3I/ATLAS = C/2025 N1 (ATLAS)
MPEC 2025-N12 : 3I/ATLAS = C/2025 N1 (ATLAS)
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Read MPEC 2025-N11
Read MPEC 2025-N13
M.P.E.C. 2025-N12 Issued 2025 July 2, 21:31 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets, routine data on comets and natural satellites,
and occasional editorial announcements. They are published
on behalf of Division F of the International Astronomical Union by the
Minor Planet Center, Smithsonian Astrophysical Observatory,
Cambridge, MA 02138, U.S.A.
Prepared using the Tamkin Foundation Computer Network
MPC@CFA.HARVARD.EDU
URL https://www.minorplanetcenter.net/ ISSN 1523-6714
3I/ATLAS = C/2025 N1 (ATLAS)
A new NEOCP candidate A11pl3Z was discovered by ATLAS Chile (W68) in four
30-second survey images taken on July 1 UT. Immediate follow-up and precovery
observations by Q.-Z. Ye (I41) and S. Deen (W68, M22), including data from
June, revealed a highly eccentric, hyperbolic orbit (e ~ 6). There are
tentative reports of cometary activity from X09 (S. Deen), G37 (Q.-Z. Ye)
and T14 (R. Weryk) with a marginal coma and a short 3" tail at a position
angle 280 deg. Additional observations are strongly encouraged to better
constrain the object's orbit and nature. Any additional observations received
by the MPC will be officially published in the MPC's standard `Orbits and
Observations of Comets` publication.
In the meantime, all observations received by the MPC are available in real
time via the MPC Explorer
or in the replicated observations table available from SBN.
Observations:
0003IK25N010 C2025 06 14.25197918 37 22.105-18 45 26.11 UEN012I41
0003IK25N010 C2025 06 18.35876218 31 01.103-18 45 35.64 UEN012I41
0003IK25N010 C2025 06 18.43648118 30 53.492-18 45 36.01 UEN012I41
0003IK25N010 C2025 06 21.23221118 26 14.489-18 45 24.39 UEN012I41
0003IK25N010 C2025 06 24.38744118 20 40.188-18 44 45.46 18.09oVEN012W68
0003IK25N010 C2025 06 24.39077918 20 39.857-18 44 45.64 18.14oVEN012W68
0003IK25N010 C2025 06 24.40658618 20 38.153-18 44 45.53 18.09oVEN012W68
0003IK25N010 C2025 06 25.07392918 19 24.814-18 44 34.04 18.39cVEN012M22
0003IK25N010 C2025 06 25.07533318 19 24.734-18 44 34.73 18.37cVEN012M22
0003IK25N010 C2025 06 25.09429018 19 22.579-18 44 33.97 18.36cVEN012M22
0003IK25N010 C2025 06 27.23943818 15 20.887-18 43 48.90 17.84oVEN012W68
0003IK25N010 C2025 06 27.24394718 15 20.362-18 43 48.61 18.02oVEN012W68
0003IK25N010 C2025 06 27.33528918 15 09.863-18 43 48.92 17.99rUEN012I41
0003IK25N010 C2025 06 28.29290518 13 18.754-18 43 22.93 18.71gUEN012I41
0003IK25N010 C2025 06 28.33531318 13 13.758-18 43 22.16 UEN012I41
0003IK25N010 C2025 06 28.45014518 13 00.300-18 43 18.55 18.14cVEN012T05
0003IK25N010 C2025 06 28.45333218 12 59.873-18 43 17.98 18.38cVEN012T05
0003IK25N010 C2025 06 28.45971118 12 59.158-18 43 18.01 18.28cVEN012T05
0003IK25N010 C2025 06 29.30390018 11 19.398-18 42 52.36 18.99gUEN012I41
0003IK25N010 C2025 06 29.31508118 11 18.072-18 42 52.30 18.43rUEN012I41
