| 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 |
-7.5803 |
+2.112 |
| 2023-11-08 |
2023-11-27 |
+6.0478 |
-0.368 |
| 2023-11-27 |
2024-01-31 |
+9.0520 |
-0.573 |
| 2024-02-01 |
2024-03-24 |
-1.1469 |
+0.236 |
| 2024-03-24 |
2024-05-03 |
-7.4646 |
+0.253 |
| 2024-05-03 |
2024-05-29 |
+14.8588 |
-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) |
| 2026-05-12 00:00 |
18:47:19.27 |
-11:46:58.8 |
HIP 92272 |
27.79 |
| 2026-05-12 12:00 |
18:47:09.34 |
-11:46:21.0 |
HIP 92272 |
28.67 |
| 2026-05-13 00:00 |
18:46:59.26 |
-11:45:43.6 |
HIP 92272 |
29.76 |
| 2026-05-13 12:00 |
18:46:49.01 |
-11:45:06.7 |
HIP 92272 |
31.05 |
| 2026-05-14 00:00 |
18:46:38.60 |
-11:44:30.2 |
HIP 92000 |
28.79 |
| 2026-05-14 12:00 |
18:46:28.03 |
-11:43:54.2 |
HIP 92000 |
26.38 |
| 2026-05-15 00:00 |
18:46:17.31 |
-11:43:18.6 |
HIP 92000 |
23.99 |
| 2026-05-15 12:00 |
18:46:06.42 |
-11:42:43.4 |
HIP 92000 |
21.66 |
| 2026-05-16 00:00 |
18:45:55.38 |
-11:42:08.7 |
HIP 92000 |
19.41 |
| 2026-05-16 12:00 |
18:45:44.19 |
-11:41:34.5 |
HIP 92000 |
17.29 |
| 2026-05-17 00:00 |
18:45:32.84 |
-11:41:00.7 |
HIP 92000 |
15.39 |
| 2026-05-17 12:00 |
18:45:21.34 |
-11:40:27.4 |
HIP 92000 |
13.80 |
| 2026-05-18 00:00 |
18:45:09.69 |
-11:39:54.6 |
HIP 92000 |
12.68 |
| 2026-05-18 12:00 |
18:44:57.89 |
-11:39:22.2 |
HIP 92000 |
12.17 |
| 2026-05-19 00:00 |
18:44:45.94 |
-11:38:50.3 |
HIP 92000 |
12.39 |
| 2026-05-19 12:00 |
18:44:33.85 |
-11:38:18.9 |
HIP 92000 |
13.31 |
| 2026-05-20 00:00 |
18:44:21.60 |
-11:37:47.9 |
HIP 92000 |
14.83 |
| 2026-05-20 12:00 |
18:44:09.22 |
-11:37:17.5 |
HIP 92000 |
16.80 |
| 2026-05-21 00:00 |
18:43:56.69 |
-11:36:47.5 |
HIP 91847 |
17.67 |
| 2026-05-21 12:00 |
18:43:44.01 |
-11:36:18.0 |
HIP 91847 |
16.36 |
| 2026-05-22 00:00 |
18:43:31.20 |
-11:35:49.0 |
HIP 91847 |
15.60 |
| 2026-05-22 12:00 |
18:43:18.25 |
-11:35:20.5 |
HIP 91847 |
15.47 |
| 2026-05-23 00:00 |
18:43:05.16 |
-11:34:52.4 |
HIP 91847 |
16.02 |
| 2026-05-23 12:00 |
18:42:51.94 |
-11:34:24.9 |
HIP 91847 |
17.21 |
| 2026-05-24 00:00 |
18:42:38.58 |
-11:33:57.8 |
HIP 91847 |
18.92 |
| 2026-05-24 12:00 |
18:42:25.09 |
-11:33:31.3 |
HIP 91748 |
20.67 |
| 2026-05-25 00:00 |
18:42:11.47 |
-11:33:05.2 |
HIP 91748 |
21.70 |
| 2026-05-25 12:00 |
18:41:57.72 |
-11:32:39.7 |
HIP 91748 |
23.17 |
| 2026-05-26 00:00 |
18:41:43.84 |
-11:32:14.6 |
HIP 91748 |
25.03 |
| 2026-05-26 12:00 |
18:41:29.83 |
-11:31:50.1 |
HIP 91748 |
27.21 |
| 2026-05-27 00:00 |
18:41:15.70 |
-11:31:26.1 |
HIP 91748 |
29.64 |
| 2026-05-27 12:00 |
18:41:01.44 |
-11:31:02.5 |
HIP 91530 |
29.32 |
| 2026-05-28 00:00 |
18:40:47.07 |
-11:30:39.5 |
HIP 91530 |
27.22 |
| 2026-05-28 12:00 |
18:40:32.57 |
-11:30:17.0 |
HIP 91530 |
25.45 |
| 2026-05-29 00:00 |
18:40:17.95 |
-11:29:55.0 |
HIP 91530 |
24.08 |
| 2026-05-29 12:00 |
18:40:03.22 |
-11:29:33.5 |
HIP 91530 |
23.20 |
| 2026-05-30 00:00 |
18:39:48.37 |
-11:29:12.5 |
HIP 91530 |
22.87 |
| 2026-05-30 12:00 |
18:39:33.41 |
-11:28:52.0 |
HIP 91530 |
23.15 |
| 2026-05-31 00:00 |
18:39:18.33 |
-11:28:32.0 |
HIP 91340 |
22.99 |
| 2026-05-31 12:00 |
18:39:03.15 |
-11:28:12.6 |
HIP 91340 |
19.37 |
| 2026-06-01 00:00 |
18:38:47.85 |
-11:27:53.7 |
HIP 91340 |
15.79 |
| 2026-06-01 12:00 |
18:38:32.45 |
-11:27:35.3 |
HIP 91340 |
12.31 |
| 2026-06-02 00:00 |
18:38:16.94 |
-11:27:17.4 |
HIP 91340 |
9.05 |