43 -12 38 31 -12 2 28 0.19 -171 0 0 -11 57 6 8 56 26.4 4 249 -48 -12 11 53 -11 42 19 -12 15 8 -11 39 4 0.20 -170 0 0 -11 33 37 8 56 26.6 3 249 -49 -11 48 24 -11 18 50 -11 51 39 -11 15 35 0.22 -169 0 0 -11 10 2 8 56 26.7 2 249 -50 -11 24 50 -10 55 15 -11 28 5 -10 52 0 0.26 -168 0 0 -10 46 23 8 56 26.8 1 248 -51 -11 1 11 -10 31 36 -11 4 26 -10 28 21 0.42 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 343-129924 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 09 57.9281 DE: -21 24 29.565 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 09 57.9281 DE: -21 24 29.565 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1271) Isergina asteroid class: approx. diameter [km]: 50 approx. diameter ["]: 0.019 distance from Earth [AU]: 3.72400 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 date of fit: 2023 Apr 24 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): 0.014", 0.002", 95.027° remarks: * orbital elements for (1271)Isergina : Mean anomaly = 260.6212785547 deg Arg. of pericenter = 272.3950522197 deg Long. of node = 126.8093934817 deg Inclination = 6.6830675575 deg Eccentricity = 0.1211305806 Semimajor axis = 3.1405608416 AU Perihelion dist = 2.7601428834 AU Mag: H = 10.43, G = 0.15 Epoch of elements : MJD 60614.37032216 TDT (2024 Oct 31.3703) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Apr24,1.51,2024,10,31,8.887738,-0.008303,-0.139560,18.647161,-1.030203,0.004843,0.000219,-0.000001,0.000000 99.3894,-21.4043,42.58,-14.31,False UCAC4 343-129924,18.16609119,-21.4082125,12.52,11.84,11.47,0.0,0,,18.19060897,-21.4042500,4.83,4.74,0,0,0 1271,Isergina,16.65,50.112,3.7240,0,0,3.153,-2.43,,2.2,0 0,260.5557,2024,10,31,272.3951,126.8094,6.6831,0.12113,3.14056,2.76014,10.43,5.0,0.15 1.110,0.0137,0.0020,95,0.0020,Known errors,0.86,0,-1,-1 20241031_129924,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org