| Parameter |
Value |
| Designation |
C/2013 H2 (Boattini) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-01-23T05:03:10.604160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:35Z |
| Obs used |
221 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
9.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-12-30.0000000 |
| e |
1.00184898 |
| q (au) |
7.498743 |
| a (au) |
-4055.614389 |
| i (deg) |
128.396346 |
| Ω (om, deg) |
262.745961 |
| ω (w, deg) |
35.998358 |
| M (ma, deg) |
-0.000092 |
Magnitude
Scatter + Global Linear
$$
M_a = (0.912 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
0.912 |
| n |
6.000 |
| gf |
0.826 |
| gb |
-0.918 |
| k |
1.000 |
| δ90 |
4.146 |
| 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) |
| 2026-03-26 00:00 |
06:58:11.63 |
+46:59:14.5 |
HIP 33368 |
18.67 |
| 2026-03-26 12:00 |
06:58:09.74 |
+46:58:38.1 |
HIP 33368 |
18.37 |
| 2026-03-27 00:00 |
06:58:07.91 |
+46:58:01.6 |
HIP 33368 |
18.09 |
| 2026-03-27 12:00 |
06:58:06.15 |
+46:57:25.1 |
HIP 33368 |
17.86 |
| 2026-03-28 00:00 |
06:58:04.44 |
+46:56:48.5 |
HIP 33368 |
17.65 |
| 2026-03-28 12:00 |
06:58:02.80 |
+46:56:11.8 |
HIP 33368 |
17.48 |
| 2026-03-29 00:00 |
06:58:01.23 |
+46:55:35.1 |
HIP 33415 |
17.31 |
| 2026-03-29 12:00 |
06:57:59.71 |
+46:54:58.3 |
HIP 33415 |
16.68 |
| 2026-03-30 00:00 |
06:57:58.26 |
+46:54:21.5 |
HIP 33415 |
16.05 |
| 2026-03-30 12:00 |
06:57:56.87 |
+46:53:44.7 |
HIP 33415 |
15.44 |
| 2026-03-31 00:00 |
06:57:55.54 |
+46:53:07.8 |
HIP 33415 |
14.83 |
| 2026-03-31 12:00 |
06:57:54.27 |
+46:52:30.8 |
HIP 33415 |
14.24 |
| 2026-04-01 00:00 |
06:57:53.07 |
+46:51:53.8 |
HIP 33415 |
13.66 |
| 2026-04-01 12:00 |
06:57:51.93 |
+46:51:16.8 |
HIP 33415 |
13.09 |
| 2026-04-02 00:00 |
06:57:50.84 |
+46:50:39.8 |
HIP 33415 |
12.54 |
| 2026-04-02 12:00 |
06:57:49.82 |
+46:50:02.7 |
HIP 33415 |
12.00 |
| 2026-04-03 00:00 |
06:57:48.86 |
+46:49:25.6 |
HIP 33415 |
11.48 |
| 2026-04-03 12:00 |
06:57:47.97 |
+46:48:48.4 |
HIP 33415 |
10.99 |
| 2026-04-04 00:00 |
06:57:47.13 |
+46:48:11.2 |
HIP 33415 |
10.52 |
| 2026-04-04 12:00 |
06:57:46.36 |
+46:47:34.0 |
HIP 33415 |
10.07 |
| 2026-04-05 00:00 |
06:57:45.64 |
+46:46:56.8 |
HIP 33415 |
9.66 |
| 2026-04-05 12:00 |
06:57:44.99 |
+46:46:19.6 |
HIP 33415 |
9.28 |
| 2026-04-06 00:00 |
06:57:44.40 |
+46:45:42.3 |
HIP 33415 |
8.93 |
| 2026-04-06 12:00 |
06:57:43.86 |
+46:45:05.0 |
HIP 33415 |
8.63 |
| 2026-04-07 00:00 |
06:57:43.39 |
+46:44:27.8 |
HIP 33415 |
8.38 |
| 2026-04-07 12:00 |
06:57:42.98 |
+46:43:50.5 |
HIP 33415 |
8.17 |
| 2026-04-08 00:00 |
06:57:42.63 |
+46:43:13.1 |
HIP 33415 |
8.02 |
| 2026-04-08 12:00 |
06:57:42.34 |
+46:42:35.8 |
HIP 33415 |
7.93 |
| 2026-04-09 00:00 |
06:57:42.11 |
+46:41:58.5 |
HIP 33415 |
7.89 |
| 2026-04-09 12:00 |
06:57:41.94 |
+46:41:21.2 |
HIP 33415 |
7.91 |
| 2026-04-10 00:00 |
06:57:41.82 |
+46:40:43.9 |
HIP 33415 |
8.00 |
| 2026-04-10 12:00 |
06:57:41.77 |
+46:40:06.5 |
HIP 33415 |
8.14 |
| 2026-04-11 00:00 |
06:57:41.78 |
+46:39:29.2 |
HIP 33415 |
8.33 |
| 2026-04-11 12:00 |
06:57:41.85 |
+46:38:51.9 |
HIP 33415 |
8.57 |
| 2026-04-12 00:00 |
06:57:41.97 |
+46:38:14.6 |
HIP 33415 |
8.86 |
| 2026-04-12 12:00 |
06:57:42.15 |
+46:37:37.3 |
HIP 33415 |
9.19 |
| 2026-04-13 00:00 |
06:57:42.40 |
+46:37:00.0 |
HIP 33415 |
9.56 |
| 2026-04-13 12:00 |
06:57:42.70 |
+46:36:22.8 |
HIP 33415 |
9.96 |
| 2026-04-14 00:00 |
06:57:43.06 |
+46:35:45.5 |
HIP 33415 |
10.40 |
| 2026-04-14 12:00 |
06:57:43.48 |
+46:35:08.3 |
HIP 33415 |
10.85 |
| 2026-04-15 00:00 |
06:57:43.95 |
+46:34:31.1 |
HIP 33415 |
11.33 |
| 2026-04-15 12:00 |
06:57:44.49 |
+46:33:53.9 |
HIP 33389 |
11.77 |
| 2026-04-16 00:00 |
06:57:45.08 |
+46:33:16.7 |
HIP 33389 |
11.81 |