1215:
954:
Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the
Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry".
1000:
Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results".
847:
Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt
Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters".
899:
Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of
Spectrophotometrically Classified Asteroids: Preliminary Results".
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32:
295:
1393:
224:
1552:
482:, approximately 3 kilometers (2 miles) in diameter. It was discovered on 29 September 1999, by Italian amateur astronomer
1624:
1236:
1378:
671:
1049:
Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and
Dynamical Properties of Asteroid Families".
782:
1542:
1532:
820:
1537:
758:
646:
assumes a standard albedo for a stony asteroid of 0.20, and calculates a diameter of 2.45 kilometers based on an
605:
44:
1373:
70:
1614:
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1353:
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722:
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307:
178:
1197:
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1150:
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974:
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866:
565:
541:
235:
1189:
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1156:
683:
639:
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545:
284:
1054:
1010:
964:
908:
856:
679:
647:
417:
1244:
572:
in April 1954, more than 45 years prior to its official discovery observation at Campo Catino.
1436:
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618:
533:
521:
206:
166:
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375:
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609:
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186:
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1466:
1431:
1252:
1127:
663:
549:
265:
246:
1131:
1603:
1522:
1421:
1416:
986:
930:
878:
675:
667:
499:
483:
479:
86:
37:
1588:
1361:
659:
529:
258:
144:
128:
1032:
754:
1578:
1527:
1488:
511:
273:
150:
1547:
1493:
597:
170:
1583:
1473:
1322:
561:
334:
134:
682:
when he was 8 years old. The official naming citation was published by the
1267:
1403:
553:
631:
525:
516:
638:, Masi measures 3.150 kilometers in diameter and its surface has an
612:
of 13.862 hours with a relatively high brightness amplitude of 0.68
1059:
1015:
969:
1514:
913:
861:
366:
1326:
1271:
1151:
520:), located in the Nysa–Polana complex and one of the largest
16:
Nysian asteroid from the inner regions of the asteroid belt
755:"JPL Small-Body Database Browser: 21795 Masi (1999 SN9)"
498:
of 13.86 hours. It was named for
Italian astronomer
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80:
68:
63:
55:
43:
31:
26:
604:observations in the R-band by astronomers at the
1044:
1042:
949:
947:
945:
842:
840:
838:
1338:
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588:for members of the Nysa family of asteroids.
536:once every 3 years and 8 months (1,342 days;
8:
717:
715:
713:
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709:
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705:
21:
630:According to the survey carried out by the
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1276:
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1213:
608:in California. Lightcurve analysis gave a
1058:
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749:
747:
745:
743:
777:
775:
532:main-belt at a distance of 1.9–2.8
1630:Astronomical objects discovered in 1999
1610:Minor planet object articles (numbered)
1077:10.2458/azu_uapress_9780816532131-ch016
701:
894:
892:
890:
888:
815:
813:
811:
809:
807:
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644:Collaborative Asteroid Lightcurve Link
20:
823:. Asteroid Lightcurve Database (LCDB)
488:Campo Catino Astronomical Observatory
296:Longitude of ascending node
7:
1218:
1128:Asteroid Lightcurve Database (LCDB)
636:Wide-field Infrared Survey Explorer
540:of 2.38 AU). Its orbit has an
524:of the asteroid belt, named after
14:
1161:AstDyS-2, Asteroids—Dynamic Site
1145:Dictionary of Minor Planet Names
596:In September 2010, a rotational
670:(born 1972), a researcher and
478:from the inner regions of the
1:
1620:Discoveries by Franco Mallia
1033:10.1016/j.icarus.2015.08.007
821:"LCDB Data for (21795) Masi"
584:, which is also the overall
490:in Lazio, Italy. The likely
672:discoverer of minor planets
528:. It orbits the Sun in the
308:Argument of perihelion
1646:
987:10.1088/0004-6256/150/3/75
931:10.1088/0004-637X/741/2/90
879:10.1088/0004-637X/741/2/68
600:of Masi was obtained from
580:Masi is an assumed, stony
129:Minor planet category
1369:
1354:Small Solar System bodies
1305:
901:The Astrophysical Journal
849:The Astrophysical Journal
759:Jet Propulsion Laboratory
606:Palomar Transient Factory
453:
247:Orbital period (sidereal)
177:
165:
1137:16 December 2017 at the
957:The Astronomical Journal
787:Small Bodies Data Ferret
757:(2017-09-27 last obs.).
