| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
18:38:01.33 |
-11:27:00.0 |
HIP 91340 |
6.43 |
| 2026-06-03 00:00 |
18:37:45.62 |
-11:26:43.2 |
HIP 91340 |
5.51 |
| 2026-06-03 12:00 |
18:37:29.81 |
-11:26:26.9 |
HIP 91340 |
7.04 |
| 2026-06-04 00:00 |
18:37:13.90 |
-11:26:11.1 |
HIP 91340 |
9.97 |
| 2026-06-04 12:00 |
18:36:57.89 |
-11:25:55.9 |
HIP 91340 |
13.43 |
| 2026-06-05 00:00 |
18:36:41.79 |
-11:25:41.2 |
HIP 91340 |
17.13 |
| 2026-06-05 12:00 |
18:36:25.59 |
-11:25:27.0 |
HIP 91340 |
20.94 |
| 2026-06-06 00:00 |
18:36:09.30 |
-11:25:13.3 |
HIP 91340 |
24.83 |
| 2026-06-06 12:00 |
18:35:52.93 |
-11:25:00.2 |
HIP 91340 |
28.77 |
| 2026-06-07 00:00 |
18:35:36.47 |
-11:24:47.6 |
HIP 91105 |
27.47 |
| 2026-06-07 12:00 |
18:35:19.92 |
-11:24:35.5 |
HIP 91105 |
26.32 |
| 2026-06-08 00:00 |
18:35:03.29 |
-11:24:24.0 |
HIP 91105 |
25.77 |
| 2026-06-08 12:00 |
18:34:46.58 |
-11:24:13.0 |
HIP 90979 |
23.55 |
| 2026-06-09 00:00 |
18:34:29.78 |
-11:24:02.6 |
HIP 90979 |
20.50 |
| 2026-06-09 12:00 |
18:34:12.92 |
-11:23:52.7 |
HIP 90979 |
17.85 |
| 2026-06-10 00:00 |
18:33:55.97 |
-11:23:43.3 |
HIP 90979 |
15.85 |
| 2026-06-10 12:00 |
18:33:38.96 |
-11:23:34.5 |
HIP 90979 |
14.76 |
| 2026-06-11 00:00 |
18:33:21.87 |
-11:23:26.2 |
HIP 90979 |
14.79 |
| 2026-06-11 12:00 |
18:33:04.71 |
-11:23:18.5 |
HIP 90979 |
15.97 |
| 2026-06-12 00:00 |
18:32:47.49 |
-11:23:11.3 |
HIP 90979 |
18.07 |
| 2026-06-12 12:00 |
18:32:30.20 |
-11:23:04.7 |
HIP 90849 |
17.52 |
| 2026-06-13 00:00 |
18:32:12.86 |
-11:22:58.6 |
HIP 90849 |
16.29 |
| 2026-06-13 12:00 |
18:31:55.45 |
-11:22:53.0 |
HIP 90849 |
16.11 |
| 2026-06-14 00:00 |
18:31:37.98 |
-11:22:48.0 |
HIP 90849 |
17.03 |
| 2026-06-14 12:00 |
18:31:20.46 |
-11:22:43.5 |
HIP 90849 |
18.90 |
| 2026-06-15 00:00 |
18:31:02.89 |
-11:22:39.6 |
HIP 90849 |
21.47 |
| 2026-06-15 12:00 |
18:30:45.27 |
-11:22:36.2 |
HIP 90849 |
24.54 |
| 2026-06-16 00:00 |
18:30:27.60 |
-11:22:33.4 |
HIP 90849 |
27.95 |
| 2026-06-16 12:00 |
18:30:09.88 |
-11:22:31.1 |
HIP 90717 |
31.17 |
| 2026-06-17 00:00 |
18:29:52.12 |
-11:22:29.4 |
HIP 90717 |
32.19 |
| 2026-06-17 12:00 |
18:29:34.32 |
-11:22:28.2 |
HIP 90717 |
33.77 |
| 2026-06-18 00:00 |
18:29:16.49 |
-11:22:27.5 |
HIP 90717 |
35.82 |
| 2026-06-18 12:00 |
18:28:58.61 |
-11:22:27.4 |
HIP 90402 |
33.34 |
| 2026-06-19 00:00 |
18:28:40.71 |
-11:22:27.8 |
HIP 90402 |
28.95 |
| 2026-06-19 12:00 |
18:28:22.78 |
-11:22:28.8 |
HIP 90402 |
24.56 |
| 2026-06-20 00:00 |
18:28:04.81 |
-11:22:30.3 |
HIP 90402 |
20.17 |
| 2026-06-20 12:00 |
18:27:46.82 |
-11:22:32.3 |
HIP 90402 |
15.77 |
| 2026-06-21 00:00 |
18:27:28.81 |
-11:22:34.9 |
HIP 90402 |
11.37 |
| 2026-06-21 12:00 |
18:27:10.78 |
-11:22:38.0 |
HIP 90402 |
7.00 |
| 2026-06-22 00:00 |
18:26:52.73 |
-11:22:41.6 |
HIP 90402 |
2.78 |