Population Analysis

class multineas.population.Asteroid

Bases: object

Class to manipulate asteroid properties.

C_std = 1329

a_std = 0.15

static diameter_to_hmag(diameter, albedo=0.15)

Convert diameter to absolute magnitude.

Parameters:

• diameter (float or array) – Diameter in km.

• albedo (float, optional) – Albedo (default 0.15).

Returns:

H – Absolute magnitude.

Return type:

float or array

Notes

The formula used for conversion is:

$$ D = frac{C}{sqrt{p_v}} 10^{-H/5} $$

where $D$ is diameter in km, $p_v$ is albedo, and $H$ is absolute magnitude. The constant $C = 1329$ km.

We can invert this to get $H$:

$$ H = -5 log_{10} left( frac{D sqrt{p_v}}{C} right) $$

Examples

>>> D = 1.0
>>> Asteroid.diameter_to_hmag(D)
17.7...

Attr. [HC]

static hmag_to_diameter(H, albedo=0.15)

Convert absolute magnitude to diameter.

Parameters:

• H (float or array) – Absolute magnitude.

• albedo (float, optional) – Albedo (default 0.15).

Returns:

diameter – Diameter in km.

Return type:

float or array

Notes

The formula used for conversion is:

$$ D = frac{C}{sqrt{p_v}} 10^{-H/5} $$

where $D$ is diameter in km, $p_v$ is albedo, and $H$ is absolute magnitude. The constant $C = 1329$ km.

Examples

>>> H = 18.0
>>> Asteroid.hmag_to_diameter(H)
0.89...

Attr. [HC]