Asteroids

85770 1998UP1 help

Last update: 2026-07-30 09:40 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.653

Aphelion (Q)

1.342

Eccentricity (e)

0.345

Inclination (i)

33.2

deg

Orbit period (P)

364.0

Earth MOID

0.08333

U parameter

0.8

A₂

-47.9

10^-15au/days²

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.7

mag

Diameter

200 - 400*

Taxonomic type

Scomp

Rotation period (T)

Discovery Information

Discovery Date

1998-10-18

Observatory

Lincoln Laboratory ETS, New Mexico

ORBIT VISUALISATION TOOLS

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.997676

1-sigma variation

9.270E-9

Unit

Eccentricity (e)

Value

0.345193

1-sigma variation

4.271E-7

Unit

Inclination (i)

Value

33.1770

1-sigma variation

3.295E-5

Unit

Long. of Ascending Node (Ω)

Value

18.3145

1-sigma variation

5.996E-6

Unit

Arg. of Perihelion (ω)

Value

234.2373

1-sigma variation

2.203E-5

Unit

Mean Anomaly (M)

Value

350.51889

1-sigma variation

0.00005

Unit

Perihelion distance

Value

0.653285

1-sigma variation

Unit

Aphelion distance

Value

1.342067

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.102091

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.269750

1-sigma variation

Unit

MOID

Value

0.083330

1-sigma variation

Unit

Orbit Period

Value

363.9844

1-sigma variation

Unit

U parameter

Value

0.8

1-sigma variation

Unit

A₂

Value

-47.91195

1-sigma variation

7.22974

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	8.59387E-17	-3.49717E-15	-1.60638E-13	-1.77206E-14	4.70159E-14	-8.38219E-14	3.68973E-8
e	-3.49717E-15	1.82444E-13	8.72710E-12	9.84200E-13	-2.96856E-12	-4.37527E-13	-5.58092E-7
i	-1.60638E-13	8.72710E-12	1.08549E-9	1.58835E-10	-5.52050E-10	6.55224E-10	-9.34245E-5
Ω	-1.77206E-14	9.84200E-13	1.58835E-10	3.59558E-11	-9.07523E-11	1.00258E-10	-1.38089E-5
ω	4.70159E-14	-2.96856E-12	-5.52050E-10	-9.07523E-11	4.85498E-10	-7.40492E-10	7.23048E-5
M	-8.38219E-14	-4.37527E-13	6.55224E-10	1.00258E-10	-7.40492E-10	2.08504E-9	-2.74081E-4
A₂	3.68973E-8	-5.58092E-7	-9.34245E-5	-1.38089E-5	7.23048E-5	-2.74081E-4	5.22691E1

Date of computation: 2026-07-30 09:40 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Scomp

Unit

Source

[1]

Taxonomy (all)

Value

Scomp

Unit

Source

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.67

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

200 - 400*

Unit

Source

[3]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

12791

Unit

Source

[1]

Unobserved

Value

353

Unit

Source

[1]

Normalized RMS of residuals

Value

0.563357

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1990-10-12.28681

Unit

Source

[2]

Last Observation

Value

2025-10-19.451557

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

512 (9)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net

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Final Date: *

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Max residual (arcsec):

