When the initial periodic comet list was compiled, a number of errors were made in assigning the order of the serial numbers in the PDS Names. In 2005, a search of the IAUCs, MPECs and CBETs was done to determine the true order in which the comets were designated as periodic. On January 13, 2006, the names in the list were corrected to reflect this order. This file gives a list of the changes that were made on that date. Any subsequent changes are also indicated at the end of the file, with a description of the change and why it was made. Changes Made January 13, 2006: Official Initial New PDS Name Designation PDS Name (Corrected on Jan 13 2006) P/1999 J5 LINEAR 5 LINEAR 4 P/1999 G1 LINEAR 4 LINEAR 5 P/1999 XS87 LINEAR 9 LINEAR 8 P/2000 B3 LINEAR 10 LINEAR 9 165P/2000 B4 LINEAR 11 LINEAR 10 P/1999 XB69 LINEAR 8 LINEAR 11 P/2000 G1 LINEAR 13 LINEAR 12 P/2000 G2 LINEAR 14 LINEAR 13 P/2000 D2 LINEAR 12 LINEAR 14 P/2002 A1 LINEAR 19 LINEAR 18 P/2002 A2 LINEAR 20 LINEAR 19 P/2002 B1 LINEAR 22 LINEAR 20 P/2001 YX127 LINEAR 18 LINEAR 21 P/2002 CW134 LINEAR 23 LINEAR 22 P/2002 AR2 LINEAR 21 LINEAR 23 P/2001 R1 LONEOS 5 LONEOS 4 P/2001 OG108 LONEOS 4 LONEOS 5 P/2001 K1 NEAT 4 NEAT 3 P/2001 J1 NEAT 3 NEAT 4 Additional changes: April 13, 2006: The comet originally named "P/2005 N2 Hergenrother 3" was actually a re-discovery of the comet "P/1998 W2 Hergenrother 1". The MPC subsequently assigned the official designation "168P/2005 N2" and the PDS kept the original name "Hergenrother 1". The name "Hergenrother 3" was withdrawn. Sept 11, 2009: The comet designated P/2003 A1 (IAUC 8044, 8053) remained unnamed for nearly 2 years. It was finally given the name LINEAR 44 in Nov 2004 (IAUC 8430). On Sept 11 2009, Kowalski independently discovered a comet that was subsequently linked to LINEAR 44 and then to Pigott 1. With these connections, the comet was renamed Pigott-LINEAR-Kowalski 1 (IAUC 9072), and the names Pigott 1 and LINEAR 44 were withdrawn. May 8 2013: During the compilation of the list, a number of provisional designations were incorrectly included as the official designation (those included were correct for the comet, but were from a different apparition). These have been corrected to match those adopted by the MPC. Comet name Previous desig. Changed to ---------------------------- --------------- --------------- 156P/Russell-LINEAR 1 P/1986 R1 P/2000 QD181 168P/Hergenrother 1 P/2005 N2 P/1998 W2 226P/Pigott-LINEAR-Kowalski 1 P/2009 R2 P/2003 A1 234P/LINEAR 60 P/2010 E4 P/2002 CF140 235P/LINEAR 61 P/2010 F2 P/2002 FA9 237P/LINEAR 62 P/2010 L2 P/2002 LN13 247P/LINEAR 63 P/2010 V3 P/2002 VP94 P/Christensen 13 P/2007 A2 P/2006 WY182 P/SOHO 1 P/2007 R5 P/1999 R1 P/SOHO 2 P/2008 K10 P/1999 X3 P/SOHO 3 P/2008 S2 P/1997 J6 P/SOHO 4 P/2008 N4 P/1996 X3 P/SOHO 5 P/2010 H3 P/1999 J6 P/SOHO 6 P/2011 E1 P/2000 O3 P/Wise 9 P/2011 JC81 P/2010 JC81 (typo corrected) May 22, 2013: During the course of numbering some recent comets, it was found that on two occasions, early observations of a comet had shown it to have a periodic orbit, only to have subsequent observations lead to a solution that was not periodic. C/2013 F3 McNaught 28 Designated periodic 2013 Apr 9 (2013-G31) Listed as non-periodic 2013 Apr 23 (2013-H38) Because this object is fairly obscure (to the point of little additional photometry) it was felt that removing it from the list and allowing the serial number to be reassigned would not cause any significant problems. So C/2013 F3 McNaught 28 was removed from the list and the serial number 28 was opened up for the next periodic McNaught comet. C/2013 G3 PanSTARRS 16 Designated periodic 2013 Apr 14 (CBET 3472) Listed as non-periodic 