C/2005 O1 (NEAT)
| Parameter |
Value |
| Designation |
C/2005 O1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-05-17T08:50:22.372800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:51Z |
| Obs used |
90 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
17.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-08-12.0000000 |
| e |
0.92959218 |
| q (au) |
3.590926 |
| a (au) |
51.001801 |
| i (deg) |
155.981032 |
| Ω (om, deg) |
304.799007 |
| ω (w, deg) |
324.741971 |
| M (ma, deg) |
0.234424 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.819 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.819 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.760 |
| 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 |
13:09:30.84 |
+16:25:57.9 |
HIP 64228 |
5.04 |
| 2026-02-03 12:00 |
13:09:29.17 |
+16:26:25.4 |
HIP 64228 |
5.16 |
| 2026-02-04 00:00 |
13:09:27.48 |
+16:26:53.0 |
HIP 64228 |
5.36 |
| 2026-02-04 12:00 |
13:09:25.76 |
+16:27:20.6 |
HIP 64228 |
5.63 |
| 2026-02-05 00:00 |
13:09:24.01 |
+16:27:48.3 |
HIP 64228 |
5.95 |
| 2026-02-05 12:00 |
13:09:22.24 |
+16:28:16.0 |
HIP 64228 |
6.32 |
| 2026-02-06 00:00 |
13:09:20.44 |
+16:28:43.8 |
HIP 64228 |
6.74 |
| 2026-02-06 12:00 |
13:09:18.62 |
+16:29:11.7 |
HIP 64228 |
7.20 |
| 2026-02-07 00:00 |
13:09:16.77 |
+16:29:39.6 |
HIP 64228 |
7.68 |
| 2026-02-07 12:00 |
13:09:14.89 |
+16:30:07.6 |
HIP 64228 |
8.20 |
| 2026-02-08 00:00 |
13:09:12.99 |
+16:30:35.6 |
HIP 64140 |
8.05 |
| 2026-02-08 12:00 |
13:09:11.06 |
+16:31:03.7 |
HIP 64140 |
7.43 |
| 2026-02-09 00:00 |
13:09:09.10 |
+16:31:31.9 |
HIP 64140 |
6.81 |
| 2026-02-09 12:00 |
13:09:07.12 |
+16:32:00.1 |
HIP 64140 |
6.19 |
| 2026-02-10 00:00 |
13:09:05.12 |
+16:32:28.3 |
HIP 64140 |
5.58 |
| 2026-02-10 12:00 |
13:09:03.08 |
+16:32:56.6 |
HIP 64140 |
4.98 |
| 2026-02-11 00:00 |
13:09:01.03 |
+16:33:24.9 |
HIP 64140 |
4.39 |
| 2026-02-11 12:00 |
13:08:58.94 |
+16:33:53.2 |
HIP 64140 |
3.83 |
| 2026-02-12 00:00 |
13:08:56.84 |
+16:34:21.6 |
HIP 64140 |
3.30 |
| 2026-02-12 12:00 |
13:08:54.71 |
+16:34:50.1 |
HIP 64140 |
2.85 |
| 2026-02-13 00:00 |
13:08:52.55 |
+16:35:18.5 |
HIP 64140 |
2.50 |
| 2026-02-13 12:00 |
13:08:50.37 |
+16:35:47.0 |
HIP 64140 |
2.32 |
| 2026-02-14 00:00 |
13:08:48.16 |
+16:36:15.5 |
HIP 64140 |
2.34 |
| 2026-02-14 12:00 |
13:08:45.93 |
+16:36:44.1 |
HIP 64140 |
2.57 |
| 2026-02-15 00:00 |
13:08:43.68 |
+16:37:12.6 |
HIP 64140 |
2.95 |
| 2026-02-15 12:00 |
13:08:41.40 |
+16:37:41.2 |
HIP 64140 |
3.45 |
| 2026-02-16 00:00 |
13:08:39.10 |
+16:38:09.8 |
HIP 64140 |
4.02 |
| 2026-02-16 12:00 |
13:08:36.77 |
+16:38:38.4 |
HIP 64140 |
4.63 |
| 2026-02-17 00:00 |
13:08:34.42 |
+16:39:07.0 |
HIP 64140 |
5.28 |
| 2026-02-17 12:00 |
13:08:32.05 |
+16:39:35.7 |
HIP 64140 |
5.95 |
| 2026-02-18 00:00 |
13:08:29.66 |
+16:40:04.3 |
HIP 64140 |
6.64 |
| 2026-02-18 12:00 |
13:08:27.24 |
+16:40:33.0 |
HIP 64140 |
7.34 |
| 2026-02-19 00:00 |
13:08:24.80 |
+16:41:01.6 |
HIP 64140 |
8.06 |
| 2026-02-19 12:00 |
13:08:22.33 |
+16:41:30.3 |
HIP 64140 |
8.78 |
| 2026-02-20 00:00 |
13:08:19.84 |
+16:41:58.9 |
HIP 64140 |
9.52 |
| 2026-02-20 12:00 |
13:08:17.34 |
+16:42:27.6 |
HIP 64140 |
10.26 |
| 2026-02-21 00:00 |
13:08:14.81 |
+16:42:56.2 |
HIP 64140 |
11.00 |
| 2026-02-21 12:00 |
13:08:12.25 |
+16:43:24.8 |
HIP 64140 |
11.76 |
| 2026-02-22 00:00 |
13:08:09.68 |
+16:43:53.4 |
HIP 64140 |
12.52 |
| 2026-02-22 12:00 |
13:08:07.08 |
+16:44:22.0 |
HIP 64140 |
13.28 |
| 2026-02-23 00:00 |
13:08:04.47 |
+16:44:50.6 |
HIP 64140 |
14.05 |
| 2026-02-23 12:00 |
13:08:01.83 |
+16:45:19.2 |
HIP 64113 |
14.11 |
| 2026-02-24 00:00 |
13:07:59.17 |
+16:45:47.7 |
HIP 64113 |
13.95 |