C/2002 H2 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
05:52:48.64 |
+24:09:38.4 |
HIP 27851 |
12.76 |
| 2026-02-03 12:00 |
05:52:46.48 |
+24:09:36.1 |
HIP 27851 |
13.18 |
| 2026-02-04 00:00 |
05:52:44.34 |
+24:09:33.8 |
HIP 27851 |
13.61 |
| 2026-02-04 12:00 |
05:52:42.22 |
+24:09:31.5 |
HIP 27851 |
14.03 |
| 2026-02-05 00:00 |
05:52:40.12 |
+24:09:29.2 |
HIP 27851 |
14.45 |
| 2026-02-05 12:00 |
05:52:38.04 |
+24:09:26.9 |
HIP 27851 |
14.88 |
| 2026-02-06 00:00 |
05:52:35.98 |
+24:09:24.5 |
HIP 27851 |
15.30 |
| 2026-02-06 12:00 |
05:52:33.94 |
+24:09:22.2 |
HIP 27851 |
15.72 |
| 2026-02-07 00:00 |
05:52:31.92 |
+24:09:19.9 |
HIP 27851 |
16.14 |
| 2026-02-07 12:00 |
05:52:29.93 |
+24:09:17.6 |
HIP 27851 |
16.56 |
| 2026-02-08 00:00 |
05:52:27.95 |
+24:09:15.3 |
HIP 27851 |
16.97 |
| 2026-02-08 12:00 |
05:52:25.99 |
+24:09:12.9 |
HIP 27851 |
17.38 |
| 2026-02-09 00:00 |
05:52:24.06 |
+24:09:10.6 |
HIP 27851 |
17.79 |
| 2026-02-09 12:00 |
05:52:22.14 |
+24:09:08.3 |
HIP 27851 |
18.20 |
| 2026-02-10 00:00 |
05:52:20.25 |
+24:09:06.0 |
HIP 27851 |
18.61 |
| 2026-02-10 12:00 |
05:52:18.38 |
+24:09:03.7 |
HIP 27851 |
19.01 |
| 2026-02-11 00:00 |
05:52:16.53 |
+24:09:01.4 |
HIP 27652 |
19.10 |
| 2026-02-11 12:00 |
05:52:14.70 |
+24:08:59.0 |
HIP 27652 |
18.78 |
| 2026-02-12 00:00 |
05:52:12.90 |
+24:08:56.7 |
HIP 27652 |
18.47 |
| 2026-02-12 12:00 |
05:52:11.11 |
+24:08:54.4 |
HIP 27652 |
18.16 |
| 2026-02-13 00:00 |
05:52:09.35 |
+24:08:52.1 |
HIP 27652 |
17.86 |
| 2026-02-13 12:00 |
05:52:07.61 |
+24:08:49.8 |
HIP 27652 |
17.57 |
| 2026-02-14 00:00 |
05:52:05.90 |
+24:08:47.5 |
HIP 27652 |
17.29 |
| 2026-02-14 12:00 |
05:52:04.20 |
+24:08:45.2 |
HIP 27652 |
17.01 |
| 2026-02-15 00:00 |
05:52:02.53 |
+24:08:42.9 |
HIP 27652 |
16.74 |
| 2026-02-15 12:00 |
05:52:00.89 |
+24:08:40.6 |
HIP 27652 |
16.48 |
| 2026-02-16 00:00 |
05:51:59.26 |
+24:08:38.3 |
HIP 27652 |
16.23 |
| 2026-02-16 12:00 |
05:51:57.66 |
+24:08:36.0 |
HIP 27652 |
15.98 |
| 2026-02-17 00:00 |
05:51:56.08 |
+24:08:33.7 |
HIP 27652 |
15.74 |
| 2026-02-17 12:00 |
05:51:54.53 |
+24:08:31.4 |
HIP 27652 |
15.51 |
| 2026-02-18 00:00 |
05:51:52.99 |
+24:08:29.1 |
HIP 27652 |
15.29 |
| 2026-02-18 12:00 |
05:51:51.49 |
+24:08:26.8 |
HIP 27652 |
15.08 |
| 2026-02-19 00:00 |
05:51:50.00 |
+24:08:24.5 |
HIP 27652 |
14.87 |
| 2026-02-19 12:00 |
05:51:48.54 |
+24:08:22.2 |
HIP 27652 |
14.67 |
| 2026-02-20 00:00 |
05:51:47.10 |
+24:08:19.9 |
HIP 27652 |
14.48 |
| 2026-02-20 12:00 |
05:51:45.69 |
+24:08:17.7 |
HIP 27652 |
14.29 |
| 2026-02-21 00:00 |
05:51:44.30 |
+24:08:15.4 |
HIP 27652 |
14.12 |
| 2026-02-21 12:00 |
05:51:42.94 |
+24:08:13.1 |
HIP 27652 |
13.95 |
| 2026-02-22 00:00 |
05:51:41.60 |
+24:08:10.8 |
HIP 27652 |
13.79 |
| 2026-02-22 12:00 |
05:51:40.28 |
+24:08:08.6 |
HIP 27652 |
13.63 |
| 2026-02-23 00:00 |
05:51:38.99 |
+24:08:06.3 |
HIP 27652 |
13.49 |
| 2026-02-23 12:00 |
05:51:37.72 |
+24:08:04.0 |
HIP 27652 |
13.35 |
| 2026-02-24 00:00 |
05:51:36.48 |
+24:08:01.8 |
HIP 27652 |
13.21 |