| Parameter |
Value |
| Designation |
C/2010 L4 (WISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-02-23T15:43:33.841920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:44Z |
| Obs used |
98 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
7.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-07-08.0000000 |
| e |
0.96471201 |
| q (au) |
2.825536 |
| a (au) |
80.070752 |
| i (deg) |
102.818083 |
| Ω (om, deg) |
125.540169 |
| ω (w, deg) |
95.768618 |
| M (ma, deg) |
0.184805 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.939 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.939 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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) |
| 2026-05-12 00:00 |
22:11:55.10 |
-83:02:55.9 |
HIP 109415 |
18.85 |
| 2026-05-12 12:00 |
22:12:01.17 |
-83:03:50.9 |
HIP 109415 |
17.98 |
| 2026-05-13 00:00 |
22:12:07.03 |
-83:04:46.1 |
HIP 109415 |
17.12 |
| 2026-05-13 12:00 |
22:12:12.67 |
-83:05:41.4 |
HIP 109415 |
16.26 |
| 2026-05-14 00:00 |
22:12:18.09 |
-83:06:36.8 |
HIP 109415 |
15.40 |
| 2026-05-14 12:00 |
22:12:23.29 |
-83:07:32.3 |
HIP 109415 |
14.55 |
| 2026-05-15 00:00 |
22:12:28.26 |
-83:08:28.0 |
HIP 109415 |
13.70 |
| 2026-05-15 12:00 |
22:12:33.01 |
-83:09:23.7 |
HIP 109415 |
12.87 |
| 2026-05-16 00:00 |
22:12:37.53 |
-83:10:19.6 |
HIP 109415 |
12.04 |
| 2026-05-16 12:00 |
22:12:41.82 |
-83:11:15.6 |
HIP 109415 |
11.23 |
| 2026-05-17 00:00 |
22:12:45.88 |
-83:12:11.6 |
HIP 109415 |
10.44 |
| 2026-05-17 12:00 |
22:12:49.71 |
-83:13:07.8 |
HIP 109415 |
9.67 |
| 2026-05-18 00:00 |
22:12:53.31 |
-83:14:04.1 |
HIP 109415 |
8.93 |
| 2026-05-18 12:00 |
22:12:56.67 |
-83:15:00.4 |
HIP 109415 |
8.22 |
| 2026-05-19 00:00 |
22:12:59.79 |
-83:15:56.9 |
HIP 109415 |
7.56 |
| 2026-05-19 12:00 |
22:13:02.67 |
-83:16:53.4 |
HIP 109415 |
6.95 |
| 2026-05-20 00:00 |
22:13:05.31 |
-83:17:50.0 |
HIP 109415 |
6.43 |
| 2026-05-20 12:00 |
22:13:07.71 |
-83:18:46.6 |
HIP 109415 |
6.00 |
| 2026-05-21 00:00 |
22:13:09.87 |
-83:19:43.4 |
HIP 109415 |
5.68 |
| 2026-05-21 12:00 |
22:13:11.78 |
-83:20:40.2 |
HIP 109415 |
5.51 |
| 2026-05-22 00:00 |
22:13:13.44 |
-83:21:37.0 |
HIP 109415 |
5.49 |
| 2026-05-22 12:00 |
22:13:14.85 |
-83:22:33.9 |
HIP 109415 |
5.63 |
| 2026-05-23 00:00 |
22:13:16.02 |
-83:23:30.9 |
HIP 109415 |
5.91 |
| 2026-05-23 12:00 |
22:13:16.93 |
-83:24:27.9 |
HIP 109415 |
6.32 |
| 2026-05-24 00:00 |
22:13:17.58 |
-83:25:25.0 |
HIP 109415 |
6.83 |
| 2026-05-24 12:00 |
22:13:17.99 |
-83:26:22.1 |
HIP 109415 |
7.42 |
| 2026-05-25 00:00 |
22:13:18.13 |
-83:27:19.2 |
HIP 109415 |
8.07 |
| 2026-05-25 12:00 |
22:13:18.02 |
-83:28:16.4 |
HIP 109415 |
8.78 |
| 2026-05-26 00:00 |
22:13:17.65 |
-83:29:13.6 |
HIP 109415 |
9.53 |
| 2026-05-26 12:00 |
22:13:17.01 |
-83:30:10.9 |
HIP 109415 |
10.30 |
| 2026-05-27 00:00 |
22:13:16.12 |
-83:31:08.1 |
HIP 109415 |
11.10 |
| 2026-05-27 12:00 |
22:13:14.95 |
-83:32:05.4 |
HIP 109415 |
11.92 |
| 2026-05-28 00:00 |
22:13:13.52 |
-83:33:02.7 |
HIP 109415 |
12.76 |
| 2026-05-28 12:00 |
22:13:11.83 |
-83:34:00.0 |
HIP 109415 |
13.61 |
| 2026-05-29 00:00 |
22:13:09.86 |
-83:34:57.3 |
HIP 109415 |
14.47 |
| 2026-05-29 12:00 |
22:13:07.62 |
-83:35:54.6 |
HIP 109415 |
15.34 |
| 2026-05-30 00:00 |
22:13:05.11 |
-83:36:51.9 |
HIP 109415 |
16.21 |
| 2026-05-30 12:00 |
22:13:02.32 |
-83:37:49.2 |
HIP 109415 |
17.09 |
| 2026-05-31 00:00 |
22:12:59.25 |
-83:38:46.5 |
HIP 109415 |
17.98 |
| 2026-05-31 12:00 |
22:12:55.91 |
-83:39:43.8 |
HIP 109415 |
18.88 |
| 2026-06-01 00:00 |
22:12:52.29 |
-83:40:41.0 |
HIP 109415 |
19.77 |
| 2026-06-01 12:00 |
22:12:48.38 |
-83:41:38.3 |
HIP 109415 |
20.67 |
| 2026-06-02 00:00 |
22:12:44.19 |
-83:42:35.5 |
HIP 109415 |
21.58 |