| Parameter |
Value |
| Designation |
207P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-01-31T21:10:31.765440Z |
| Orbit solution date (soln_date, UTC) |
2024-07-13T19:12:21Z |
| Obs used |
945 |
| NEO |
Yes |
| M1 |
18.100 |
| K1 |
7.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-09-21.0000000 |
| e |
0.75913663 |
| q (au) |
0.932526 |
| a (au) |
3.871595 |
| i (deg) |
10.186368 |
| Ω (om, deg) |
198.342590 |
| ω (w, deg) |
272.996482 |
| M (ma, deg) |
248.359775 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.808 + 4.847\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.808 |
| n |
4.847 |
| gf |
1.000 |
| gb |
-0.660 |
| k |
0.889 |
| 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 |
| 2023-08-14 |
2023-11-08 |
-7.5789 |
+2.111 |
| 2023-11-08 |
2023-11-27 |
+6.0464 |
-0.368 |
| 2023-11-27 |
2024-01-31 |
+9.0520 |
-0.573 |
| 2024-02-01 |
2024-03-24 |
-1.1487 |
+0.236 |
| 2024-03-24 |
2024-05-03 |
-7.4634 |
+0.253 |
| 2024-05-03 |
2024-05-29 |
+14.8610 |
-4.201 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
17:57:31.95 |
-13:10:25.3 |
HIP 88010 |
16.92 |
| 2026-09-20 12:00 |
17:57:35.68 |
-13:11:12.6 |
HIP 88010 |
16.30 |
| 2026-09-21 00:00 |
17:57:39.57 |
-13:11:59.8 |
HIP 88010 |
15.71 |
| 2026-09-21 12:00 |
17:57:43.61 |
-13:12:46.8 |
HIP 88010 |
15.16 |
| 2026-09-22 00:00 |
17:57:47.80 |
-13:13:33.8 |
HIP 88010 |
14.67 |
| 2026-09-22 12:00 |
17:57:52.14 |
-13:14:20.6 |
HIP 88010 |
14.25 |
| 2026-09-23 00:00 |
17:57:56.64 |
-13:15:07.2 |
HIP 88010 |
13.90 |
| 2026-09-23 12:00 |
17:58:01.28 |
-13:15:53.8 |
HIP 88010 |
13.66 |
| 2026-09-24 00:00 |
17:58:06.08 |
-13:16:40.1 |
HIP 88010 |
13.53 |
| 2026-09-24 12:00 |
17:58:11.02 |
-13:17:26.4 |
HIP 88010 |
13.52 |
| 2026-09-25 00:00 |
17:58:16.12 |
-13:18:12.5 |
HIP 88010 |
13.65 |
| 2026-09-25 12:00 |
17:58:21.36 |
-13:18:58.4 |
HIP 88010 |
13.91 |
| 2026-09-26 00:00 |
17:58:26.75 |
-13:19:44.2 |
HIP 88010 |
14.32 |
| 2026-09-26 12:00 |
17:58:32.28 |
-13:20:29.9 |
HIP 88010 |
14.86 |
| 2026-09-27 00:00 |
17:58:37.96 |
-13:21:15.4 |
HIP 88010 |
15.54 |
| 2026-09-27 12:00 |
17:58:43.79 |
-13:22:00.7 |
HIP 88010 |
16.34 |
| 2026-09-28 00:00 |
17:58:49.76 |
-13:22:45.9 |
HIP 88010 |
17.25 |
| 2026-09-28 12:00 |
17:58:55.88 |
-13:23:30.9 |
HIP 88010 |
18.28 |
| 2026-09-29 00:00 |
17:59:02.14 |
-13:24:15.7 |
HIP 88010 |
19.40 |
| 2026-09-29 12:00 |
17:59:08.54 |
-13:25:00.4 |
HIP 88010 |
20.60 |
| 2026-09-30 00:00 |
17:59:15.08 |
-13:25:44.8 |
HIP 88010 |
21.89 |
| 2026-09-30 12:00 |
17:59:21.77 |
-13:26:29.1 |
HIP 88010 |
23.26 |
| 2026-10-01 00:00 |
17:59:28.60 |
-13:27:13.3 |
HIP 88010 |
24.69 |
| 2026-10-01 12:00 |
17:59:35.57 |
-13:27:57.2 |
HIP 88201 |
25.08 |
| 2026-10-02 00:00 |
17:59:42.67 |
-13:28:40.9 |
HIP 88201 |
23.40 |
| 2026-10-02 12:00 |
17:59:49.92 |
-13:29:24.5 |
HIP 88201 |
21.75 |
| 2026-10-03 00:00 |
17:59:57.31 |
-13:30:07.9 |
HIP 88201 |
20.12 |
| 2026-10-03 12:00 |
18:00:04.83 |
-13:30:51.0 |
HIP 88201 |
18.53 |
| 2026-10-04 00:00 |
18:00:12.49 |
-13:31:34.0 |
HIP 88201 |
17.02 |
| 2026-10-04 12:00 |
18:00:20.29 |
-13:32:16.7 |
HIP 88201 |
15.60 |
| 2026-10-05 00:00 |
18:00:28.23 |
-13:32:59.3 |
HIP 88201 |
14.32 |
| 2026-10-05 12:00 |
18:00:36.30 |
-13:33:41.6 |
HIP 88201 |
13.24 |
| 2026-10-06 00:00 |
18:00:44.51 |
-13:34:23.7 |
HIP 88201 |
12.42 |
| 2026-10-06 12:00 |
18:00:52.85 |
-13:35:05.6 |
HIP 88201 |
11.93 |
| 2026-10-07 00:00 |
18:01:01.32 |
-13:35:47.3 |
HIP 88201 |
11.83 |
| 2026-10-07 12:00 |
18:01:09.93 |
-13:36:28.8 |
HIP 88201 |
12.15 |
| 2026-10-08 00:00 |
18:01:18.67 |
-13:37:10.0 |
HIP 88201 |
12.87 |
| 2026-10-08 12:00 |
18:01:27.55 |
-13:37:51.0 |
HIP 88201 |
13.94 |
| 2026-10-09 00:00 |
18:01:36.55 |
-13:38:31.8 |
HIP 88201 |
15.30 |
| 2026-10-09 12:00 |
18:01:45.68 |
-13:39:12.3 |
HIP 88201 |
16.89 |
| 2026-10-10 00:00 |
18:01:54.95 |
-13:39:52.6 |
HIP 88201 |
18.67 |
| 2026-10-10 12:00 |
18:02:04.34 |
-13:40:32.6 |
HIP 88201 |
20.59 |
| 2026-10-11 00:00 |
18:02:13.86 |
-13:41:12.4 |
HIP 88201 |
22.63 |