0003IK25N010* C2025 07 01.21888018 07 27.677-18 41 40.16 17.72oVEN012W68
0003IK25N010 C2025 07 01.22206518 07 27.295-18 41 40.13 17.78oVEN012W68
0003IK25N010 C2025 07 01.22920318 07 26.400-18 41 39.70 17.85oVEN012W68
0003IK25N010 C2025 07 01.26424818 07 22.063-18 41 37.82 17.93oVEN012W68
0003IK25N010 KC2025 07 01.34673418 07 12.096-18 41 34.33 18.4 GWEN012474
0003IK25N010 KC2025 07 01.35541318 07 10.999-18 41 34.08 18.2 GWEN012474
0003IK25N010 KC2025 07 01.36193118 07 10.229-18 41 33.58 18.2 GWEN012474
0003IK25N010 KB2025 07 01.84234 18 06 10.74 -18 41 16.6 17.6 GXEN012M45
0003IK25N010 KB2025 07 01.84987 18 06 09.77 -18 41 16.5 18.4 GXEN012M45
0003IK25N010 KB2025 07 01.85739 18 06 08.81 -18 41 16.5 18.0 GXEN012M45
0003IK25N010 MC2025 07 01.87856118 06 06.22 -18 41 14.7 18.0 VdEN012L01
0003IK25N010 KC2025 07 01.88066418 06 05.95 -18 41 14.6 18.0 VdEN012L01
0003IK25N010 KC2025 07 01.88842418 06 05.00 -18 41 14.4 18.3 VdEN012L01
0003IK25N010 MC2025 07 01.89062218 06 04.72 -18 41 14.1 18.2 VdEN012L01
0003IK25N010 KB2025 07 01.90559 18 06 02.88 -18 41 12.9 17.5 GXEN012G02
0003IK25N010 KB2025 07 01.91470 18 06 01.75 -18 41 12.6 17.4 GXEN012G02
0003IK25N010 KB2025 07 01.92381 18 06 00.61 -18 41 11.6 17.4 GXEN012G02
0003IK25N010 KB2025 07 01.92548 18 06 00.42 -18 41 12.6 17.4 GXEN012G00
0003IK25N010 KB2025 07 01.92718118 06 00.30 -18 41 12.2 17.3 GVEN012L65
0003IK25N010 KB2025 07 01.92763 18 06 00.14 -18 41 12.9 17.2 GXEN012G00
0003IK25N010 KB2025 07 01.92979 18 05 59.90 -18 41 11.3 17.4 GXEN012G00
0003IK25N010 KB2025 07 01.93255 18 05 59.51 -18 41 12.5 17.5 GXEN012G00
0003IK25N010 KB2025 07 01.93564 18 05 59.13 -18 41 12.4 18.2 GXEN012G00
0003IK25N010 KB2025 07 01.93698518 05 58.97 -18 41 12.4 17.3 GVEN012L65
0003IK25N010 KB2025 07 01.93872 18 05 58.75 -18 41 11.8 18.1 GXEN012G00
0003IK25N010 C2025 07 01.93872 18 05 58.81 -18 41 12.0 19.3 GVEN012Z21
0003IK25N010 C2025 07 01.94084 18 05 58.54 -18 41 11.8 19.3 GVEN012Z21
0003IK25N010 C2025 07 01.94295 18 05 58.29 -18 41 11.6 19.0 GVEN012Z21
0003IK25N010 KC2025 07 01.96057818 05 56.04 -18 41 11.1 18.2 GVEN012K62
0003IK25N010 KC2025 07 01.96207118 05 55.85 -18 41 11.2 17.1 GVEN012K62
0003IK25N010 KC2025 07 01.96664818 05 55.26 -18 41 11.0 18.3 GVEN012K62
0003IK25N010 KC2025 07 01.96795418 05 55.07 -18 41 10.9 17.2 GVEN012K62
0003IK25N010 KB2025 07 01.98008318 05 53.682-18 41 08.65 18.3 VZEN012Y05
0003IK25N010 KB2025 07 01.99421318 05 51.937-18 41 08.07 18.6 VZEN012Y05
0003IK25N010 KC2025 07 01.99616718 05 51.573-18 41 10.52 17.9 VqEN012G33
0003IK25N010 KC2025 07 01.99967618 05 51.107-18 41 09.21 17.9 VqEN012G33
0003IK25N010 KC2025 07 02.00318518 05 50.657-18 41 09.09 17.8 VqEN012G33
0003IK25N010 KB2025 07 02.00804418 05 50.214-18 41 07.50 ZEN012Y05
0003IK25N010 C2025 07 02.01409518 05 49.394-18 41 08.92 18.38wVEN012R17
0003IK25N010 C2025 07 02.02254518 05 48.47 -18 41 06.5 WEN012X09
0003IK25N010 C2025 07 02.02774118 05 47.678-18 41 08.34 18.13wVEN012R17