662:was named after Italian
576:Physical characteristics
506:Orbit and classification
418:Absolute magnitude
319:Physical characteristics
100:Alternative designations
1299:Minor planets navigator
1210:JPL Small-Body Database
723:"21795 Masi (1999 SN9)"
464:provisional designation
355:Synodic rotation period
159:Orbital characteristics
1479:Trans-Neptunian object
1174:Observation prediction
510:Masi is member of the
1153:– Minor Planet Center
1101:"MPC/MPO/MPS Archive"
783:"Asteroid 21795 Masi"
678:, who became an avid
179:Uncertainty parameter
1452:Distant minor planet
1053:. pp. 297–321.
642:of 0.235, while the
566:Digitized Sky Survey
552:with respect to the
92:(Italian astronomer)
71:MPC designation
1625:Named minor planets
1261:Physical parameters
1105:Minor Planet Center
1069:2015aste.book..297N
1025:2015Icar..261...34V
979:2015AJ....150...75W
923:2011ApJ...741...90M
871:2011ApJ...741...68M
727:Minor Planet Center
684:Minor Planet Center
626:Diameter and albedo
570:Palomar Observatory
56:Discovery date
45:Discovery site
23:
1198:Observational info
680:amateur astronomer
648:absolute magnitude
634:mission of NASA's
33:Discovered by
1597:
1596:
1509:
1508:
1394:Meanings of names
1320:
1319:
568:and taken at the
564:published by the
522:asteroid families
457:
456:
252:3.68 yr (1,342 d)
59:29 September 1999
50:Campo Catino Obs.
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1253:Orbital elements
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666:and astronomer,
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411:
394:
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386:
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376:Geometric albedo
369:
364:
348:
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279:0° 16 5.52 / day
148:
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27:Discovery
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1190:Proper elements
1139:Wayback Machine
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686:on 9 May 2001 (
656:
628:
617:
610:rotation period
594:
592:Rotation period
582:S-type asteroid
578:
558:observation arc
544:of 0.19 and an
538:semi-major axis
515:
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496:rotation period
492:S-type asteroid
476:Nysian asteroid
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225:Semi-major axis
187:Observation arc
169:23 March 2018 (
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1553:Near-parabolic
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1499:Scattered disc
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1467:Neptune trojan
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1442:Spectral types
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1432:Jupiter trojan
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1221:Close approach
1202:
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1200:
1154:
1148:
1147:, Google books
1142:
1130:, query form (
1123:
1122:External links
1120:
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1038:
992:
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676:variable stars
664:astrophysicist
655:
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560:begins with a
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1422:Asteroid belt
1420:
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1417:Aten asteroid
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1362:Minor planets
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1245:Orbit diagram
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681:
677:
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669:
668:Gianluca Masi
665:
661:
653:
651:
649:
645:
641:
637:
633:
625:
623:
620:
615:
611:
607:
603:
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591:
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587:
586:spectral type
583:
575:
573:
571:
567:
563:
559:
556:. The body's
555:
551:
547:
543:
539:
535:
531:
527:
523:
518:
513:
505:
503:
501:
500:Gianluca Masi
497:
493:
489:
485:
484:Franco Mallia
481:
480:asteroid belt
477:
473:
465:
461:
452:
425:
422:
421:
414:
408:
405:
402:
401:Spectral type
397:
380:
377:
372:
368:
359:
356:
351:
347:0.164 km
336:
331:
328:
327:Mean diameter
323:
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316:
312:
309:
304:
300:
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292:
288:
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282:
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87:Gianluca Masi
85:
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67:
62:
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54:
51:
48:
46:
42:
39:
36:
34:
30:
25:
19:
1589:Space debris
1309:
1256:
1248:
1240:
1232:
1224:
1208:
1193:
1185:
1182:Orbital info
1177:
1169:
1160:
1108:. Retrieved
1104:
1095:
1051:Asteroids IV
1050:
1006:
1002:
995:
960:
956:
904:
900:
852:
848:
825:. Retrieved
790:. Retrieved
786:
762:. Retrieved
730:. Retrieved
726:
660:minor planet
657:
643:
629:
595:
579:
542:eccentricity
526:44 Nysa
509:
466:
459:
458:
419:
365:0.0121
339:(calculated)
259:Mean anomaly
236:Eccentricity
138:
115: 1988 UE
112:
76:(21795) Masi
64:Designations
18:
1579:Cosmic dust
1543:Long-period
1533:Halley-type
1489:Kuiper belt
1374:Designation
602:photometric
546:inclination
512:Nysa family
285:Inclination
274:Mean motion
82:Named after
1604:Categories
1584:Meteoroids
1563:Sungrazing
1538:Hyperbolic
1494:Oort cloud
1437:Near-Earth
1311:21795 Masi
1205:21795 Masi
1157:21795 Masi
1060:1502.01628
1016:1506.00762
970:1504.04041
697:References
650:of 15.42.
598:lightcurve
460:21795 Masi
333:2.45
214:Perihelion
195:(23,541 d)
173:2458200.5)
22:21795 Masi
1474:Damocloid
1237:Ephemeris
1229:Discovery
1166:Ephemeris
1009:: 34–47.
963:(3): 35.
914:1109.6407
907:(2): 25.
862:1109.4096
855:(2): 20.
614:magnitude
562:precovery
410:(assumed)
385:(assumed)
230:2.3815 AU
218:1.9222 AU
135:main-belt
38:F. Mallia
1558:Periodic
1484:Detached
1404:Asteroid
1135:Archived
554:ecliptic
201:Aphelion
1523:Extinct
1462:Centaur
1207:at the
1065:Bibcode
1021:Bibcode
975:Bibcode
937:catalog
919:Bibcode
867:Bibcode
632:NEOWISE
486:at the
474:) is a
468:1999 SN
313:81.681°
301:337.09°
289:1.8376°
205:2.8409
161:
153:
118:1993 BZ
106:1999 SN
89:
1515:Comets
1427:Family
1412:Active
1379:Groups
1257:·
1255:
1249:·
1247:
1241:·
1239:
1233:·
1231:
1225:·
1223:
1194:·
1192:
1186:·
1184:
1178:·
1176:
1170:·
1168:
1110:29 May
1083:
1003:Icarus
827:29 May
792:29 May
764:29 May
732:29 May
689:M.P.C.
654:Naming
640:albedo
494:has a
431:14.970
361:13.862
264:337.35
240:0.1929
191:64.45
139:·
113:·
111:
1572:Other
1528:Great
1259:
1251:
1243:
1235:
1227:
1196:
1188:
1180:
1172:
1055:arXiv
1011:arXiv
965:arXiv
909:arXiv
857:arXiv
691:42679
658:This
530:inner
449:15.42
442:15.41
435:0.004
393:0.037
389:0.235
343:3.150
167:Epoch
145:inner
141:
1548:Lost
1389:Moon
1384:List
1132:info
1112:2018
1081:ISBN
829:2018
794:2018
766:2018
734:2018
674:and
548:of 2
446:0.14
428:14.9
426:14.7
382:0.20
151:Nysa
1159:at
1073:doi
1029:doi
1007:261
983:doi
961:150
927:doi
905:741
875:doi
853:741
693:).
622:).
619:U=2
517:405
438:(R)
420:(H)
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1079:.
1071:.
1063:.
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1027:.
1019:.
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973:.
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887:^
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865:.
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802:^
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774:^
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704:^
534:AU
502:.
335:km
207:AU
193:yr
171:JD
1346:e
1339:t
1332:v
1291:e
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1277:v
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616:(
550:°
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433:±
407:S
391:±
367:h
363:±
345:±
266:°
181:0
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108:9
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