IOTA/IOTA-ES occultation update for (5648) 1990 VU1 / UCAC4 290-177458 event on 2022 May 27, 09:25 UT Visible from South America Summary ------- On 2022 May 27 UT, the 59.3 km diameter asteroid (5648) 1990 VU1 will occult a 12.1 mag star in the constellation Sagittarius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.59 mag to 16.63 mag (the magnitude of the asteroid) for at most 4.130 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: 56 * date and approx. time of event: 2022 May 27, 09:18 - 2022 May 27, 09:32 * geocentric midpoint of event [JD]: 2459726.89275671 * magnitude of target star: 12.06 * magnitude drop [mag]: 4.59 * estimated maximum duration [s]: 4.130 * Moon: 9 % sunlit, 117° distance * Sun: 150° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 1.11 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.003", 109°) * approx speed of asteroid's shadow [km/s]: 14.3718 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 290-177458 by 5648 1990 VU1 on 2022 May 27 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 ' " Longitude Longitude Longitude Longitude .. .. .. 2 0 0 .. .. .... .. .. .. - 20 48 23 ... .. .. ... .. .. ... .. .. .... - 21 47 39 1 0 0 9 19 10.4 1 238 27 - 22 21 7 - 21 13 50 ... .. .. ... .. .. .... - 23 17 41 0 0 0 9 19 11.1 3 238 25 - 23 50 16 - 22 44 47 - 25 1 29 - 21 30 36 0.46 - 24 44 26 - 1 0 0 9 19 12.2 5 238 23 - 25 16 14 - 24 12 20 - 26 25 49 - 23 0 4 0.50 Latitude Latitude Latitude Latitude - 26 0 0 - 1 54 2 9 19 13.6 7 238 22 - 1 31 22 - 2 16 49 - 0 41 25 - 3 7 44 0.52 - 27 0 0 - 2 38 6 9 19 15.0 8 238 21 - 2 15 14 - 3 1 4 - 1 24 53 - 3 52 25 0.54 - 28 0 0 - 3 23 11 9 19 16.6 9 238 20 - 3 0 8 - 3 46 20 - 2 9 22 - 4 38 7 0.54 - 29 0 0 - 4 9 17 9 19 18.5 10 238 18 - 3 46 2 - 4 32 38 - 2 54 52 - 5 24 52 0.54 - 30 0 0 - 4 56 23 9 19 20.6 12 238 17 - 4 32 57 - 5 19 57 - 3 41 21 - 6 12 37 0.54 - 31 0 0 - 5 44 30 9 19 23.0 13 238 16 - 5 20 51 - 6 8 15 - 4 28 49 - 7 1 24 0.55 - 32 0 0 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-22 -63 15 38 -64 8 47 -62 17 29 -65 8 35 0.59 133 0 0 -63 13 54 9 31 30.2 18 126 -22 -62 47 11 -63 40 49 -61 48 30 -64 41 11 0.59 132 0 0 -62 44 43 9 31 32.0 18 127 -21 -62 17 44 -63 11 52 -61 18 31 -64 12 49 0.59 131 0 0 -62 14 30 9 31 33.9 17 127 -21 -61 47 17 -62 41 55 -60 47 33 -63 43 26 0.59 130 0 0 -61 43 16 9 31 35.7 16 128 -20 -61 15 48 -62 10 55 -60 15 32 -63 13 1 0.59 129 0 0 -61 10 57 9 31 37.5 16 129 -20 -60 43 15 -61 38 52 -59 42 28 -62 41 32 0.60 128 0 0 -60 37 33 9 31 39.2 15 130 -19 -60 9 37 -61 5 43 -59 8 18 -62 8 57 0.60 127 0 0 -60 3 3 9 31 40.9 14 131 -19 -59 34 51 -60 31 27 -58 33 2 -61 35 14 0.60 126 0 0 -59 27 23 9 31 42.6 13 132 -18 -58 58 58 -59 56 2 -57 56 39 -61 0 22 0.60 125 0 0 -58 50 34 9 31 