0003IK25N010 C2025 07 02.02954318 05 47.59 -18 41 05.5 WEN012X09
0003IK25N010 C2025 07 02.04137618 05 45.970-18 41 07.73 18.36wVEN012R17
0003IK25N010 C2025 07 02.05539418 05 44.215-18 41 06.83 18.26wVEN012R17
0003IK25N010 B2025 07 02.06925 18 05 42.46 -18 41 06.3 18.7 VZEN012Y64
0003IK25N010 B2025 07 02.07105 18 05 42.25 -18 41 06.2 18.4 VZEN012Y64
0003IK25N010 B2025 07 02.07249 18 05 42.07 -18 41 06.2 18.5 VZEN012Y64
0003IK25N010 B2025 07 02.07470 18 05 41.79 -18 41 05.9 18.5 VZEN012Y64
0003IK25N010 B2025 07 02.07698 18 05 41.50 -18 41 05.9 18.5 VZEN012Y64
0003IK25N010 _C2025 07 02.14808 18 05 32.542-18 41 03.08 16.8 GVEN012G40
0003IK25N010 _C2025 07 02.15508 18 05 31.675-18 41 02.11 17.2 GVEN012G40
0003IK25N010 _C2025 07 02.16200 18 05 30.806-18 41 02.11 18.5 GVEN012G40
0003IK25N010 KC2025 07 02.16441218 05 30.719-18 41 02.61 17.1 GVEN012V11
0003IK25N010 _C2025 07 02.16894 18 05 29.930-18 41 01.36 18.0 GVEN012G40
0003IK25N010 KC2025 07 02.17229218 05 29.759-18 41 01.78 16.9 GVEN012V11
0003IK25N010 0C2025 07 02.19200 18 05 27.18 -18 40 58.6 VEN012X07
0003IK25N010 0C2025 07 02.19365 18 05 26.96 -18 40 58.4 VEN012X07
0003IK25N010 0C2025 07 02.19527 18 05 26.75 -18 40 58.3 VEN012X07
0003IK25N010 0C2025 07 02.19688 18 05 26.56 -18 40 58.4 18.2 GVEN012X07
0003IK25N010 KC2025 07 02.22286418 05 23.38 -18 40 59.7 19.2 GVEN012H21
0003IK25N010 KC2025 07 02.22570618 05 23.04 -18 40 59.7 19.3 GVEN012H21
0003IK25N010 KC2025 07 02.22854 18 05 22.58 -18 40 57.2 17.2 RqEN012I47
0003IK25N010 KC2025 07 02.22855018 05 22.68 -18 40 59.5 19.2 GVEN012H21
0003IK25N010 |C2025 07 02.25947018 05 18.710-18 40 55.50 18.3 GVEN012807
0003IK25N010 |C2025 07 02.26493018 05 18.030-18 40 55.40 18.2 GVEN012807
0003IK25N010 |C2025 07 02.27040018 05 17.340-18 40 55.10 18.4 GVEN012807
0003IK25N010 0C2025 07 02.27458 18 05 16.81 -18 40 54.8 VEN012X07
0003IK25N010 0C2025 07 02.27674 18 05 16.54 -18 40 54.6 VEN012X07
0003IK25N010 KC2025 07 02.27708 18 05 16.48 -18 40 54.8 17.4 RqEN012I47
0003IK25N010 1C2025 07 02.27860418 05 16.272-18 40 54.71 XEN012W57
0003IK25N010 0C2025 07 02.27887 18 05 16.27 -18 40 54.4 VEN012X07
0003IK25N010 0C2025 07 02.28101 18 05 15.98 -18 40 54.1 17.6 GVEN012X07
0003IK25N010 B2025 07 02.28192218 05 16.063-18 40 56.45 17.4 GWEN012T03
0003IK25N010 B2025 07 02.28253318 05 15.994-18 40 56.20 17.1 GWEN012T03
0003IK25N010 B2025 07 02.28315618 05 15.915-18 40 56.12 17.2 GWEN012T03
0003IK25N010 B2025 07 02.28504818 05 15.692-18 40 56.06 17.4 GWEN012T03
0003IK25N010 1C2025 07 02.29025618 05 14.833-18 40 53.78 XEN012W57
0003IK25N010 4C2025 07 02.30471118 05 13.007-18 40 53.51 17.76GWEN012W85
0003IK25N010 4C2025 07 02.30616418 05 12.841-18 40 53.23 18.01GWEN012W85
0003IK25N010 4C2025 07 02.30764818 05 12.650-18 40 53.23 17.99GWEN012W85
0003IK25N010 1C2025 07 02.31563718 05 11.644-18 40 53.11 17.5 GVEN012X07
0003IK25N010 1C2025 07 02.31686318 05 11.477-18 40 52.61 17.4 GVEN012X07
