Asteroids

2025HQ4 help

Last update: 2026-04-19 12:46 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.225

Aphelion (Q)

1.048

Eccentricity (e)

0.647

Inclination (i)

2.6

deg

Orbit period (P)

185.4

Earth MOID

0.00712

U parameter

1.1

Next Earth close approach

Date

2026-04-21

Nominal distance (from Earth center)

0.04189

6266767

Maximum Brightness

20.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

16 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-04-26

Observatory

Mt. Lemmon Survey

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

0.636249

1-sigma variation

3.562E-9

Unit

Eccentricity (e)

Value

0.646873

1-sigma variation

1.993E-7

Unit

Inclination (i)

Value

2.6315

1-sigma variation

1.644E-5

Unit

Long. of Ascending Node (Ω)

Value

47.9830

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

338.8987

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

287.42125

1-sigma variation

0.00007

Unit

Perihelion distance

Value

0.224677

1-sigma variation

Unit

Aphelion distance

Value

1.047822

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.760072

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.075222

1-sigma variation

Unit

MOID

Value

0.007122

1-sigma variation

Unit

Orbit Period

Value

185.3699

1-sigma variation

Unit

U parameter

Value

1.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.26856E-17	-1.31841E-16	-1.08668E-14	4.10967E-14	-3.40183E-14	-5.83989E-14
e	-1.31841E-16	3.97290E-14	2.61190E-12	-9.60485E-12	6.49734E-12	1.40057E-11
i	-1.08668E-14	2.61190E-12	2.70169E-10	-1.05371E-9	8.48082E-10	9.29355E-10
Ω	4.10967E-14	-9.60485E-12	-1.05371E-9	4.19210E-9	-3.42847E-9	-3.44530E-9
ω	-3.40183E-14	6.49734E-12	8.48082E-10	-3.42847E-9	2.91034E-9	2.34772E-9
M	-5.83989E-14	1.40057E-11	9.29355E-10	-3.44530E-9	2.34772E-9	4.96699E-9

Date of computation: 2026-04-19 12:46 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

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

26.04

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

16 - 40*

Unit

Source

[2]

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]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

358

Unit

Source

[1]

Unobserved

Value

0.5

Unit

Source

[1]

Normalized RMS of residuals

Value

0.69826

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-04-26.447115

Unit

Source

[2]

Last Observation

Value

2026-04-19.34765

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

160 (1)

