| Parameter |
Value |
| Designation |
C/2002 H2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-03-23T09:48:55.414080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:15Z |
| Obs used |
369 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
5.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-05-22.0000000 |
| e |
0.99406539 |
| q (au) |
1.634840 |
| a (au) |
275.475363 |
| i (deg) |
110.501113 |
| Ω (om, deg) |
269.002033 |
| ω (w, deg) |
20.419619 |
| M (ma, deg) |
0.012846 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.548 + 3.263\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.548 |
| n |
3.263 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
05:54:49.36 |
+24:02:27.1 |
HIP 27906 |
18.62 |
| 2026-06-01 12:00 |
05:54:51.97 |
+24:02:25.8 |
HIP 27906 |
18.88 |
| 2026-06-02 00:00 |
05:54:54.60 |
+24:02:24.6 |
HIP 27906 |
19.14 |
| 2026-06-02 12:00 |
05:54:57.23 |
+24:02:23.3 |
HIP 27906 |
19.43 |
| 2026-06-03 00:00 |
05:54:59.86 |
+24:02:22.0 |
HIP 27906 |
19.72 |
| 2026-06-03 12:00 |
05:55:02.51 |
+24:02:20.7 |
HIP 27906 |
20.03 |
| 2026-06-04 00:00 |
05:55:05.16 |
+24:02:19.4 |
HIP 27906 |
20.36 |
| 2026-06-04 12:00 |
05:55:07.81 |
+24:02:18.1 |
HIP 27906 |
20.70 |
| 2026-06-05 00:00 |
05:55:10.47 |
+24:02:16.9 |
HIP 27906 |
21.05 |
| 2026-06-05 12:00 |
05:55:13.14 |
+24:02:15.6 |
HIP 27906 |
21.42 |
| 2026-06-06 00:00 |
05:55:15.81 |
+24:02:14.3 |
HIP 27906 |
21.79 |
| 2026-06-06 12:00 |
05:55:18.49 |
+24:02:13.0 |
HIP 27906 |
22.18 |
| 2026-06-07 00:00 |
05:55:21.17 |
+24:02:11.8 |
HIP 27906 |
22.57 |
| 2026-06-07 12:00 |
05:55:23.86 |
+24:02:10.5 |
HIP 27906 |
22.98 |
| 2026-06-08 00:00 |
05:55:26.56 |
+24:02:09.2 |
HIP 27906 |
23.40 |
| 2026-06-08 12:00 |
05:55:29.25 |
+24:02:08.0 |
HIP 28154 |
23.62 |
| 2026-06-09 00:00 |
05:55:31.96 |
+24:02:06.7 |
HIP 28154 |
23.11 |
| 2026-06-09 12:00 |
05:55:34.66 |
+24:02:05.4 |
HIP 28154 |
22.62 |
| 2026-06-10 00:00 |
05:55:37.37 |
+24:02:04.2 |
HIP 28154 |
22.12 |
| 2026-06-10 12:00 |
05:55:40.09 |
+24:02:02.9 |
HIP 28154 |
21.64 |
| 2026-06-11 00:00 |
05:55:42.80 |
+24:02:01.6 |
HIP 28154 |
21.16 |
| 2026-06-11 12:00 |
05:55:45.53 |
+24:02:00.4 |
HIP 28154 |
20.68 |
| 2026-06-12 00:00 |
05:55:48.25 |
+24:01:59.1 |
HIP 28154 |
20.21 |
| 2026-06-12 12:00 |
05:55:50.98 |
+24:01:57.8 |
HIP 28154 |
19.76 |
| 2026-06-13 00:00 |
05:55:53.71 |
+24:01:56.6 |
HIP 28154 |
19.31 |
| 2026-06-13 12:00 |
05:55:56.45 |
+24:01:55.3 |
HIP 28154 |
18.86 |
| 2026-06-14 00:00 |
05:55:59.18 |
+24:01:54.1 |
HIP 28154 |
18.43 |
| 2026-06-14 12:00 |
05:56:01.92 |
+24:01:52.8 |
HIP 28154 |
18.01 |
| 2026-06-15 00:00 |
05:56:04.66 |
+24:01:51.5 |
HIP 28154 |
17.61 |
| 2026-06-15 12:00 |
05:56:07.41 |
+24:01:50.3 |
HIP 28154 |
17.21 |
| 2026-06-16 00:00 |
05:56:10.15 |
+24:01:49.0 |
HIP 28154 |
16.83 |
| 2026-06-16 12:00 |
05:56:12.90 |
+24:01:47.8 |
HIP 28154 |
16.46 |
| 2026-06-17 00:00 |
05:56:15.65 |
+24:01:46.5 |
HIP 28154 |
16.11 |
| 2026-06-17 12:00 |
05:56:18.39 |
+24:01:45.3 |
HIP 28154 |
15.78 |
| 2026-06-18 00:00 |
05:56:21.14 |
+24:01:44.0 |
HIP 28154 |
15.47 |
| 2026-06-18 12:00 |
05:56:23.90 |
+24:01:42.7 |
HIP 28154 |
15.17 |
| 2026-06-19 00:00 |
05:56:26.65 |
+24:01:41.5 |
HIP 28154 |
14.89 |
| 2026-06-19 12:00 |
05:56:29.40 |
+24:01:40.2 |
HIP 28154 |
14.64 |
| 2026-06-20 00:00 |
05:56:32.15 |
+24:01:39.0 |
HIP 28154 |
14.41 |
| 2026-06-20 12:00 |
05:56:34.90 |
+24:01:37.7 |
HIP 28154 |
14.20 |
| 2026-06-21 00:00 |
05:56:37.65 |
+24:01:36.5 |
HIP 28154 |
14.02 |
| 2026-06-21 12:00 |
05:56:40.41 |
+24:01:35.2 |
HIP 28154 |
13.87 |
| 2026-06-22 00:00 |
05:56:43.16 |
+24:01:34.0 |
HIP 28154 |
13.74 |