0003IK25N010 KC2025 07 02.32520 18 05 10.45 -18 40 52.3 17.3 RqEN012I47
0003IK25N010 3C2025 07 02.41459018 04 59.375-18 40 50.54 17.61GVEN012T14
0003IK25N010 3C2025 07 02.41579218 04 59.226-18 40 50.49 17.63GVEN012T14
0003IK25N010 3C2025 07 02.41699418 04 59.075-18 40 50.44 17.52GVEN012T14
0003IK25N010 KB2025 07 02.42731 18 04 57.90 -18 40 47.5 16.8 GVEN012Q22
0003IK25N010 KB2025 07 02.43448 18 04 56.99 -18 40 47.2 16.8 GVEN012Q22
0003IK25N010 KB2025 07 02.44122 18 04 56.13 -18 40 47.1 16.7 GVEN012Q22
0003IK25N010 9C2025 07 02.50256218 04 48.262-18 40 46.46 17.1 GWEN012F65
0003IK25N010 9C2025 07 02.50326518 04 48.168-18 40 46.38 17.1 GWEN012F65
0003IK25N010 9C2025 07 02.50625018 04 47.795-18 40 46.29 17.1 GWEN012F65
0003IK25N010 9C2025 07 02.54674618 04 42.681-18 40 44.31 17.1 GWEN012F65
0003IK25N010 9C2025 07 02.54818518 04 42.500-18 40 44.23 17.1 GWEN012F65
0003IK25N010 KC2025 07 02.68060 18 04 26.030-18 40 38.35 17.7 GXEN012N42
0003IK25N010 KC2025 07 02.68510 18 04 25.457-18 40 38.39 17.4 GXEN012N42
0003IK25N010 KC2025 07 02.68904 18 04 24.965-18 40 38.14 17.3 GXEN012N42
0003IK25N010 KC2025 07 02.85208 18 04 04.41 -18 40 30.5 17.8 VZEN012L04
0003IK25N010 KC2025 07 02.85712 18 04 03.78 -18 40 30.0 17.7 VZEN012L04
0003IK25N010 KC2025 07 02.85812 18 04 03.64 -18 40 29.9 17.5 VZEN012L04
0003IK25N010 KC2025 07 02.87161 18 04 01.96 -18 40 29.4 17.5 VZEN012L04
0003IK25N010 KC2025 07 02.87523 18 04 01.50 -18 40 29.3 17.8 VZEN012L04
Observer details:
474 Mount John Observatory, Lake Tekapo. Observers A. C. Gilmore, P. M.
Kilmartin. Measurer P. M. Kilmartin. 0.6-m f/6.3 Reflector + CCD.
807 Cerro Tololo Observatory, La Serena. Observers T. Linder, R. Holmes, L.
Hutton. 1.30-m Ritchey-Chretien + CCD.
F65 Haleakala-Faulkes Telescope North. Observers T. Santana-Ros, M. Micheli,
F. Ocana, M. Devogele, L. Conversi. Measurer M. Micheli. 2.0-m f/10
reflector + CCD.
G00 AZM Martinsberg, Oed. Observers M. Jaeger, G. Rhemann, E. Prosperi.
Measurer M. Jaeger. 0.40-m f/3.2 reflector + CMO.
G02 KYSUCE Observatory, Kysucke Nove Mesto. Observer M. Urbanik. 0.40-m
f/6.8 Corrected Dall-Kirkham + CCD.
G33 Wickede. Observer G. Neue. 0.27m Schmidt-Cassegrain + CCD.
G40 Slooh.com Canary Islands Observatory. Observer E. Cortes. 0.5-m f/6.8
Corrected Dall-Kirkham + CCD.
H21 Astronomical Research Observatory, Westfield. Observer R. Holmes.
Measurers T. Linder, R. Holmes, L. Hutton. 0.81-m f/4.0 astrograph + CCD.
I41 Palomar Mountain--ZTF. Observer Z. T. F. Collaboration. Measurer Q.-Z.
Ye. 1.2-m f/2.4 Schmidt + ZTF Camera.
I47 Pierre Auger Observatory, Malargue. Observer M. Masek. 0.3-m f/6.8
reflector + CCD.
K62 Teplice Observatory. Observer Z. Moravec. 0.60-m f/3.3 reflector + CMOS.
L01 Visnjan Observatory, Tican. Observers K. Korlevic, L. Poropat. Measurer
K. Korlevic. 1.0-m f/2.9 reflector + CCD.
L04 ROASTERR-1 Observatory, Cluj-Napoca. Observer L. Hudin. 0.30-m f/5
reflector + CCD.
L65 Bredenkamp Observatory, Bremen. Observer H. Duin. 0.23-m f/6.3 reflector
+ CMO.