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

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

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 2025HQ4 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
MERCURY	1951-06-24 23:50	< 1 min	0.0368921	0.0368773	0.0000049
EARTH	1952-04-30 10:18	< 1 min	0.1994193	0.1994133	0.0000020
EARTH	1953-05-02 02:26	< 1 min	0.1312500	0.1312447	0.0000018
EARTH	1954-05-02 11:16	< 1 min	0.0680293	0.0680249	0.0000015
EARTH	1955-04-30 16:09	< 1 min	0.0157629	0.0157602	0.0000009
MERCURY	1955-06-22 07:18	< 1 min	0.0349968	0.0349918	0.0000016
EARTH	1956-04-25 10:01	< 1 min	0.0255862	0.0255847	0.0000005
VENUS	1956-06-07 12:34	< 1 min	0.0190757	0.0190731	0.0000009
EARTH	1957-04-18 17:19	< 1 min	0.0450615	0.0450612	0.0000001
VENUS	1958-02-20 12:42	< 1 min	0.0163869	0.0163846	0.0000008
EARTH	1958-04-11 07:55	< 1 min	0.0430993	0.0430983	0.0000003
EARTH	1959-04-05 01:48	< 1 min	0.0261337	0.0261329	0.0000003
EARTH	1960-03-31 16:10	< 1 min	0.0477467	0.0477441	0.0000009
EARTH	1961-03-31 01:02	< 1 min	0.1049896	0.1049859	0.0000012
EARTH	1962-04-01 06:00	< 1 min	0.1723058	0.1723015	0.0000014
VENUS	1965-01-17 20:03	< 1 min	0.0489302	0.0489252	0.0000017
MERCURY	1965-02-06 19:57	< 1 min	0.0288450	0.0288439	0.0000004
MERCURY	1970-09-30 17:43	< 1 min	0.0334199	0.0334110	0.0000030
MERCURY	1979-04-24 01:52	< 1 min	0.0381081	0.0381056	0.0000008
VENUS	1985-05-07 08:54	< 1 min	0.0169062	0.0169058	0.0000001
VENUS	1987-01-20 13:44	< 1 s	0.0206243	0.0206234	0.0000003
EARTH	1988-05-01 21:33	< 1 s	0.1450732	0.1450717	0.0000005
MERCURY	1988-12-13 00:41	< 1 min	0.0342558	0.0342551	0.0000002
EARTH	1989-05-02 13:57	< 1 min	0.0766520	0.0766504	0.0000005
EARTH	1990-04-30 23:11	< 1 min	0.0189198	0.0189184	0.0000005
EARTH	1991-04-26 12:39	< 1 min	0.0253035	0.0253024	0.0000004
EARTH	1992-04-18 11:14	< 1 min	0.0456652	0.0456646	0.0000002
EARTH	1993-04-10 17:38	< 1 min	0.0421721	0.0421719	0.0000001
EARTH	1994-04-04 12:33	< 1 min	0.0254620	0.0254616	0.0000001
MERCURY	1994-08-03 20:28	< 1 min	0.0455893	0.0455877	0.0000005
EARTH	1995-04-01 08:18	< 1 min	0.0541857	0.0541849	0.0000003
EARTH	1996-03-31 00:54	< 1 min	0.1158297	0.1158287	0.0000003
EARTH	1997-04-01 13:28	< 1 s	0.1872968	0.1872958	0.0000003
MERCURY	1998-08-02 21:07	< 1 min	0.0463708	0.0463689	0.0000006
MERCURY	2003-02-25 12:20	< 1 min	0.0463551	0.0463529	0.0000007
MERCURY	2004-03-26 01:34	< 1 min	0.0480212	0.0480186	0.0000009
VENUS	2007-05-09 19:30	< 1 s	0.0434353	0.0434337	0.0000005
MERCURY	2012-10-17 01:41	< 1 min	0.0345300	0.0345288	0.0000004
VENUS	2014-04-06 16:19	< 1 min	0.0311909	0.0311895	0.0000005
VENUS	2015-12-21 02:56	< 1 min	0.0442652	0.0442632	0.0000007
MERCURY	2018-06-10 14:18	< 1 min	0.0297292	0.0297263	0.0000010
EARTH	2022-05-01 22:53	< 1 min	0.1760644	0.1760640	0.0000001
EARTH	2023-05-03 07:00	< 1 min	0.1046168	0.1046165	0.0000001
EARTH	2024-05-01 18:29	< 1 s	0.0407812	0.0407810	0.0000000
EARTH	2025-04-28 10:05	< 1 s	0.0123525	0.0123525	0.0000000
EARTH	2026-04-21 15:29	< 1 min	0.0418908	0.0418905	0.0000001
MERCURY	2027-01-01 20:25	< 1 min	0.0302735	0.0302726	0.0000003
EARTH	2027-04-13 07:08	< 1 min	0.0455706	0.0455700	0.0000002
EARTH	2028-04-05 03:43	< 1 min	0.0279945	0.0279938	0.0000002
EARTH	2029-04-01 06:33	< 1 s	0.0468934	0.0468925	0.0000003
EARTH	2030-03-31 14:20	< 1 min	0.1086706	0.1086692	0.0000005
