Asteroids

2021PH27

Last update: 2023-03-21 02:34 UTC

Orbital Properties

Epoch

60000.0

MJD

Orbit type

Atira

Perihelion (q)

0.133

Aphelion (Q)

0.790

Eccentricity (e)

0.712

Inclination (i)

31.9

deg

Orbit period (P)

114.6

Earth MOID

0.22542

U parameter

3.2

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

17.7

mag

Diameter

1000*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-08-13

Observatory

Cerro Tololo Observatory, La Serena

Orbit Visualiser

Click the button to start Orbit Visualiser

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

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

Value

1-sigma variation

Unit

Epoch

Value

60000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.461668

1-sigma variation

6.029E-8

Unit

Eccentricity (e)

Value

0.711710

1-sigma variation

0.000002

Unit

Inclination (i)

Value

31.9432

1-sigma variation

0.0002

Unit

Ascending Node (Ω)

Value

39.4003

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

8.5615

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

147.10897

1-sigma variation

0.00027

Unit

Perihelion

Value

0.133094

1-sigma variation

Unit

Aphelion

Value

0.790241

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.859643

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.238025

1-sigma variation

Unit

MOID

Value

0.225419

1-sigma variation

Unit

Orbit Period

Value

114.5757

1-sigma variation

Unit

U parameter

Value

3.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.63472E-15	-2.32267E-14	-5.17984E-12	-1.29708E-12	-1.03940E-12	-1.06505E-11
e	-2.32267E-14	2.93697E-12	2.81157E-10	-5.55548E-12	2.13541E-11	-2.40699E-10
i	-5.17984E-12	2.81157E-10	4.13177E-8	2.99857E-9	2.70254E-9	-1.19529E-8
Ω	-1.29708E-12	-5.55548E-12	2.99857E-9	6.16928E-9	-1.74969E-9	5.03353E-9
ω	-1.03940E-12	2.13541E-11	2.70254E-9	-1.74969E-9	2.97569E-9	-7.37620E-10
M	-1.06505E-11	-2.40699E-10	-1.19529E-8	5.03353E-9	-7.37620E-10	7.18416E-8

Date of computation: 2022-11-23 04:56 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

17.729

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

Unit

Source

[-]

Diameter

Value

1000*

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

[-]

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Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved

Arc Information

Value

Unit

Source

Arc Length

Value

1709

Unit

Source

[1]

Unobserved

Value

364

Unit

Source

[1]

Astrometry Summary

RMS of Residuals
First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

RMS of Residuals

Value

0.492153

Unit

arcsec

Source

[1]

First Observation

Value

2017-07-16.97176

Unit

Source

[2]

Last Observation

Value

2022-03-21.791698

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

59 (0)

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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

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

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Close approaches for 2021PH27 from 1950 to 2123

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
VENUS	1960-01-26 13:26	3.1	0.0375360	0.0373811	0.0000517
VENUS	1960-09-06 02:25	< 1 min	0.0244754	0.0243185	0.0000524
VENUS	1976-01-23 20:29	< 1 min	0.0152937	0.0152899	0.0000013
VENUS	1991-06-11 19:26	1.1	0.0253134	0.0252502	0.0000211
VENUS	1992-01-21 18:10	< 1 min	0.0385709	0.0384866	0.0000281
VENUS	2006-10-29 03:02	< 1 min	0.0451419	0.0451123	0.0000099
VENUS	2007-06-09 10:23	< 1 min	0.0173833	0.0173646	0.0000062
VENUS	2022-10-26 04:45	< 1 min	0.0161826	0.0161808	0.0000006
VENUS	2038-03-14 07:52	< 1 min	0.0329488	0.0329150	0.0000113
VENUS	2038-10-24 00:41	< 1 min	0.0286819	0.0286421	0.0000133
VENUS	2054-03-11 18:15	< 1 min	0.0144859	0.0144775	0.0000028
VENUS	2069-07-28 14:34	1.7	0.0206570	0.0205585	0.0000329
VENUS	2070-03-09 17:31	< 1 min	0.0443115	0.0441590	0.0000508
VENUS	2084-12-14 21:40	2.9	0.0415687	0.0414352	0.0000445
VENUS	2085-07-26 08:13	< 1 min	0.0194113	0.0192923	0.0000398
VENUS	2100-12-13 01:52	1.1	0.0141249	0.0140971	0.0000095
VENUS	2116-05-01 02:13	3.9	0.0278737	0.0276423	0.0000773
VENUS	2116-12-10 23:11	< 1 min	0.0341403	0.0338506	0.0000967

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