395P/Catalina-NEAT
| Parameter |
Value |
| Designation |
395P/Catalina-NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-12-30T11:54:17.147520Z |
| Orbit solution date (soln_date, UTC) |
2025-04-09T14:01:13Z |
| Obs used |
810 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-03-31.0000000 |
| e |
0.38213832 |
| q (au) |
4.064893 |
| a (au) |
6.578970 |
| i (deg) |
3.276962 |
| Ω (om, deg) |
223.549119 |
| ω (w, deg) |
89.966129 |
| M (ma, deg) |
5.286093 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.462 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.462 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.762 |
| 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 |
| 2020-04-26 |
2021-11-28 |
+16.3019 |
-9.562 |
| 2022-06-06 |
2023-10-18 |
+22.4213 |
-14.528 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
04:59:20.22 |
+20:09:07.9 |
HIP 23191 |
2.82 |
| 2026-02-03 12:00 |
04:59:16.54 |
+20:09:08.0 |
HIP 23191 |
3.30 |
| 2026-02-04 00:00 |
04:59:13.00 |
+20:09:08.3 |
HIP 23191 |
3.89 |
| 2026-02-04 12:00 |
04:59:09.60 |
+20:09:08.9 |
HIP 23191 |
4.52 |
| 2026-02-05 00:00 |
04:59:06.35 |
+20:09:09.7 |
HIP 23191 |
5.17 |
| 2026-02-05 12:00 |
04:59:03.24 |
+20:09:10.8 |
HIP 23191 |
5.81 |
| 2026-02-06 00:00 |
04:59:00.27 |
+20:09:12.1 |
HIP 23191 |
6.44 |
| 2026-02-06 12:00 |
04:58:57.45 |
+20:09:13.6 |
HIP 23191 |
7.05 |
| 2026-02-07 00:00 |
04:58:54.77 |
+20:09:15.4 |
HIP 23191 |
7.63 |
| 2026-02-07 12:00 |
04:58:52.23 |
+20:09:17.4 |
HIP 23191 |
8.19 |
| 2026-02-08 00:00 |
04:58:49.84 |
+20:09:19.7 |
HIP 23191 |
8.72 |
| 2026-02-08 12:00 |
04:58:47.59 |
+20:09:22.3 |
HIP 23191 |
9.22 |
| 2026-02-09 00:00 |
04:58:45.49 |
+20:09:25.0 |
HIP 23191 |
9.68 |
| 2026-02-09 12:00 |
04:58:43.53 |
+20:09:28.0 |
HIP 23191 |
10.12 |
| 2026-02-10 00:00 |
04:58:41.72 |
+20:09:31.3 |
HIP 23191 |
10.53 |
| 2026-02-10 12:00 |
04:58:40.05 |
+20:09:34.8 |
HIP 23191 |
10.90 |
| 2026-02-11 00:00 |
04:58:38.52 |
+20:09:38.5 |
HIP 23191 |
11.24 |
| 2026-02-11 12:00 |
04:58:37.14 |
+20:09:42.5 |
HIP 23191 |
11.55 |
| 2026-02-12 00:00 |
04:58:35.91 |
+20:09:46.7 |
HIP 23082 |
11.81 |
| 2026-02-12 12:00 |
04:58:34.82 |
+20:09:51.2 |
HIP 23082 |
11.59 |
| 2026-02-13 00:00 |
04:58:33.87 |
+20:09:55.9 |
HIP 23082 |
11.39 |
| 2026-02-13 12:00 |
04:58:33.07 |
+20:10:00.8 |
HIP 23082 |
11.21 |
| 2026-02-14 00:00 |
04:58:32.41 |
+20:10:06.0 |
HIP 23082 |
11.04 |
| 2026-02-14 12:00 |
04:58:31.91 |
+20:10:11.4 |
HIP 23082 |
10.90 |
| 2026-02-15 00:00 |
04:58:31.54 |
+20:10:17.0 |
HIP 23082 |
10.77 |
| 2026-02-15 12:00 |
04:58:31.32 |
+20:10:22.9 |
HIP 23082 |
10.66 |
| 2026-02-16 00:00 |
04:58:31.25 |
+20:10:29.0 |
HIP 23082 |
10.57 |
| 2026-02-16 12:00 |
04:58:31.32 |
+20:10:35.4 |
HIP 23082 |
10.50 |
| 2026-02-17 00:00 |
04:58:31.53 |
+20:10:41.9 |
HIP 23082 |
10.45 |
| 2026-02-17 12:00 |
04:58:31.89 |
+20:10:48.7 |
HIP 23082 |
10.41 |
| 2026-02-18 00:00 |
04:58:32.40 |
+20:10:55.8 |
HIP 23082 |
10.40 |
| 2026-02-18 12:00 |
04:58:33.05 |
+20:11:03.0 |
HIP 23082 |
10.41 |
| 2026-02-19 00:00 |
04:58:33.84 |
+20:11:10.5 |
HIP 23082 |
10.44 |
| 2026-02-19 12:00 |
04:58:34.78 |
+20:11:18.2 |
HIP 23082 |
10.50 |
| 2026-02-20 00:00 |
04:58:35.86 |
+20:11:26.1 |
HIP 23082 |
10.59 |
| 2026-02-20 12:00 |
04:58:37.09 |
+20:11:34.3 |
HIP 23082 |
10.70 |
| 2026-02-21 00:00 |
04:58:38.45 |
+20:11:42.7 |
HIP 23082 |
10.85 |
| 2026-02-21 12:00 |
04:58:39.97 |
+20:11:51.3 |
HIP 23191 |
10.72 |
| 2026-02-22 00:00 |
04:58:41.62 |
+20:12:00.1 |
HIP 23191 |
10.34 |
| 2026-02-22 12:00 |
04:58:43.42 |
+20:12:09.1 |
HIP 23191 |
9.92 |
| 2026-02-23 00:00 |
04:58:45.36 |
+20:12:18.3 |
HIP 23191 |
9.48 |
| 2026-02-23 12:00 |
04:58:47.44 |
+20:12:27.7 |
HIP 23191 |
9.00 |
| 2026-02-24 00:00 |
04:58:49.66 |
+20:12:37.4 |
HIP 23191 |
8.50 |