2013 Apr 23 (2013-H38) This comet has the additional complexity that a PanSTARRS 17 was discovered before 16 was found to be non-periodic. However, because both of these objects are fairly obscure (again, little additional photometry has been submitted for either) it was felt that removing 16 from the list and renumbering 17 to 16 would not cause any significant problems. So C/2013 G3 PanSTARRS 16 was removed from the list and P/2013 G4 PanSTARRS 17 Was renumbered to PanSTARRS 16. The serial number 17 was opened up for the next periodic PanSTARRS comet. July 29, 2014: In conjunction with other lists, errors in were discovered and corrected P/2013 TL117 Lemmon 8 was changed to Lemmon 7. Accidently skipped 7, so there is no conflict in the change. C/2011 P2 PanSTARRS 23 is the same comet as PanSTARRS 2, so this was a duplicate name for the same comet. Unfortunately, the change propagates through the next five PanSTARRS comets. A literature and web search was done to determine if changing the serial numbers would raise any confusion. Only one object P/2013 P5 had any significant attention, as it is a main belt comet. None of the references that were found referred to its serial number, however, so a change should not raise any confusion. The rest of the objects are fairly obscure, so renumbering shouldn't be a problem. Changes: C/2011 P2 PanSTARRS 23 --> Removed P/2013 P5 PanSTARRS 24 --> PanSTARRS 23 C/2013 P4 PanSTARRS 25 --> PanSTARRS 24 P/2013 T1 PanSTARRS 26 --> PanSTARRS 25 P/2013 W1 PanSTARRS 27 --> PanSTARRS 26 C/2013 W2 PanSTARRS 28 --> PanSTARRS 27 These changes were made before updating the list for new comets that were discovered between Jan and Jul 2014, so additions in that interval account for these changes. Oct 25, 2016: Renaming of comet P/2015 PD229 On Feb 1, 2016, this comet was originally named ISON-Cameron. In the OCT 25, 2016 MPEC-2016-U66 and all subsequent references, it is called Cameron-ISON. No explanation is given for this. The name ISON-Cameron 1 has been withdrawn. Mar 14, 2017 C/2016 VZ18 was briefly given the name PanSTARRS 63, before it was realized it was long period. It has been removed from the list, and because it was changed before any subsequent PanSTARRS comets were numbered, the sequence is not affected. Aug 17, 2017 P/2016 P2 was given the name PanSTARRS 58 (MPEC 2016-P120). In May 2017, its orbit was matched with that of 2007 R11 and to 1998 U8, and it was renamed Wiegert-PanSTARRS 1 (MPEC 2017-K62). Since several PanSTARRS comets were given names in the intervening time, PanSTARRS 58 has been withdrawn and will not be reassigned. Jul 24, 2018 Noticed that Horizens does not link P/2002 S7 and P/2008 N4 (SOHO 4) with C/1996 X3 as the MPC does (2009-J14). So changed the designation of SOHO 4 in the list from P/1996 X3 to P/2002 S7. No changes to the name order. June 8, 2020 According to CBET 4792, COMET P/2013 J4 (PANSTARRS) = P/2019 Y2 (FULS). Because the arc from 2013 was short, this is considered to be a weak orbit solution, so the 2019 solution is better. The MPC has not indicated that the names will be merged, or if either object name will be withdrawn, so we are currently maintaining both, with a note to such effect. *** Update: Nov 11 2020, MPEC-V69 confirmed these are the same object and merged the names. So P/2013 J4 was renamed PANSTARRS-Fuls 1. The name PANSTARRS 17 has been withdrawn and will not be reassigned. The name Fuls 2 was withdrawn. Aug 15 2020 According to CBET 5117, P/2022 E1 was renamed from Christiansen (18) to PanSTARRS-Christensen (1). Since no Christiansen comets were found in the interim, the Christiansen 18 designation is withdrawn and will be reassigned.