| 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) |
| 2026-05-12 00:00 |
18:04:35.86 |
-25:37:57.7 |
HIP 88541 |
3.28 |
| 2026-05-12 12:00 |
18:04:32.51 |
-25:38:01.6 |
HIP 88541 |
3.98 |
| 2026-05-13 00:00 |
18:04:29.13 |
-25:38:05.5 |
HIP 88541 |
4.70 |
| 2026-05-13 12:00 |
18:04:25.72 |
-25:38:09.3 |
HIP 88541 |
5.44 |
| 2026-05-14 00:00 |
18:04:22.28 |
-25:38:13.2 |
HIP 88541 |
6.20 |
| 2026-05-14 12:00 |
18:04:18.82 |
-25:38:17.0 |
HIP 88541 |
6.96 |
| 2026-05-15 00:00 |
18:04:15.32 |
-25:38:20.8 |
HIP 88541 |
7.74 |
| 2026-05-15 12:00 |
18:04:11.80 |
-25:38:24.6 |
HIP 88541 |
8.52 |
| 2026-05-16 00:00 |
18:04:08.25 |
-25:38:28.3 |
HIP 88541 |
9.32 |
| 2026-05-16 12:00 |
18:04:04.67 |
-25:38:32.1 |
HIP 88541 |
10.12 |
| 2026-05-17 00:00 |
18:04:01.07 |
-25:38:35.8 |
HIP 88541 |
10.92 |
| 2026-05-17 12:00 |
18:03:57.43 |
-25:38:39.5 |
HIP 88541 |
11.74 |
| 2026-05-18 00:00 |
18:03:53.78 |
-25:38:43.2 |
HIP 88541 |
12.56 |
| 2026-05-18 12:00 |
18:03:50.09 |
-25:38:46.8 |
HIP 88541 |
13.39 |
| 2026-05-19 00:00 |
18:03:46.38 |
-25:38:50.5 |
HIP 88541 |
14.22 |
| 2026-05-19 12:00 |
18:03:42.65 |
-25:38:54.1 |
HIP 88541 |
15.06 |
| 2026-05-20 00:00 |
18:03:38.89 |
-25:38:57.7 |
HIP 88541 |
15.90 |
| 2026-05-20 12:00 |
18:03:35.11 |
-25:39:01.3 |
HIP 88440 |
16.22 |
| 2026-05-21 00:00 |
18:03:31.30 |
-25:39:04.8 |
HIP 88440 |
16.03 |
| 2026-05-21 12:00 |
18:03:27.47 |
-25:39:08.3 |
HIP 88440 |
15.88 |
| 2026-05-22 00:00 |
18:03:23.61 |
-25:39:11.8 |
HIP 88440 |
15.78 |
| 2026-05-22 12:00 |
18:03:19.73 |
-25:39:15.3 |
HIP 88440 |
15.73 |
| 2026-05-23 00:00 |
18:03:15.83 |
-25:39:18.8 |
HIP 88440 |
15.72 |
| 2026-05-23 12:00 |
18:03:11.91 |
-25:39:22.2 |
HIP 88440 |
15.77 |
| 2026-05-24 00:00 |
18:03:07.96 |
-25:39:25.6 |
HIP 88440 |
15.87 |
| 2026-05-24 12:00 |
18:03:04.00 |
-25:39:29.0 |
HIP 88440 |
16.01 |
| 2026-05-25 00:00 |
18:03:00.01 |
-25:39:32.4 |
HIP 88440 |
16.21 |
| 2026-05-25 12:00 |
18:02:56.00 |
-25:39:35.7 |
HIP 88292 |
15.71 |
| 2026-05-26 00:00 |
18:02:51.97 |
-25:39:39.0 |
HIP 88292 |
14.82 |
| 2026-05-26 12:00 |
18:02:47.92 |
-25:39:42.3 |
HIP 88292 |
13.92 |
| 2026-05-27 00:00 |
18:02:43.85 |
-25:39:45.6 |
HIP 88292 |
13.03 |
| 2026-05-27 12:00 |
18:02:39.76 |
-25:39:48.8 |
HIP 88292 |
12.13 |
| 2026-05-28 00:00 |
18:02:35.66 |
-25:39:52.0 |
HIP 88292 |
11.23 |
| 2026-05-28 12:00 |
18:02:31.53 |
-25:39:55.2 |
HIP 88292 |
10.33 |
| 2026-05-29 00:00 |
18:02:27.38 |
-25:39:58.4 |
HIP 88292 |
9.44 |
| 2026-05-29 12:00 |
18:02:23.22 |
-25:40:01.5 |
HIP 88292 |
8.55 |
| 2026-05-30 00:00 |
18:02:19.04 |
-25:40:04.6 |
HIP 88292 |
7.67 |
| 2026-05-30 12:00 |
18:02:14.84 |
-25:40:07.7 |
HIP 88292 |
6.80 |
| 2026-05-31 00:00 |
18:02:10.63 |
-25:40:10.7 |
HIP 88292 |
5.95 |
| 2026-05-31 12:00 |
18:02:06.39 |
-25:40:13.7 |
HIP 88292 |
5.14 |
| 2026-06-01 00:00 |
18:02:02.15 |
-25:40:16.7 |
HIP 88292 |
4.37 |
| 2026-06-01 12:00 |
18:01:57.88 |
-25:40:19.7 |
HIP 88292 |
3.70 |
| 2026-06-02 00:00 |
18:01:53.60 |
-25:40:22.6 |
HIP 88292 |
3.18 |