IOTA/IOTA-ES occultation update for (2355) Nei / UCAC4 280-167195 event on 2024 Jul 09, 08:04 UT Visible from Summary ------- On 2024 Jul 09 UT, the 16.464 km diameter asteroid (2355) Nei will occult a 9.8 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 6.03 mag to 15.86 mag (the magnitude of the asteroid) for at most 1.590 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: 81 * date and approx. time of event: 2024 Jul 09, 07:54 - 2024 Jul 09, 08:14 * geocentric midpoint of event [JD]: 2460500.83631721 * magnitude of target star: 9.83 * magnitude drop [mag]: 6.03 * estimated maximum duration [s]: 1.590 * Moon: 12 % sunlit, 124° distance * Sun: 161° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.66 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.003", 97°) * approx speed of asteroid's shadow [km/s]: 10.3378 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 280-167195 by 2355 Nei on 2024 Jul 9 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 133 0 0 2 11 29 8 14 23.7 0 124 14 2 17 0 2 5 58 2 24 17 1 58 41 .... 134 0 0 1 30 49 8 14 23.5 2 124 13 1 36 20 1 25 19 1 43 36 1 18 4 -0.03 135 0 0 0 50 31 8 14 23.0 3 124 12 0 56 0 0 45 1 1 3 15 0 37 47 -0.11 136 0 0 0 10 34 8 14 22.2 4 124 11 0 16 2 0 5 6 0 23 16 - 0 2 7 -0.14 137 0 0 - 0 28 59 8 14 21.1 5 124 10 - 0 23 32 - 0 34 27 - 0 16 20 - 0 41 38 -0.16 138 0 0 - 1 8 8 8 14 19.8 6 124 9 - 1 2 42 - 1 13 35 - 0 55 31 - 1 20 45 -0.17 139 0 0 - 1 46 52 8 14 18.3 8 124 7 - 1 41 27 - 1 52 17 - 1 34 18 - 1 59 26 -0.18 140 0 0 - 2 25 10 8 14 16.4 9 124 6 - 2 19 45 - 2 30 34 - 2 12 37 - 2 37 41 -0.18 141 0 0 - 3 3 0 8 14 14.3 10 124 5 - 2 57 37 - 3 8 23 - 2 50 30 - 3 15 29 -0.19 142 0 0 - 3 40 22 8 14 12.0 11 124 4 - 3 35 0 - 3 45 44 - 3 27 55 - 3 52 49 -0.19 143 0 0 - 4 17 16 8 14 9.4 12 124 3 - 4 11 55 - 4 22 37 - 4 4 51 - 4 29 40 -0.19 144 0 0 - 4 53 40 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2.7 34 231 -53 - 3 53 9 - 4 3 48 - 3 46 8 - 4 10 50 -0.21 - 83 0 0 - 3 22 3 7 55 55.7 33 231 -51 - 3 16 43 - 3 27 24 - 3 9 40 - 3 34 27 -0.21 - 82 0 0 - 2 45 11 7 55 48.9 32 231 -50 - 2 39 49 - 2 50 33 - 2 32 45 - 2 57 37 -0.21 - 81 0 0 - 2 7 53 7 55 42.3 31 231 -49 - 2 2 30 - 2 13 15 - 1 55 24 - 2 20 21 -0.21 - 80 0 0 - 1 30 9 7 55 35.9 30 231 -48 - 1 24 45 - 1 35 33 - 1 17 38 - 1 42 39 -0.21 - 79 0 0 - 0 52 1 7 55 29.7 29 231 -47 - 0 46 37 - 0 57 26 - 0 39 28 - 1 4 34 -0.21 - 78 0 0 - 0 13 30 7 55 23.6 28 231 -46 - 0 8 4 - 0 18 55 - 0 0 55 - 0 26 5 -0.21 - 77 0 0 0 25 24 7 55 17.8 26 231 -45 0 30 51 0 19 57 0 38 1 0 12 47 -0.21 - 76 0 0 1 4 39 7 55 12.2 25 231 -43 1 10 7 0 59 12 1 17 19 0 52 0 -0.21 - 75 0 0 1 44 15 7 55 6.8 24 231 -42 1 49 43 1 38 47 1 56 57 1 31 34 -0.21 - 74 0 0 2 24 10 7 55 1.7 23 231 -41 2 29 39 2 18 41 2 36 54 2 11 27 -0.21 - 73 0 0 3 4 23 7 54 56.8 22 231 -40 3 9 53 2 58 53 3 17 9 2 51 38 -0.21 - 72 0 0 3 44 53 7 54 52.1 21 231 -39 3 50 24 3 39 23 3 57 41 3 32 7 -0.21 - 71 0 0 4 25 39 7 54 47.7 19 231 -37 4 31 11 4 20 8 4 38 28 4 12 51 -0.21 - 70 0 0 5 6 40 7 54 43.5 18 232 -36 5 12 12 5 1 8 5 19 31 4 53 50 -0.21 - 69 0 0 5 47 53 7 54 39.5 17 232 -35 5 53 26 5 42 21 6 0 46 5 35 2 -0.21 - 68 0 0 6 29 19 7 54 35.8 16 232 -34 6 34 52 6 23 45 6 42 13 6 16 26 -0.21 - 67 0 0 7 10 55 7 54 32.4 15 232 -33 7 16 29 7 5 21 7 23 50 6 58 0 -0.21 - 66 0 0 7 52 40 7 54 29.2 13 232 -31 7 58 14 7 47 5 8 5 36 7 39 44 -0.21 - 65 0 0 8 34 32 7 54 26.3 12 232 -30 8 40 7 8 28 57 8 47 30 8 21 35 -0.21 - 64 0 0 9 16 31 7 54 23.7 11 232 -29 9 22 7 9 10 55 9 29 30 9 3 33 -0.21 - 63 0 0 9 58 34 7 54 21.4 10 233 -28 10 4 10 9 52 58 10 11 34 9 45 35 -0.21 - 62 0 0 10 40 41 7 54 19.3 9 233 -27 10 46 17 10 35 4 10 53 41 10 27 41 -0.21 - 61 0 0 11 22 49 7 54 17.5 7 233 -25 11 28 25 11 17 12 11 35 50 11 9 48 -0.21 - 60 0 0 12 4 57 7 54 15.9 6 233 -24 12 10 34 11 59 20 12 17 59 11 51 56 -0.21 - 59 0 0 12 47 3 7 54 14.7 5 233 -23 12 52 41 12 41 26 13 0 6 12 34 2 -0.21 - 58 0 0 13 29 7 7 54 13.7 4 234 -22 13 34 44 13 23 30 13 42 10 13 16 5 -0.20 - 57 0 0 14 11 6 7 54 13.0 3 234 -21 14 16 43 14 5 29 14 24 9 13 58 4 -0.20 - 56 0 0 14 52 59 7 54 12.5 1 234 -20 14 58 36 14 47 21 15 6 2 14 39 57 -0.18 - 55 0 0 15 34 44 7 54 12.3 0 234 -18 15 40 22 15 29 7 15 47 47 15 21 42 0.05 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 280-167195 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 07 55.2634 DE: -34 07 05.651 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 07 55.2633 DE: -34 07 05.652 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 9.8 * B mag [mag]: 10.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2355) Nei asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.012 distance from Earth [AU]: 1.82000 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.030", 0.003", 97.325° remarks: * orbital elements for (2355)Nei : Mean anomaly = 315.5359550281 deg Arg. of pericenter = 278.3740481028 deg Long. of node = 53.7833581552 deg Inclination = 9.9948007901 deg Eccentricity = 0.1120878202 Semimajor axis = 3.0222770942 AU Perihelion dist = 2.6835166426 AU Mag: H = 11.82, G = 0.15 Epoch of elements : MJD 60500.33631787 TDT (2024 Jul 09.3363) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,1.59,2024,7,9,8.071613,-0.026297,0.187809,-5.777789,-0.814760,0.001502,0.001019,0.000001,0.000000 -136.4381,-34.1156,60.26,22.28,False UCAC4 280-167195,18.13201760,-34.1182364,10.05,9.83,9.71,0.0,0,,18.15951361,-34.1156027,6.04,5.71,0,0,0 2355,Nei,15.86,16.464,1.8200,0,0,-2.247,-3.94,,2.0,0 0,315.4729,2024,7,9,278.3740,53.7834,9.9948,0.11209,3.02228,2.68352,11.82,5.0,0.15 1.659,0.0297,0.0026,97,0.0083,Known errors,1.49,0,-1,-1 20240709_167195,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org