C/2002 A2 (LINEAR)
| Parameter |
Value |
| Designation |
C/2002 A2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-12-05T15:58:53.768640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:12Z |
| Obs used |
204 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
12.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-04-19.0000000 |
| e |
0.72650481 |
| q (au) |
4.707082 |
| a (au) |
17.210839 |
| i (deg) |
14.054928 |
| Ω (om, deg) |
81.928817 |
| ω (w, deg) |
19.264638 |
| M (ma, deg) |
1.854331 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.536 + 5.031\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.536 |
| n |
5.031 |
| gf |
1.000 |
| gb |
-0.931 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
18:03:06.57 |
-25:25:08.5 |
HIP 88463 |
10.61 |
| 2026-02-03 12:00 |
18:03:10.71 |
-25:25:11.5 |
HIP 88463 |
9.91 |
| 2026-02-04 00:00 |
18:03:14.83 |
-25:25:14.5 |
HIP 88463 |
9.26 |
| 2026-02-04 12:00 |
18:03:18.92 |
-25:25:17.5 |
HIP 88463 |
8.67 |
| 2026-02-05 00:00 |
18:03:22.99 |
-25:25:20.6 |
HIP 88463 |
8.13 |
| 2026-02-05 12:00 |
18:03:27.02 |
-25:25:23.6 |
HIP 88463 |
7.68 |
| 2026-02-06 00:00 |
18:03:31.02 |
-25:25:26.7 |
HIP 88463 |
7.31 |
| 2026-02-06 12:00 |
18:03:35.00 |
-25:25:29.7 |
HIP 88463 |
7.05 |
| 2026-02-07 00:00 |
18:03:38.95 |
-25:25:32.8 |
HIP 88463 |
6.89 |
| 2026-02-07 12:00 |
18:03:42.86 |
-25:25:35.9 |
HIP 88463 |
6.85 |
| 2026-02-08 00:00 |
18:03:46.75 |
-25:25:39.0 |
HIP 88463 |
6.93 |
| 2026-02-08 12:00 |
18:03:50.61 |
-25:25:42.1 |
HIP 88463 |
7.11 |
| 2026-02-09 00:00 |
18:03:54.43 |
-25:25:45.2 |
HIP 88463 |
7.38 |
| 2026-02-09 12:00 |
18:03:58.23 |
-25:25:48.4 |
HIP 88463 |
7.74 |
| 2026-02-10 00:00 |
18:04:01.99 |
-25:25:51.5 |
HIP 88463 |
8.18 |
| 2026-02-10 12:00 |
18:04:05.73 |
-25:25:54.7 |
HIP 88463 |
8.67 |
| 2026-02-11 00:00 |
18:04:09.43 |
-25:25:57.8 |
HIP 88463 |
9.21 |
| 2026-02-11 12:00 |
18:04:13.10 |
-25:26:01.0 |
HIP 88463 |
9.79 |
| 2026-02-12 00:00 |
18:04:16.73 |
-25:26:04.2 |
HIP 88463 |
10.39 |
| 2026-02-12 12:00 |
18:04:20.34 |
-25:26:07.4 |
HIP 88463 |
11.02 |
| 2026-02-13 00:00 |
18:04:23.91 |
-25:26:10.6 |
HIP 88541 |
11.58 |
| 2026-02-13 12:00 |
18:04:27.45 |
-25:26:13.9 |
HIP 88541 |
11.17 |
| 2026-02-14 00:00 |
18:04:30.96 |
-25:26:17.1 |
HIP 88541 |
10.81 |
| 2026-02-14 12:00 |
18:04:34.43 |
-25:26:20.4 |
HIP 88541 |
10.49 |
| 2026-02-15 00:00 |
18:04:37.87 |
-25:26:23.6 |
HIP 88541 |
10.23 |
| 2026-02-15 12:00 |
18:04:41.28 |
-25:26:26.9 |
HIP 88541 |
10.03 |
| 2026-02-16 00:00 |
18:04:44.65 |
-25:26:30.2 |
HIP 88541 |
9.88 |
| 2026-02-16 12:00 |
18:04:47.99 |
-25:26:33.5 |
HIP 88541 |
9.78 |
| 2026-02-17 00:00 |
18:04:51.29 |
-25:26:36.8 |
HIP 88541 |
9.75 |
| 2026-02-17 12:00 |
18:04:54.56 |
-25:26:40.1 |
HIP 88541 |
9.77 |
| 2026-02-18 00:00 |
18:04:57.79 |
-25:26:43.5 |
HIP 88541 |
9.84 |
| 2026-02-18 12:00 |
18:05:00.99 |
-25:26:46.8 |
HIP 88541 |
9.97 |
| 2026-02-19 00:00 |
18:05:04.16 |
-25:26:50.2 |
HIP 88541 |
10.14 |
| 2026-02-19 12:00 |
18:05:07.28 |
-25:26:53.6 |
HIP 88541 |
10.36 |
| 2026-02-20 00:00 |
18:05:10.37 |
-25:26:57.0 |
HIP 88541 |
10.61 |
| 2026-02-20 12:00 |
18:05:13.43 |
-25:27:00.4 |
HIP 88541 |
10.90 |
| 2026-02-21 00:00 |
18:05:16.45 |
-25:27:03.8 |
HIP 88541 |
11.22 |
| 2026-02-21 12:00 |
18:05:19.43 |
-25:27:07.2 |
HIP 88541 |
11.57 |
| 2026-02-22 00:00 |
18:05:22.38 |
-25:27:10.6 |
HIP 88541 |
11.93 |
| 2026-02-22 12:00 |
18:05:25.29 |
-25:27:14.1 |
HIP 88541 |
12.32 |
| 2026-02-23 00:00 |
18:05:28.16 |
-25:27:17.6 |
HIP 88541 |
12.73 |
| 2026-02-23 12:00 |
18:05:30.99 |
-25:27:21.1 |
HIP 88541 |
13.14 |
| 2026-02-24 00:00 |
18:05:33.79 |
-25:27:24.5 |
HIP 88541 |
13.57 |