M22 ATLAS South Africa, Sutherland. Observers L. Denneau, R. Siverd, J.
Tonry, H. Weiland. Measurers L. Denneau, N. Erasmus, A. Fitzsimmons, J.
Robinson, R. Siverd, J. Tonry, H. Weiland, S. Deen. 0.5-m Reflector +
CCD.
M45 Starhopper Observatory, Sfantu Gheorghe. Observer F. Ursache. 0.41-m
f/7.5 reflector + CMO.
N42 Tien-Shan Astronomical Observatory. Observer I. Reva. Measurer A.
Serebryanskiy. 1.00-m f/6.6 reflector + CCD.
Q22 SNX-NET, Moorook. Observers E. Guido, M. Rocchetto, J. Ferguson. 0.35-m
f/3.0 reflector + CMO.
R17 ATLAS-TDO. Observers M. Alarcon, L. Denneau, J. Licandro, P. Nichita, J.
Tonry. Measurers M. Alarcon, L. Denneau, N. Erasmus, A. Fitzsimmons, J.
Licandro, P. Nichita, J. Robinson, R. Siverd, J. Tonry, H. Weiland.
0.56-m f/2.2 Astrograph + CMOS.
T03 Haleakala-LCO Clamshell #3. Observers T. Santana-Ros, F. Ocana, M.
Micheli, M. Devogele, L. Conversi. Measurer M. Micheli. 0.35-m f/3
reflector + CMO.
T05 ATLAS-HKO, Haleakala. Observers L. Denneau, R. Siverd, J. Tonry, H.
Weiland. Measurers L. Denneau, N. Erasmus, A. Fitzsimmons, J. Robinson,
R. Siverd, J. Tonry, H. Weiland, S. Deen. 0.5-m Reflector + CCD.
T14 Canada-France-Hawaii Telescope, Maunakea. Observers R. Wainscoat, J.
Silva, N. Manset. Measurers R. Weryk, R. Wainscoat. 3.6-m f/4.1
reflector + CCD.
V11 Saguaro Observatory, Tucson. Observer D. Rankin. Measurers D. Rankin, D.
Parrott. 0.28-m f/2.2 reflector + CCD.
W57 ESA TBT La Silla Observatory. Observers F. Ocana, M. Micheli, R.
Kresken, L. Conversi. Measurers F. Ocana, M. Micheli. 0.56-m f/2.52
astrograph prime-focus corrector + 4K CCD.
W68 ATLAS Chile, Rio Hurtado. Observers L. Denneau, R. Siverd, J. Tonry, H.
Weiland. Measurers L. Denneau, N. Erasmus, A. Fitzsimmons, J. Robinson,
R. Siverd, J. Tonry, H. Weiland, S. Deen. 0.5-m Reflector + CCD.
W85 Cerro Tololo-LCO A. Observers T. Lister, C. Holt, J. Chatelain, E. Gomez,
S. Greenstreet. Measurer T. Lister. 1.0-m f/8.0 Ritchey-Chretien + CCD.
X07 iTelescope Deep Sky Chile, Rio Hurtado. Observers H. Sato, F. D. Romanov.
0.51-m f/6.8 astrograph + CCD, 0.51-m f/6.8 reflector + CCD.
X09 Deep Random Survey, Rio Hurtado. Observers K. Ly, S. Deen, D. Bamberger,
A. Schnabel, D. Ruhela. Measurer S. Deen. 0.43-m reflector + CMOS.
Y05 SONEAR Wykrota-CEAMIG, Serra da Piedade. Observer C. Jacques. 0.45-m
f/2.9 reflector + CMO.
Y64 Transient Survey Telescope (TST), Teide. Observers M. R. Alarcon, M.
Serra-Ricart, J. Licandro. Measurer M. R. Alarcon. 1.00-m f/1.2 RC +
CMO.
Z21 Tenerife-LCO Aqawan A #1. Observer A. Hale. 0.35-m f/3 Cassegrain + CCD.
Orbital elements:
3I/ATLAS
Epoch 2025 May 5.0 TT = JDT 2460800.5
T 2025 Oct. 29.21095 TT Veres
q 1.3745928 (2000.0) P Q
z -3.8388970 Peri. 127.79317 -0.96648407 -0.25138653
+/-0.5778437 Node 322.27219 -0.25407056 +0.90747872
e 6.2769203 Incl. 175.11669 -0.03683342 +0.33658162
From 122 observations 2025 June 14-July 2, mean residual 0".3.
M. P. C. Staff (C) Copyright 2025 MPC M.P.E.C. 2025-N12
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