| Parameter |
Value |
| Designation |
402P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-12-09T19:06:20.517120Z |
| Orbit solution date (soln_date, UTC) |
2024-06-14T15:42:24Z |
| Obs used |
2125 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-02-22.0000000 |
| e |
0.43884048 |
| q (au) |
3.916205 |
| a (au) |
6.978773 |
| i (deg) |
30.894646 |
| Ω (om, deg) |
123.131904 |
| ω (w, deg) |
326.984530 |
| M (ma, deg) |
188.241334 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.541 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.541 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.976 |
| k |
1.000 |
| 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 |
| 2020-08-24 |
2021-12-09 |
+8.2871 |
-5.052 |
| 2021-12-11 |
2024-06-10 |
+1.5638 |
-1.208 |
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 |
15:35:14.97 |
+15:29:56.9 |
HIP 76389 |
23.93 |
| 2026-03-26 12:00 |
15:35:09.21 |
+15:31:45.6 |
HIP 76389 |
23.21 |
| 2026-03-27 00:00 |
15:35:03.32 |
+15:33:33.8 |
HIP 76389 |
22.71 |
| 2026-03-27 12:00 |
15:34:57.33 |
+15:35:21.7 |
HIP 76389 |
22.47 |
| 2026-03-28 00:00 |
15:34:51.21 |
+15:37:09.2 |
HIP 76389 |
22.49 |
| 2026-03-28 12:00 |
15:34:44.99 |
+15:38:56.3 |
HIP 76389 |
22.77 |
| 2026-03-29 00:00 |
15:34:38.65 |
+15:40:43.0 |
HIP 76389 |
23.31 |
| 2026-03-29 12:00 |
15:34:32.20 |
+15:42:29.2 |
HIP 76389 |
24.09 |
| 2026-03-30 00:00 |
15:34:25.64 |
+15:44:15.1 |
HIP 76389 |
25.10 |
| 2026-03-30 12:00 |
15:34:18.96 |
+15:46:00.4 |
HIP 76136 |
23.14 |
| 2026-03-31 00:00 |
15:34:12.18 |
+15:47:45.3 |
HIP 76136 |
20.77 |
| 2026-03-31 12:00 |
15:34:05.29 |
+15:49:29.8 |
HIP 76136 |
18.39 |
| 2026-04-01 00:00 |
15:33:58.29 |
+15:51:13.7 |
HIP 76136 |
16.00 |
| 2026-04-01 12:00 |
15:33:51.18 |
+15:52:57.1 |
HIP 76136 |
13.61 |
| 2026-04-02 00:00 |
15:33:43.97 |
+15:54:40.1 |
HIP 76136 |
11.21 |
| 2026-04-02 12:00 |
15:33:36.65 |
+15:56:22.5 |
HIP 76136 |
8.83 |
| 2026-04-03 00:00 |
15:33:29.23 |
+15:58:04.3 |
HIP 76136 |
6.46 |
| 2026-04-03 12:00 |
15:33:21.70 |
+15:59:45.6 |
HIP 76136 |
4.20 |
| 2026-04-04 00:00 |
15:33:14.07 |
+16:01:26.4 |
HIP 76136 |
2.36 |
| 2026-04-04 12:00 |
15:33:06.34 |
+16:03:06.6 |
HIP 76136 |
2.42 |
| 2026-04-05 00:00 |
15:32:58.50 |
+16:04:46.2 |
HIP 76136 |
4.31 |
| 2026-04-05 12:00 |
15:32:50.57 |
+16:06:25.1 |
HIP 76136 |
6.63 |
| 2026-04-06 00:00 |
15:32:42.54 |
+16:08:03.5 |
HIP 76136 |
9.06 |
| 2026-04-06 12:00 |
15:32:34.40 |
+16:09:41.3 |
HIP 76069 |
8.67 |
| 2026-04-07 00:00 |
15:32:26.18 |
+16:11:18.4 |
HIP 76069 |
8.87 |
| 2026-04-07 12:00 |
15:32:17.85 |
+16:12:54.9 |
HIP 76043 |
7.14 |
| 2026-04-08 00:00 |
15:32:09.43 |
+16:14:30.7 |
HIP 76043 |
5.05 |
| 2026-04-08 12:00 |
15:32:00.91 |
+16:16:05.8 |
HIP 76043 |
3.61 |
| 2026-04-09 00:00 |
15:31:52.30 |
+16:17:40.2 |
HIP 76043 |
3.72 |
| 2026-04-09 12:00 |
15:31:43.60 |
+16:19:13.9 |
HIP 76043 |
5.29 |
| 2026-04-10 00:00 |
15:31:34.81 |
+16:20:47.0 |
HIP 76043 |
7.47 |
| 2026-04-10 12:00 |
15:31:25.93 |
+16:22:19.3 |
HIP 76043 |
9.87 |
| 2026-04-11 00:00 |
15:31:16.96 |
+16:23:50.8 |
HIP 76043 |
12.36 |
| 2026-04-11 12:00 |
15:31:07.90 |
+16:25:21.6 |
HIP 76043 |
14.91 |
| 2026-04-12 00:00 |
15:30:58.75 |
+16:26:51.7 |
HIP 76043 |
17.49 |
| 2026-04-12 12:00 |
15:30:49.52 |
+16:28:20.9 |
HIP 76043 |
20.10 |
| 2026-04-13 00:00 |
15:30:40.20 |
+16:29:49.4 |
HIP 75810 |
21.98 |
| 2026-04-13 12:00 |
15:30:30.80 |
+16:31:17.1 |
HIP 75810 |
20.32 |
| 2026-04-14 00:00 |
15:30:21.32 |
+16:32:43.9 |
HIP 75810 |
18.87 |
| 2026-04-14 12:00 |
15:30:11.76 |
+16:34:10.0 |
HIP 75810 |
17.70 |
| 2026-04-15 00:00 |
15:30:02.12 |
+16:35:35.2 |
HIP 75810 |
16.86 |
| 2026-04-15 12:00 |
15:29:52.40 |
+16:36:59.5 |
HIP 75810 |
16.40 |
| 2026-04-16 00:00 |
15:29:42.60 |
+16:38:23.0 |
HIP 75810 |
16.37 |