| 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) |
| 2026-07-29 00:00 |
07:12:26.59 |
+45:08:58.9 |
HIP 34746 |
10.92 |
| 2026-07-29 12:00 |
07:12:31.78 |
+45:08:53.8 |
HIP 34746 |
11.61 |
| 2026-07-30 00:00 |
07:12:36.95 |
+45:08:49.0 |
HIP 34746 |
12.33 |
| 2026-07-30 12:00 |
07:12:42.10 |
+45:08:44.3 |
HIP 34746 |
13.07 |
| 2026-07-31 00:00 |
07:12:47.24 |
+45:08:39.9 |
HIP 34746 |
13.83 |
| 2026-07-31 12:00 |
07:12:52.35 |
+45:08:35.7 |
HIP 34746 |
14.60 |
| 2026-08-01 00:00 |
07:12:57.45 |
+45:08:31.7 |
HIP 34746 |
15.39 |
| 2026-08-01 12:00 |
07:13:02.53 |
+45:08:27.9 |
HIP 34746 |
16.19 |
| 2026-08-02 00:00 |
07:13:07.59 |
+45:08:24.4 |
HIP 34746 |
17.00 |
| 2026-08-02 12:00 |
07:13:12.62 |
+45:08:21.0 |
HIP 34746 |
17.81 |
| 2026-08-03 00:00 |
07:13:17.64 |
+45:08:17.9 |
HIP 34746 |
18.63 |
| 2026-08-03 12:00 |
07:13:22.64 |
+45:08:15.0 |
HIP 34746 |
19.45 |
| 2026-08-04 00:00 |
07:13:27.61 |
+45:08:12.3 |
HIP 34746 |
20.28 |
| 2026-08-04 12:00 |
07:13:32.57 |
+45:08:09.8 |
HIP 34746 |
21.10 |
| 2026-08-05 00:00 |
07:13:37.50 |
+45:08:07.5 |
HIP 34746 |
21.93 |
| 2026-08-05 12:00 |
07:13:42.41 |
+45:08:05.5 |
HIP 34746 |
22.76 |
| 2026-08-06 00:00 |
07:13:47.30 |
+45:08:03.6 |
HIP 35140 |
22.57 |
| 2026-08-06 12:00 |
07:13:52.16 |
+45:08:02.0 |
HIP 35140 |
21.73 |
| 2026-08-07 00:00 |
07:13:57.01 |
+45:08:00.6 |
HIP 35140 |
20.90 |
| 2026-08-07 12:00 |
07:14:01.82 |
+45:07:59.4 |
HIP 35140 |
20.08 |
| 2026-08-08 00:00 |
07:14:06.62 |
+45:07:58.4 |
HIP 35140 |
19.26 |
| 2026-08-08 12:00 |
07:14:11.39 |
+45:07:57.7 |
HIP 35140 |
18.45 |
| 2026-08-09 00:00 |
07:14:16.13 |
+45:07:57.1 |
HIP 35140 |
17.65 |
| 2026-08-09 12:00 |
07:14:20.85 |
+45:07:56.8 |
HIP 35140 |
16.85 |
| 2026-08-10 00:00 |
07:14:25.55 |
+45:07:56.7 |
HIP 35140 |
16.07 |
| 2026-08-10 12:00 |
07:14:30.21 |
+45:07:56.8 |
HIP 35140 |
15.29 |
| 2026-08-11 00:00 |
07:14:34.86 |
+45:07:57.1 |
HIP 35140 |
14.53 |
| 2026-08-11 12:00 |
07:14:39.47 |
+45:07:57.7 |
HIP 35140 |
13.78 |
| 2026-08-12 00:00 |
07:14:44.06 |
+45:07:58.4 |
HIP 35140 |
13.04 |
| 2026-08-12 12:00 |
07:14:48.62 |
+45:07:59.4 |
HIP 35140 |
12.32 |
| 2026-08-13 00:00 |
07:14:53.15 |
+45:08:00.6 |
HIP 35140 |
11.62 |
| 2026-08-13 12:00 |
07:14:57.65 |
+45:08:02.0 |
HIP 35140 |
10.93 |
| 2026-08-14 00:00 |
07:15:02.13 |
+45:08:03.6 |
HIP 35140 |
10.27 |
| 2026-08-14 12:00 |
07:15:06.57 |
+45:08:05.5 |
HIP 35140 |
9.63 |
| 2026-08-15 00:00 |
07:15:10.99 |
+45:08:07.5 |
HIP 35140 |
9.02 |
| 2026-08-15 12:00 |
07:15:15.37 |
+45:08:09.8 |
HIP 35140 |
8.45 |
| 2026-08-16 00:00 |
07:15:19.73 |
+45:08:12.3 |
HIP 35140 |
7.91 |
| 2026-08-16 12:00 |
07:15:24.06 |
+45:08:14.9 |
HIP 35140 |
7.43 |
| 2026-08-17 00:00 |
07:15:28.35 |
+45:08:17.8 |
HIP 35140 |
7.00 |
| 2026-08-17 12:00 |
07:15:32.61 |
+45:08:21.0 |
HIP 35140 |
6.64 |
| 2026-08-18 00:00 |
07:15:36.84 |
+45:08:24.3 |
HIP 35140 |
6.35 |
| 2026-08-18 12:00 |
07:15:41.04 |
+45:08:27.8 |
HIP 35140 |
6.14 |
| 2026-08-19 00:00 |
07:15:45.21 |
+45:08:31.6 |
HIP 35140 |
6.03 |