44.2 13 133 -17 -58 21 55 -59 19 27 -57 19 6 -60 24 19 0.60 124 0 0 -58 12 34 9 31 45.8 12 134 -17 -57 43 41 -58 41 40 -56 40 24 -59 47 4 0.61 123 0 0 -57 33 21 9 31 47.3 11 135 -16 -57 4 15 -58 2 41 -56 0 30 -59 8 36 0.61 122 0 0 -56 52 55 9 31 48.8 10 135 -15 -56 23 36 -57 22 27 -55 19 23 -58 28 53 0.61 121 0 0 -56 11 14 9 31 50.1 9 136 -15 -55 41 43 -56 40 59 -54 37 4 -57 47 53 0.62 120 0 0 -55 28 18 9 31 51.4 8 137 -14 -54 58 35 -55 58 15 -53 53 31 -57 5 37 0.62 119 0 0 -54 44 6 9 31 52.5 7 138 -13 -54 14 12 -55 14 14 -53 8 43 -56 22 2 0.63 118 0 0 -53 58 37 9 31 53.6 6 139 -12 -53 28 33 -54 28 56 -52 22 41 -55 37 10 0.64 117 0 0 -53 11 52 9 31 54.5 5 140 -11 -52 41 38 -53 42 21 -51 35 25 -54 50 58 0.66 116 0 0 -52 23 50 9 31 55.3 4 140 -11 -51 53 26 -52 54 29 -50 46 54 -54 3 27 0.68 115 0 0 -51 34 31 9 31 56.0 3 141 -10 -51 3 59 -52 5 19 -49 57 8 -53 14 37 0.71 114 0 0 -50 43 56 9 31 56.5 2 142 -9 -50 13 16 -51 14 52 .. .. .. -52 24 28 0.78 113 0 0 -49 52 6 9 31 56.8 1 143 -8 -49 21 19 -50 23 8 .. .. .. -51 33 1 0.97 112 0 0 -48 59 1 9 31 56.9 0 143 -7 .. .. .. -49 30 10 .. .. .. -50 40 16 3.44 Uncertainty in time = +/- 6 secs Prediction of 2022 Mar 27.1 Data for the target star ------------------------ * name: UCAC4 290-177458 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 19 34.4609 DE: -32 08 17.075 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 19 34.4610 DE: -32 08 17.075 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5648) 1990 VU1 asteroid class: approx. diameter [km]: 59 approx. diameter ["]: 0.021 distance from Earth [AU]: 3.82850 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 date of fit: 2021 Nov 10 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", 108.914° remarks: * orbital elements for (5648)1990 VU1 : Mean anomaly = 306.7770841938 deg Arg. of pericenter = 269.0755503750 deg Long. of node = 71.0381239453 deg Inclination = 22.7052122139 deg Eccentricity = 0.1669491010 Semimajor axis = 5.1435565643 AU Perihelion dist = 4.2848444202 AU Mag: H = 9.86, G = 0.15 Epoch of elements : MJD 59726.39298611 TDT (2022 May 27.3930) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482021Nov10,4.13,2022,5,27,9.426161,0.267511,-0.424737,-6.861981,-4.326064,-0.002820,0.000679,0.000001,0.000000 -111.0506,-32.1281,37.90,21.32,False UCAC4 290-177458,18.32623916,-32.1380765,0.00,12.06,0.00,0.0,0,,18.35065616,-32.1280837,4.58,0.00,0,0,0 5648,1990 VU1,16.63,59.3,3.8285,0,0,-1.241,-9.94,,6.0 0,306.7439,2022,5,27,269.0756,71.0381,22.7052,0.16695,5.14356,4.28484,9.86,5.0,0.15 2.109,0.0303,0.0028,109,0.0237,Known errors,-1.00,-1,-1,-1 20220527_177458,59665.10 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Mar 27, 02:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org