461P/WISE
| Parameter |
Value |
| Designation |
461P/WISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-10-05T00:29:50.389440Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:43:14Z |
| Obs used |
756 |
| NEO |
- |
| M1 |
17.400 |
| K1 |
14.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2010-07-28T09:12:17.856000Z |
| Discovery magnitude (MPC) |
20.40 C |
| Discovery observatory (MPC) |
H36 · Sandlot Observatory, Scranton |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-04-09.0000000 |
| e |
0.57036034 |
| q (au) |
1.348581 |
| a (au) |
3.138866 |
| i (deg) |
18.412131 |
| Ω (om, deg) |
194.400261 |
| ω (w, deg) |
174.777098 |
| M (ma, deg) |
263.581492 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.224 + 4.041\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.224 |
| n |
4.041 |
| gf |
0.881 |
| gb |
-0.772 |
| k |
0.976 |
| δ90 |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2021-06-06 |
2021-10-04 |
+0.8293 |
+0.008 |
| 2021-10-05 |
2021-12-09 |
-0.0541 |
-0.085 |
| 2021-12-09 |
2022-01-28 |
-2.6927 |
+0.258 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
16:08:05.52 |
-10:56:54.4 |
HIP 79135 |
15.69 |
| 2026-02-03 12:00 |
16:08:29.34 |
-10:56:09.6 |
HIP 79135 |
9.85 |
| 2026-02-04 00:00 |
16:08:53.03 |
-10:55:23.6 |
HIP 79135 |
4.20 |
| 2026-02-04 12:00 |
16:09:16.59 |
-10:54:36.3 |
HIP 79135 |
2.67 |
| 2026-02-05 00:00 |
16:09:40.01 |
-10:53:47.9 |
HIP 79135 |
8.02 |
| 2026-02-05 12:00 |
16:10:03.30 |
-10:52:58.1 |
HIP 79135 |
13.72 |
| 2026-02-06 00:00 |
16:10:26.45 |
-10:52:07.1 |
HIP 79196 |
18.07 |
| 2026-02-06 12:00 |
16:10:49.45 |
-10:51:14.9 |
HIP 79371 |
21.64 |
| 2026-02-07 00:00 |
16:11:12.32 |
-10:50:21.4 |
HIP 79371 |
17.02 |
| 2026-02-07 12:00 |
16:11:35.05 |
-10:49:26.7 |
HIP 79371 |
13.25 |
| 2026-02-08 00:00 |
16:11:57.63 |
-10:48:30.7 |
HIP 79371 |
11.18 |
| 2026-02-08 12:00 |
16:12:20.07 |
-10:47:33.5 |
HIP 79371 |
11.69 |
| 2026-02-09 00:00 |
16:12:42.36 |
-10:46:35.0 |
HIP 79371 |
14.49 |
| 2026-02-09 12:00 |
16:13:04.50 |
-10:45:35.2 |
HIP 79371 |
18.53 |
| 2026-02-10 00:00 |
16:13:26.49 |
-10:44:34.2 |
HIP 79416 |
21.20 |
| 2026-02-10 12:00 |
16:13:48.33 |
-10:43:31.8 |
HIP 79588 |
19.91 |
| 2026-02-11 00:00 |
16:14:10.02 |
-10:42:28.2 |
HIP 79588 |
17.68 |
| 2026-02-11 12:00 |
16:14:31.55 |
-10:41:23.4 |
HIP 79588 |
16.93 |
| 2026-02-12 00:00 |
16:14:52.93 |
-10:40:17.2 |
HIP 79588 |
17.83 |
| 2026-02-12 12:00 |
16:15:14.14 |
-10:39:09.8 |
HIP 79588 |
20.12 |
| 2026-02-13 00:00 |
16:15:35.20 |
-10:38:01.0 |
HIP 79588 |
23.39 |
| 2026-02-13 12:00 |
16:15:56.10 |
-10:36:51.0 |
HIP 79663 |
27.07 |
| 2026-02-14 00:00 |
16:16:16.83 |
-10:35:39.7 |
HIP 79749 |
24.75 |
| 2026-02-14 12:00 |
16:16:37.40 |
-10:34:27.1 |
HIP 79749 |
23.08 |
| 2026-02-15 00:00 |
16:16:57.80 |
-10:33:13.2 |
HIP 79749 |
22.48 |
| 2026-02-15 12:00 |
16:17:18.03 |
-10:31:58.0 |
HIP 79749 |
23.02 |
| 2026-02-16 00:00 |
16:17:38.10 |
-10:30:41.5 |
HIP 79928 |
24.08 |
| 2026-02-16 12:00 |
16:17:57.99 |
-10:29:23.7 |
HIP 79928 |
21.83 |
| 2026-02-17 00:00 |
16:18:17.71 |
-10:28:04.6 |
HIP 79928 |
20.63 |
| 2026-02-17 12:00 |
16:18:37.25 |
-10:26:44.2 |
HIP 79928 |
20.65 |
| 2026-02-18 00:00 |
16:18:56.62 |
-10:25:22.5 |
HIP 79928 |
21.86 |
| 2026-02-18 12:00 |
16:19:15.81 |
-10:23:59.5 |
HIP 79928 |
24.05 |
| 2026-02-19 00:00 |
16:19:34.82 |
-10:22:35.2 |
HIP 79928 |
26.97 |
| 2026-02-19 12:00 |
16:19:53.65 |
-10:21:09.6 |
HIP 80159 |
29.10 |
| 2026-02-20 00:00 |
16:20:12.30 |
-10:19:42.6 |
HIP 80159 |
24.30 |
| 2026-02-20 12:00 |
16:20:30.76 |
-10:18:14.4 |
HIP 80159 |
19.53 |
| 2026-02-21 00:00 |
16:20:49.03 |
-10:16:44.8 |
HIP 80159 |
14.80 |
| 2026-02-21 12:00 |
16:21:07.12 |
-10:15:13.9 |
HIP 80159 |
10.11 |
| 2026-02-22 00:00 |
16:21:25.03 |
-10:13:41.7 |
HIP 80159 |
5.48 |
| 2026-02-22 12:00 |
16:21:42.74 |
-10:12:08.2 |
HIP 80159 |
1.09 |
| 2026-02-23 00:00 |
16:22:00.26 |
-10:10:33.4 |
HIP 80159 |
3.86 |
| 2026-02-23 12:00 |
16:22:17.58 |
-10:08:57.3 |
HIP 80159 |
8.37 |
| 2026-02-24 00:00 |
16:22:34.71 |
-10:07:19.9 |
HIP 80159 |
12.88 |