| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
18:01:49.30 |
-25:40:25.5 |
HIP 88292 |
2.89 |
| 2026-06-03 00:00 |
18:01:44.99 |
-25:40:28.4 |
HIP 88292 |
2.92 |
| 2026-06-03 12:00 |
18:01:40.67 |
-25:40:31.3 |
HIP 88292 |
3.25 |
| 2026-06-04 00:00 |
18:01:36.33 |
-25:40:34.1 |
HIP 88292 |
3.81 |
| 2026-06-04 12:00 |
18:01:31.98 |
-25:40:36.9 |
HIP 88292 |
4.52 |
| 2026-06-05 00:00 |
18:01:27.61 |
-25:40:39.6 |
HIP 88292 |
5.32 |
| 2026-06-05 12:00 |
18:01:23.23 |
-25:40:42.4 |
HIP 88292 |
6.17 |
| 2026-06-06 00:00 |
18:01:18.84 |
-25:40:45.1 |
HIP 88292 |
7.06 |
| 2026-06-06 12:00 |
18:01:14.43 |
-25:40:47.8 |
HIP 88292 |
7.98 |
| 2026-06-07 00:00 |
18:01:10.01 |
-25:40:50.4 |
HIP 88292 |
8.92 |
| 2026-06-07 12:00 |
18:01:05.59 |
-25:40:53.0 |
HIP 88292 |
9.87 |
| 2026-06-08 00:00 |
18:01:01.15 |
-25:40:55.6 |
HIP 88292 |
10.83 |
| 2026-06-08 12:00 |
18:00:56.69 |
-25:40:58.1 |
HIP 88292 |
11.80 |
| 2026-06-09 00:00 |
18:00:52.23 |
-25:41:00.7 |
HIP 88292 |
12.78 |
| 2026-06-09 12:00 |
18:00:47.76 |
-25:41:03.2 |
HIP 88292 |
13.76 |
| 2026-06-10 00:00 |
18:00:43.28 |
-25:41:05.6 |
HIP 88292 |
14.75 |
| 2026-06-10 12:00 |
18:00:38.79 |
-25:41:08.1 |
HIP 88292 |
15.75 |
| 2026-06-11 00:00 |
18:00:34.29 |
-25:41:10.5 |
HIP 88292 |
16.74 |
| 2026-06-11 12:00 |
18:00:29.78 |
-25:41:12.8 |
HIP 88292 |
17.75 |
| 2026-06-12 00:00 |
18:00:25.26 |
-25:41:15.2 |
HIP 88074 |
17.44 |
| 2026-06-12 12:00 |
18:00:20.74 |
-25:41:17.5 |
HIP 88074 |
16.51 |
| 2026-06-13 00:00 |
18:00:16.21 |
-25:41:19.7 |
HIP 88074 |
15.60 |
| 2026-06-13 12:00 |
18:00:11.67 |
-25:41:22.0 |
HIP 88074 |
14.71 |
| 2026-06-14 00:00 |
18:00:07.12 |
-25:41:24.2 |
HIP 88074 |
13.83 |
| 2026-06-14 12:00 |
18:00:02.57 |
-25:41:26.4 |
HIP 88074 |
12.97 |
| 2026-06-15 00:00 |
17:59:58.02 |
-25:41:28.5 |
HIP 88074 |
12.14 |
| 2026-06-15 12:00 |
17:59:53.45 |
-25:41:30.7 |
HIP 88074 |
11.33 |
| 2026-06-16 00:00 |
17:59:48.89 |
-25:41:32.7 |
HIP 88074 |
10.57 |
| 2026-06-16 12:00 |
17:59:44.32 |
-25:41:34.8 |
HIP 88074 |
9.85 |
| 2026-06-17 00:00 |
17:59:39.74 |
-25:41:36.8 |
HIP 88074 |
9.20 |
| 2026-06-17 12:00 |
17:59:35.16 |
-25:41:38.8 |
HIP 88074 |
8.62 |
| 2026-06-18 00:00 |
17:59:30.58 |
-25:41:40.8 |
HIP 88074 |
8.12 |
| 2026-06-18 12:00 |
17:59:26.00 |
-25:41:42.7 |
HIP 88074 |
7.74 |
| 2026-06-19 00:00 |
17:59:21.41 |
-25:41:44.6 |
HIP 88074 |
7.48 |
| 2026-06-19 12:00 |
17:59:16.82 |
-25:41:46.5 |
HIP 88074 |
7.36 |
| 2026-06-20 00:00 |
17:59:12.24 |
-25:41:48.3 |
HIP 88074 |
7.38 |
| 2026-06-20 12:00 |
17:59:07.65 |
-25:41:50.1 |
HIP 88074 |
7.54 |
| 2026-06-21 00:00 |
17:59:03.06 |
-25:41:51.9 |
HIP 88074 |
7.84 |
| 2026-06-21 12:00 |
17:58:58.47 |
-25:41:53.6 |
HIP 88074 |
8.26 |
| 2026-06-22 00:00 |
17:58:53.88 |
-25:41:55.3 |
HIP 88074 |
8.79 |