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Computation parameters

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Final Date: *

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Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 85770 1998UP1 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1965-10-07 00:18	< 1 min	0.1908408	0.1908292	0.0000039
EARTH	1966-10-07 03:58	< 1 min	0.1803390	0.1803279	0.0000037
EARTH	1967-10-07 07:30	< 1 min	0.1704852	0.1704746	0.0000035
EARTH	1968-10-06 11:40	< 1 min	0.1607740	0.1607641	0.0000033
EARTH	1969-10-06 17:05	< 1 min	0.1515797	0.1515705	0.0000031
EARTH	1970-10-06 22:10	< 1 s	0.1432309	0.1432224	0.0000028
EARTH	1971-10-07 04:09	< 1 s	0.1358537	0.1358460	0.0000026
EARTH	1972-10-06 10:27	< 1 s	0.1290213	0.1290143	0.0000023
EARTH	1973-10-06 16:19	< 1 s	0.1228747	0.1228685	0.0000021
EARTH	1974-10-06 23:04	< 1 s	0.1174206	0.1174152	0.0000018
EARTH	1975-10-07 05:31	< 1 min	0.1128242	0.1128194	0.0000016
EARTH	1976-10-06 12:05	< 1 min	0.1086835	0.1086794	0.0000014
EARTH	1977-10-06 19:10	< 1 min	0.1048449	0.1048413	0.0000012
EARTH	1978-10-07 01:42	< 1 min	0.1016325	0.1016295	0.0000010
EARTH	1979-10-07 08:30	< 1 min	0.0993209	0.0993183	0.0000009
EARTH	1980-10-06 15:20	< 1 min	0.0974004	0.0973982	0.0000007
EARTH	1981-10-06 21:43	< 1 min	0.0958874	0.0958855	0.0000006
EARTH	1982-10-07 04:34	< 1 min	0.0946062	0.0946046	0.0000005
EARTH	1983-10-07 11:02	< 1 s	0.0935901	0.0935888	0.0000004
EARTH	1984-10-06 17:24	< 1 s	0.0926726	0.0926715	0.0000004
EARTH	1985-10-07 00:02	< 1 s	0.0918333	0.0918324	0.0000003
EARTH	1986-10-07 06:13	< 1 s	0.0913006	0.0912998	0.0000003
EARTH	1987-10-07 12:21	< 1 s	0.0913138	0.0913130	0.0000002
EARTH	1988-10-06 18:36	< 1 s	0.0913397	0.0913390	0.0000002
EARTH	1989-10-07 00:17	< 1 s	0.0914576	0.0914569	0.0000002
EARTH	1990-10-07 06:15	< 1 s	0.0917271	0.0917265	0.0000002
EARTH	1991-10-07 12:00	< 1 s	0.0922953	0.0922948	0.0000002
EARTH	1992-10-06 17:31	< 1 s	0.0930007	0.0930002	0.0000002
EARTH	1993-10-06 23:28	< 1 s	0.0938141	0.0938136	0.0000002
EARTH	1994-10-07 05:08	< 1 s	0.0948491	0.0948486	0.0000002
EARTH	1995-10-07 10:34	< 1 s	0.0965149	0.0965144	0.0000002
EARTH	1996-10-06 16:17	< 1 s	0.0984293	0.0984288	0.0000002
EARTH	1997-10-06 21:24	< 1 s	0.1007495	0.1007491	0.0000002
EARTH	1998-10-07 02:44	< 1 s	0.1036362	0.1036357	0.0000002
EARTH	1999-10-07 08:16	< 1 s	0.1071881	0.1071876	0.0000002
EARTH	2000-10-06 13:23	< 1 s	0.1110505	0.1110500	0.0000002
EARTH	2001-10-06 19:02	< 1 s	0.1153171	0.1153166	0.0000002
EARTH	2002-10-07 00:42	< 1 s	0.1202891	0.1202885	0.0000002
EARTH	2003-10-07 06:07	< 1 s	0.1264630	0.1264625	0.0000002
EARTH	2004-10-06 12:30	< 1 s	0.1334133	0.1334127	0.0000002
EARTH	2005-10-06 18:43	< 1 s	0.1410384	0.1410378	0.0000002
EARTH	2006-10-07 01:13	< 1 s	0.1493885	0.1493879	0.0000002
EARTH	2007-10-07 08:51	< 1 s	0.1584393	0.1584386	0.0000002
EARTH	2008-10-06 16:01	< 1 s	0.1677305	0.1677299	0.0000002
EARTH	2009-10-07 00:09	< 1 s	0.1775546	0.1775539	0.0000002
EARTH	2010-10-07 09:29	< 1 s	0.1881555	0.1881548	0.0000002
EARTH	2011-10-07 18:39	< 1 s	0.1997423	0.1997415	0.0000003
VENUS	2044-04-25 19:04	< 1 min	0.0246972	0.0246951	0.0000007
VENUS	2094-02-22 18:42	< 1 min	0.0279228	0.0278995	0.0000078
VENUS	2115-01-24 19:13	1.9	0.0256288	0.0255958	0.0000111

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
101.72879056	270.67459213	0.08333017	MINIMUM
310.45134297	81.97252614	0.24757175	MINIMUM
22.58129982	179.32452243	0.58132617	SADDLE
210.03069812	346.86396542	0.69598718	SADDLE
12.20366804	341.78639351	1.58678346	SADDLE
169.92655276	136.56582760	2.29992262	MAXIMUM

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