EARTH	2031-04-02 01:06	< 1 min	0.1819826	0.1819810	0.0000005
MERCURY	2032-08-25 14:18	< 1 min	0.0255703	0.0255670	0.0000011
VENUS	2034-07-25 17:59	< 1 min	0.0295736	0.0295725	0.0000004
MERCURY	2037-03-21 07:04	< 1 min	0.0457345	0.0457303	0.0000014
VENUS	2046-04-02 15:16	< 1 min	0.0187099	0.0187094	0.0000001
VENUS	2047-12-17 01:41	< 1 min	0.0279368	0.0279342	0.0000008
MERCURY	2050-05-14 14:07	< 1 min	0.0370759	0.0370729	0.0000010
MERCURY	2054-12-09 13:40	< 1 min	0.0269278	0.0269272	0.0000002
EARTH	2055-05-03 07:17	< 1 s	0.1260507	0.1260465	0.0000014
EARTH	2056-05-02 08:28	< 1 min	0.0543335	0.0543296	0.0000013
EARTH	2057-04-29 08:13	< 1 min	0.0075648	0.0075632	0.0000005
VENUS	2057-12-09 11:14	< 1 min	0.0319430	0.0319373	0.0000019
EARTH	2058-04-22 07:44	< 1 min	0.0410613	0.0410594	0.0000006
EARTH	2059-04-13 08:47	< 1 min	0.0459453	0.0459445	0.0000003
MERCURY	2059-07-06 07:07	< 1 min	0.0454847	0.0454750	0.0000032
VENUS	2059-08-24 21:32	< 1 min	0.0120604	0.0120576	0.0000009
EARTH	2060-04-04 16:49	< 1 min	0.0276709	0.0276692	0.0000005
EARTH	2061-03-31 23:01	< 1 min	0.0585369	0.0585263	0.0000035
EARTH	2062-03-31 21:43	< 1 min	0.1310441	0.1310259	0.0000061
VENUS	2069-08-18 08:33	< 1 min	0.0195877	0.0195869	0.0000003
VENUS	2071-05-04 01:07	1.1	0.0434146	0.0433164	0.0000327
MERCURY	2073-03-28 20:53	3.4	0.0406985	0.0405746	0.0000413
MERCURY	2077-10-25 22:07	5.2	0.0310185	0.0308873	0.0000440
MERCURY	2082-05-24 22:49	6.9	0.0260744	0.0260256	0.0000168
EARTH	2085-05-02 23:21	1.1	0.1288778	0.1286903	0.0000625
EARTH	2086-05-02 23:57	2.0	0.0524549	0.0522903	0.0000549
MERCURY	2086-12-21 16:58	7.6	0.0258604	0.0258246	0.0000126
EARTH	2087-04-29 14:22	6.6	0.0100364	0.0099458	0.0000303
EARTH	2088-04-20 17:06	9.0	0.0441868	0.0441551	0.0000105
EARTH	2089-04-11 01:39	7.2	0.0436005	0.0435681	0.0000108
EARTH	2090-04-03 18:09	3.0	0.0280038	0.0279980	0.0000020
EARTH	2091-04-01 02:03	< 1 min	0.0808149	0.0807511	0.0000213
MERCURY	2091-07-20 18:22	3.3	0.0286119	0.0285347	0.0000258
EARTH	2092-04-01 00:10	< 1 min	0.1628388	0.1627866	0.0000174
VENUS	2096-01-31 04:22	< 1 min	0.0257446	0.0257250	0.0000066
VENUS	2097-10-15 22:40	1.2	0.0370041	0.0368965	0.0000359
MERCURY	2105-11-13 22:27	9.4	0.0199142	0.0195856	0.0001117
VENUS	2110-11-06 14:01	5.2	0.0396945	0.0393215	0.0001246
VENUS	2112-07-22 08:28	4.8	0.0195619	0.0191779	0.0001286
EARTH	2113-05-03 06:01	3.1	0.1776596	0.1773474	0.0001041
MERCURY	2113-12-13 04:21	11.6	0.0247717	0.0247629	0.0000045
EARTH	2114-05-04 16:13	< 1 min	0.0907441	0.0904867	0.0000858
EARTH	2115-05-02 22:48	6.2	0.0167815	0.0166106	0.0000570
EARTH	2116-04-25 21:46	9.1	0.0329308	0.0328680	0.0000209
EARTH	2117-04-16 15:32	6.4	0.0482209	0.0482084	0.0000042
EARTH	2118-04-07 21:28	1.3	0.0315294	0.0315184	0.0000037
MERCURY	2118-07-12 11:45	< 1 min	0.0302447	0.0302339	0.0000036
EARTH	2119-04-03 03:42	1.0	0.0492246	0.0492128	0.0000039
EARTH	2120-04-01 15:24	< 1 min	0.1219800	0.1218870	0.0000310
MERCURY	2123-02-09 09:02	16.1	0.0482243	0.0477725	0.0001508

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
206.03356188	113.83511660	0.00712239	MINIMUM
152.72877763	88.73358261	0.02569722	MINIMUM
177.82942315	100.59516373	0.04767891	SADDLE
354.95538177	275.83364305	0.77276734	SADDLE
354.97070296	95.88063889	1.22734384	SADDLE
178.97325363	281.13201012	2.04438182	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out