C/2013 H1 (La Sagra)
| Parameter |
Value |
| Designation |
C/2013 H1 (La Sagra) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-05-19T16:02:02.639040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:34Z |
| Obs used |
270 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
22.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-05-18.0000000 |
| e |
0.98542562 |
| q (au) |
2.646966 |
| a (au) |
181.617687 |
| i (deg) |
27.089519 |
| Ω (om, deg) |
84.969862 |
| ω (w, deg) |
136.581161 |
| M (ma, deg) |
359.999328 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.300 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.300 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
01:06:27.12 |
-21:08:46.5 |
HIP 5056 |
26.15 |
| 2026-02-03 12:00 |
01:06:29.29 |
-21:08:07.4 |
HIP 5056 |
26.39 |
| 2026-02-04 00:00 |
01:06:31.49 |
-21:07:28.3 |
HIP 5056 |
26.67 |
| 2026-02-04 12:00 |
01:06:33.72 |
-21:06:49.2 |
HIP 5056 |
26.98 |
| 2026-02-05 00:00 |
01:06:35.98 |
-21:06:10.1 |
HIP 5056 |
27.31 |
| 2026-02-05 12:00 |
01:06:38.28 |
-21:05:30.9 |
HIP 5056 |
27.68 |
| 2026-02-06 00:00 |
01:06:40.60 |
-21:04:51.7 |
HIP 5056 |
28.07 |
| 2026-02-06 12:00 |
01:06:42.95 |
-21:04:12.5 |
HIP 5056 |
28.49 |
| 2026-02-07 00:00 |
01:06:45.34 |
-21:03:33.3 |
HIP 5056 |
28.93 |
| 2026-02-07 12:00 |
01:06:47.75 |
-21:02:54.1 |
HIP 5056 |
29.40 |
| 2026-02-08 00:00 |
01:06:50.19 |
-21:02:14.9 |
HIP 5056 |
29.90 |
| 2026-02-08 12:00 |
01:06:52.67 |
-21:01:35.6 |
HIP 5056 |
30.42 |
| 2026-02-09 00:00 |
01:06:55.17 |
-21:00:56.4 |
HIP 5056 |
30.96 |
| 2026-02-09 12:00 |
01:06:57.70 |
-21:00:17.1 |
HIP 5056 |
31.52 |
| 2026-02-10 00:00 |
01:07:00.26 |
-20:59:37.9 |
HIP 5056 |
32.11 |
| 2026-02-10 12:00 |
01:07:02.85 |
-20:58:58.6 |
HIP 5056 |
32.71 |
| 2026-02-11 00:00 |
01:07:05.47 |
-20:58:19.3 |
HIP 5056 |
33.34 |
| 2026-02-11 12:00 |
01:07:08.12 |
-20:57:40.1 |
HIP 5056 |
33.98 |
| 2026-02-12 00:00 |
01:07:10.80 |
-20:57:00.9 |
HIP 5056 |
34.64 |
| 2026-02-12 12:00 |
01:07:13.50 |
-20:56:21.7 |
HIP 5056 |
35.32 |
| 2026-02-13 00:00 |
01:07:16.23 |
-20:55:42.4 |
HIP 5056 |
36.02 |
| 2026-02-13 12:00 |
01:07:18.99 |
-20:55:03.3 |
HIP 5068 |
36.66 |
| 2026-02-14 00:00 |
01:07:21.78 |
-20:54:24.1 |
HIP 5068 |
37.10 |
| 2026-02-14 12:00 |
01:07:24.60 |
-20:53:44.9 |
HIP 5068 |
37.55 |
| 2026-02-15 00:00 |
01:07:27.44 |
-20:53:05.8 |
HIP 5068 |
38.04 |
| 2026-02-15 12:00 |
01:07:30.31 |
-20:52:26.7 |
HIP 5068 |
38.54 |
| 2026-02-16 00:00 |
01:07:33.21 |
-20:51:47.7 |
HIP 5068 |
39.06 |
| 2026-02-16 12:00 |
01:07:36.13 |
-20:51:08.6 |
HIP 5068 |
39.61 |
| 2026-02-17 00:00 |
01:07:39.08 |
-20:50:29.6 |
HIP 5068 |
40.18 |
| 2026-02-17 12:00 |
01:07:42.06 |
-20:49:50.7 |
HIP 5068 |
40.77 |
| 2026-02-18 00:00 |
01:07:45.06 |
-20:49:11.8 |
HIP 5068 |
41.38 |
| 2026-02-18 12:00 |
01:07:48.09 |
-20:48:32.9 |
HIP 5068 |
42.01 |
| 2026-02-19 00:00 |
01:07:51.14 |
-20:47:54.1 |
HIP 5068 |
42.65 |
| 2026-02-19 12:00 |
01:07:54.22 |
-20:47:15.3 |
HIP 5452 |
43.08 |
| 2026-02-20 00:00 |
01:07:57.32 |
-20:46:36.6 |
HIP 5452 |
42.13 |
| 2026-02-20 12:00 |
01:08:00.45 |
-20:45:57.9 |
HIP 5452 |
41.17 |
| 2026-02-21 00:00 |
01:08:03.60 |
-20:45:19.3 |
HIP 5452 |
40.22 |
| 2026-02-21 12:00 |
01:08:06.78 |
-20:44:40.8 |
HIP 5452 |
39.26 |
| 2026-02-22 00:00 |
01:08:09.98 |
-20:44:02.3 |
HIP 5452 |
38.30 |
| 2026-02-22 12:00 |
01:08:13.20 |
-20:43:23.9 |
HIP 5452 |
37.34 |
| 2026-02-23 00:00 |
01:08:16.45 |
-20:42:45.5 |
HIP 5452 |
36.38 |
| 2026-02-23 12:00 |
01:08:19.72 |
-20:42:07.2 |
HIP 5452 |
35.42 |
| 2026-02-24 00:00 |
01:08:23.02 |
-20:41:29.0 |
HIP 5452 |
34.45 |