25000 Astrometria

Main-belt asteroid

25000 AstrometriaDiscovery[1]

Discovered by| P. G. Comba
Discovery site| Prescott Obs.
Discovery date| 28 July 1998
Designations

MPC designation

| (25000) Astrometria

Named after

| astrometry[2]
(branch of astronomy)

Alternative designations

| 1998 OW5

Minor planet category

| main-belt * (outer)
background[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 35.25 yr (12,875 d)
Aphelion| 3.4706 AU
Perihelion| 2.8558 AU

Semi-major axis

| 3.1632 AU
Eccentricity| 0.0972

Orbital period (sidereal)

| 5.63 yr (2,055 days)

Mean anomaly

| 307.37°

Mean motion

| 0° 10m 30.72s / day
Inclination| 14.935°

Longitude of ascending node

| 142.05°

Argument of perihelion

| 13.193°
Physical characteristics

Mean diameter

| 17.483±0.213 km[4]
22.77±1.8 km[5]

Geometric albedo

| 0.0311±0.006[5]
0.053±0.007[4]

Absolute magnitude (H)

| 12.6[5] * 12.7[1]

25000 Astrometria (provisional designation 1998 OW5) is a dark background asteroid from the outer regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 28 July 1998, by American astronomer Paul Comba at his Prescott Observatory in Arizona, United States. The asteroid was named in honor of the astronomical branch astrometry.[2]

## Orbit and classification

[edit]

Astrometria is a non-family from the main belt's background population.[3] It orbits the Sun in the outer asteroid belt at a distance of 2.9–3.5 AU once every 5 years and 8 months (2,055 days; semi-major axis of 3.16 AU). Its orbit has an eccentricity of 0.10 and an inclination of 15° with respect to the ecliptic.[1]

Published by the Digitized Sky Survey, the asteroid was first observed at the Siding Spring Observatory, Australia, in August 1982. The body's observation arc begins with its official discovery observation at Prescott Observatory.[2]

## Physical characteristics

[edit]

Astrometria is likely a carbonaceous C-type asteroid or potentially an even darker D-type or primitive P-type asteroid based on its low albedo (see below).

### Rotation period

[edit]

As of 2018, no rotational lightcurve of Astrometria has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[1][6]

### Diameter and albedo

[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Astrometria measures 17.483 and 22.77 kilometers in diameter and its surface has a low albedo of 0.053 and 0.0311, respectively.[4][5]

## Naming

[edit]

This minor planet was named after the astronomical branch astrometry, that precisely measures the positions and movements of astronomical objects including small Solar System bodies.[2] The official naming citation was published by the Minor Planet Center on 4 August 2001 (M.P.C. 43195).[7]

## References

[edit]

1. ^ a b c d e "JPL Small-Body Database Browser: 25000 Astrometria (1998 OW5)" (2017-11-26 last obs.). Jet Propulsion Laboratory. Retrieved 31 January 2018.
2. ^ a b c d "25000 Astrometria (1998 OW5)". Minor Planet Center. Retrieved 31 January 2018.
3. ^ a b "Asteroid 25000 Astrometria – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
4. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 31 January 2018.
5. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
6. ^ "LCDB Data for (25000) Astrometria". Asteroid Lightcurve Database (LCDB). Retrieved 31 January 2018.
7. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 31 January 2018.

## External links

[edit]

* 25000 Astrometria at AstDyS-2
* Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
* Dictionary of Minor Planet Names, Google books
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* Discovery Circumstances: Numbered Minor Planets (25001)-(30000) – Minor Planet Center
* 25000 Astrometria at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 25000 Astrometria at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit viewer * Orbit parameters * Physical parameters

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