| Parameter |
Value |
| Designation |
473P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2001-11-04T17:20:30.220800Z |
| Orbit solution date (soln_date, UTC) |
2024-06-30T00:42:21Z |
| Obs used |
520 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
25.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-08-01.0000000 |
| e |
0.82249544 |
| q (au) |
1.407115 |
| a (au) |
7.927206 |
| i (deg) |
56.948538 |
| Ω (om, deg) |
22.184978 |
| ω (w, deg) |
43.106501 |
| M (ma, deg) |
108.688703 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.080 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.080 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2023-11-29 |
2024-05-08 |
+16.9214 |
-4.614 |
| 2024-05-08 |
2024-06-25 |
-14.5858 |
+3.980 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
13:34:55.06 |
-12:00:08.8 |
HIP 66216 |
29.36 |
| 2026-03-26 12:00 |
13:34:37.75 |
-11:59:37.3 |
HIP 66216 |
27.82 |
| 2026-03-27 00:00 |
13:34:20.39 |
-11:59:05.3 |
HIP 66216 |
26.86 |
| 2026-03-27 12:00 |
13:34:02.97 |
-11:58:32.9 |
HIP 66216 |
26.57 |
| 2026-03-28 00:00 |
13:33:45.50 |
-11:58:00.0 |
HIP 66216 |
26.96 |
| 2026-03-28 12:00 |
13:33:27.98 |
-11:57:26.7 |
HIP 66216 |
28.01 |
| 2026-03-29 00:00 |
13:33:10.42 |
-11:56:52.9 |
HIP 66216 |
29.67 |
| 2026-03-29 12:00 |
13:32:52.81 |
-11:56:18.6 |
HIP 66216 |
31.83 |
| 2026-03-30 00:00 |
13:32:35.15 |
-11:55:43.9 |
HIP 66216 |
34.42 |
| 2026-03-30 12:00 |
13:32:17.45 |
-11:55:08.8 |
HIP 66216 |
37.34 |
| 2026-03-31 00:00 |
13:31:59.71 |
-11:54:33.3 |
HIP 66018 |
39.20 |
| 2026-03-31 12:00 |
13:31:41.94 |
-11:53:57.4 |
HIP 65849 |
35.68 |
| 2026-04-01 00:00 |
13:31:24.13 |
-11:53:21.1 |
HIP 65849 |
32.16 |
| 2026-04-01 12:00 |
13:31:06.28 |
-11:52:44.4 |
HIP 65849 |
28.88 |
| 2026-04-02 00:00 |
13:30:48.40 |
-11:52:07.3 |
HIP 65849 |
25.92 |
| 2026-04-02 12:00 |
13:30:30.50 |
-11:51:29.9 |
HIP 65849 |
23.43 |
| 2026-04-03 00:00 |
13:30:12.57 |
-11:50:52.1 |
HIP 65849 |
21.55 |
| 2026-04-03 12:00 |
13:29:54.61 |
-11:50:13.9 |
HIP 65849 |
20.47 |
| 2026-04-04 00:00 |
13:29:36.62 |
-11:49:35.4 |
HIP 65849 |
20.33 |
| 2026-04-04 12:00 |
13:29:18.62 |
-11:48:56.5 |
HIP 65849 |
21.14 |
| 2026-04-05 00:00 |
13:29:00.60 |
-11:48:17.3 |
HIP 65849 |
22.80 |
| 2026-04-05 12:00 |
13:28:42.56 |
-11:47:37.8 |
HIP 65849 |
25.16 |
| 2026-04-06 00:00 |
13:28:24.50 |
-11:46:58.0 |
HIP 65849 |
28.03 |
| 2026-04-06 12:00 |
13:28:06.43 |
-11:46:17.9 |
HIP 65849 |
31.28 |
| 2026-04-07 00:00 |
13:27:48.35 |
-11:45:37.5 |
HIP 65849 |
34.80 |
| 2026-04-07 12:00 |
13:27:30.26 |
-11:44:56.8 |
HIP 65849 |
38.53 |
| 2026-04-08 00:00 |
13:27:12.17 |
-11:44:15.8 |
HIP 65849 |
42.40 |
| 2026-04-08 12:00 |
13:26:54.07 |
-11:43:34.6 |
HIP 65474 |
42.19 |
| 2026-04-09 00:00 |
13:26:35.96 |
-11:42:53.1 |
HIP 65474 |
39.12 |
| 2026-04-09 12:00 |
13:26:17.86 |
-11:42:11.4 |
HIP 65474 |
36.34 |
| 2026-04-10 00:00 |
13:25:59.76 |
-11:41:29.4 |
HIP 65474 |
33.93 |
| 2026-04-10 12:00 |
13:25:41.66 |
-11:40:47.3 |
HIP 65474 |
31.97 |
| 2026-04-11 00:00 |
13:25:23.57 |
-11:40:04.9 |
HIP 65474 |
30.55 |
| 2026-04-11 12:00 |
13:25:05.48 |
-11:39:22.3 |
HIP 65474 |
29.73 |
| 2026-04-12 00:00 |
13:24:47.41 |
-11:38:39.5 |
HIP 65474 |
29.58 |
| 2026-04-12 12:00 |
13:24:29.34 |
-11:37:56.5 |
HIP 65474 |
30.10 |
| 2026-04-13 00:00 |
13:24:11.30 |
-11:37:13.3 |
HIP 65474 |
31.26 |
| 2026-04-13 12:00 |
13:23:53.26 |
-11:36:30.0 |
HIP 65474 |
32.99 |
| 2026-04-14 00:00 |
13:23:35.25 |
-11:35:46.6 |
HIP 65191 |
30.72 |
| 2026-04-14 12:00 |
13:23:17.26 |
-11:35:03.0 |
HIP 65191 |
26.80 |
| 2026-04-15 00:00 |
13:22:59.29 |
-11:34:19.2 |
HIP 65191 |
23.08 |
| 2026-04-15 12:00 |
13:22:41.34 |
-11:33:35.4 |
HIP 65191 |
19.68 |
| 2026-04-16 00:00 |
13:22:23.43 |
-11:32:51.4 |
HIP 65191 |
16.79 |