C/2010 D4 (WISE)
| Parameter |
Value |
| Designation |
C/2010 D4 (WISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-03-30T22:23:21.324480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:40Z |
| Obs used |
113 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-04-12.0000000 |
| e |
0.88945973 |
| q (au) |
7.148209 |
| a (au) |
64.666104 |
| i (deg) |
105.659652 |
| Ω (om, deg) |
266.783514 |
| ω (w, deg) |
44.489319 |
| M (ma, deg) |
0.714674 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.542 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.542 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.818 |
| 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 |
05:49:18.78 |
+31:54:45.7 |
HIP 27538 |
10.91 |
| 2026-02-03 12:00 |
05:49:15.16 |
+31:54:30.3 |
HIP 27538 |
11.30 |
| 2026-02-04 00:00 |
05:49:11.59 |
+31:54:14.9 |
HIP 27538 |
11.73 |
| 2026-02-04 12:00 |
05:49:08.04 |
+31:53:59.4 |
HIP 27538 |
12.19 |
| 2026-02-05 00:00 |
05:49:04.54 |
+31:53:43.9 |
HIP 27538 |
12.68 |
| 2026-02-05 12:00 |
05:49:01.06 |
+31:53:28.4 |
HIP 27538 |
13.19 |
| 2026-02-06 00:00 |
05:48:57.62 |
+31:53:12.8 |
HIP 27538 |
13.71 |
| 2026-02-06 12:00 |
05:48:54.22 |
+31:52:57.1 |
HIP 27538 |
14.26 |
| 2026-02-07 00:00 |
05:48:50.85 |
+31:52:41.4 |
HIP 27538 |
14.81 |
| 2026-02-07 12:00 |
05:48:47.52 |
+31:52:25.7 |
HIP 27538 |
15.38 |
| 2026-02-08 00:00 |
05:48:44.22 |
+31:52:10.0 |
HIP 27538 |
15.96 |
| 2026-02-08 12:00 |
05:48:40.96 |
+31:51:54.2 |
HIP 27538 |
16.54 |
| 2026-02-09 00:00 |
05:48:37.74 |
+31:51:38.3 |
HIP 27538 |
17.12 |
| 2026-02-09 12:00 |
05:48:34.55 |
+31:51:22.4 |
HIP 27538 |
17.71 |
| 2026-02-10 00:00 |
05:48:31.40 |
+31:51:06.5 |
HIP 27538 |
18.31 |
| 2026-02-10 12:00 |
05:48:28.29 |
+31:50:50.6 |
HIP 27538 |
18.90 |
| 2026-02-11 00:00 |
05:48:25.21 |
+31:50:34.6 |
HIP 27538 |
19.49 |
| 2026-02-11 12:00 |
05:48:22.17 |
+31:50:18.6 |
HIP 27538 |
20.08 |
| 2026-02-12 00:00 |
05:48:19.17 |
+31:50:02.5 |
HIP 27538 |
20.68 |
| 2026-02-12 12:00 |
05:48:16.21 |
+31:49:46.5 |
HIP 27538 |
21.27 |
| 2026-02-13 00:00 |
05:48:13.28 |
+31:49:30.4 |
HIP 27538 |
21.85 |
| 2026-02-13 12:00 |
05:48:10.39 |
+31:49:14.2 |
HIP 27538 |
22.44 |
| 2026-02-14 00:00 |
05:48:07.55 |
+31:48:58.1 |
HIP 27538 |
23.02 |
| 2026-02-14 12:00 |
05:48:04.74 |
+31:48:41.9 |
HIP 27538 |
23.59 |
| 2026-02-15 00:00 |
05:48:01.96 |
+31:48:25.7 |
HIP 27538 |
24.17 |
| 2026-02-15 12:00 |
05:47:59.23 |
+31:48:09.4 |
HIP 27538 |
24.73 |
| 2026-02-16 00:00 |
05:47:56.54 |
+31:47:53.1 |
HIP 27538 |
25.30 |
| 2026-02-16 12:00 |
05:47:53.88 |
+31:47:36.8 |
HIP 27538 |
25.85 |
| 2026-02-17 00:00 |
05:47:51.27 |
+31:47:20.5 |
HIP 27538 |
26.41 |
| 2026-02-17 12:00 |
05:47:48.70 |
+31:47:04.2 |
HIP 27538 |
26.95 |
| 2026-02-18 00:00 |
05:47:46.16 |
+31:46:47.8 |
HIP 27538 |
27.50 |
| 2026-02-18 12:00 |
05:47:43.67 |
+31:46:31.4 |
HIP 27538 |
28.03 |
| 2026-02-19 00:00 |
05:47:41.21 |
+31:46:15.0 |
HIP 27538 |
28.56 |
| 2026-02-19 12:00 |
05:47:38.80 |
+31:45:58.6 |
HIP 27538 |
29.08 |
| 2026-02-20 00:00 |
05:47:36.42 |
+31:45:42.2 |
HIP 27538 |
29.60 |
| 2026-02-20 12:00 |
05:47:34.09 |
+31:45:25.7 |
HIP 27538 |
30.11 |
| 2026-02-21 00:00 |
05:47:31.80 |
+31:45:09.3 |
HIP 27538 |
30.61 |
| 2026-02-21 12:00 |
05:47:29.55 |
+31:44:52.8 |
HIP 27538 |
31.11 |
| 2026-02-22 00:00 |
05:47:27.34 |
+31:44:36.3 |
HIP 27538 |
31.60 |
| 2026-02-22 12:00 |
05:47:25.17 |
+31:44:19.8 |
HIP 27538 |
32.09 |
| 2026-02-23 00:00 |
05:47:23.04 |
+31:44:03.3 |
HIP 27538 |
32.56 |
| 2026-02-23 12:00 |
05:47:20.95 |
+31:43:46.7 |
HIP 27538 |
33.03 |
| 2026-02-24 00:00 |
05:47:18.90 |
+31:43:30.2 |
HIP 27164 |
33.45 |