| Parameter |
Value |
| Designation |
165P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2000-06-15T19:02:32.447040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:27:43Z |
| Obs used |
143 |
| NEO |
- |
| M1 |
5.900 |
| K1 |
11.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-07-24.0000000 |
| e |
0.62158598 |
| q (au) |
6.830373 |
| a (au) |
18.050001 |
| i (deg) |
15.905264 |
| Ω (om, deg) |
0.638768 |
| ω (w, deg) |
126.205423 |
| M (ma, deg) |
5.182220 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.024 + 5.222\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.024 |
| n |
5.222 |
| gf |
1.000 |
| gb |
-0.919 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
19:44:40.08 |
-36:27:36.8 |
HIP 96932 |
31.31 |
| 2026-03-26 12:00 |
19:44:42.55 |
-36:27:47.0 |
HIP 96932 |
31.72 |
| 2026-03-27 00:00 |
19:44:44.98 |
-36:27:57.4 |
HIP 96932 |
32.13 |
| 2026-03-27 12:00 |
19:44:47.36 |
-36:28:07.9 |
HIP 96932 |
32.53 |
| 2026-03-28 00:00 |
19:44:49.70 |
-36:28:18.5 |
HIP 96932 |
32.92 |
| 2026-03-28 12:00 |
19:44:52.01 |
-36:28:29.3 |
HIP 96932 |
33.31 |
| 2026-03-29 00:00 |
19:44:54.26 |
-36:28:40.2 |
HIP 96932 |
33.70 |
| 2026-03-29 12:00 |
19:44:56.48 |
-36:28:51.2 |
HIP 96932 |
34.07 |
| 2026-03-30 00:00 |
19:44:58.65 |
-36:29:02.4 |
HIP 96932 |
34.44 |
| 2026-03-30 12:00 |
19:45:00.78 |
-36:29:13.7 |
HIP 96932 |
34.81 |
| 2026-03-31 00:00 |
19:45:02.86 |
-36:29:25.1 |
HIP 96932 |
35.17 |
| 2026-03-31 12:00 |
19:45:04.91 |
-36:29:36.7 |
HIP 96932 |
35.52 |
| 2026-04-01 00:00 |
19:45:06.91 |
-36:29:48.4 |
HIP 96932 |
35.86 |
| 2026-04-01 12:00 |
19:45:08.86 |
-36:30:00.3 |
HIP 96932 |
36.20 |
| 2026-04-02 00:00 |
19:45:10.77 |
-36:30:12.3 |
HIP 96932 |
36.53 |
| 2026-04-02 12:00 |
19:45:12.64 |
-36:30:24.4 |
HIP 96932 |
36.85 |
| 2026-04-03 00:00 |
19:45:14.46 |
-36:30:36.6 |
HIP 96932 |
37.17 |
| 2026-04-03 12:00 |
19:45:16.24 |
-36:30:49.0 |
HIP 96932 |
37.48 |
| 2026-04-04 00:00 |
19:45:17.98 |
-36:31:01.5 |
HIP 96932 |
37.78 |
| 2026-04-04 12:00 |
19:45:19.67 |
-36:31:14.1 |
HIP 96932 |
38.08 |
| 2026-04-05 00:00 |
19:45:21.32 |
-36:31:26.8 |
HIP 96932 |
38.37 |
| 2026-04-05 12:00 |
19:45:22.92 |
-36:31:39.7 |
HIP 96932 |
38.65 |
| 2026-04-06 00:00 |
19:45:24.48 |
-36:31:52.7 |
HIP 96932 |
38.92 |
| 2026-04-06 12:00 |
19:45:25.99 |
-36:32:05.8 |
HIP 96932 |
39.18 |
| 2026-04-07 00:00 |
19:45:27.46 |
-36:32:19.1 |
HIP 96932 |
39.44 |
| 2026-04-07 12:00 |
19:45:28.89 |
-36:32:32.5 |
HIP 96932 |
39.69 |
| 2026-04-08 00:00 |
19:45:30.27 |
-36:32:45.9 |
HIP 96932 |
39.94 |
| 2026-04-08 12:00 |
19:45:31.60 |
-36:32:59.6 |
HIP 96932 |
40.17 |
| 2026-04-09 00:00 |
19:45:32.89 |
-36:33:13.3 |
HIP 96932 |
40.40 |
| 2026-04-09 12:00 |
19:45:34.13 |
-36:33:27.1 |
HIP 96932 |
40.62 |
| 2026-04-10 00:00 |
19:45:35.33 |
-36:33:41.1 |
HIP 97354 |
40.73 |
| 2026-04-10 12:00 |
19:45:36.49 |
-36:33:55.2 |
HIP 97354 |
40.41 |
| 2026-04-11 00:00 |
19:45:37.59 |
-36:34:09.4 |
HIP 97354 |
40.10 |
| 2026-04-11 12:00 |
19:45:38.66 |
-36:34:23.7 |
HIP 97354 |
39.79 |
| 2026-04-12 00:00 |
19:45:39.67 |
-36:34:38.1 |
HIP 97354 |
39.48 |
| 2026-04-12 12:00 |
19:45:40.64 |
-36:34:52.7 |
HIP 97354 |
39.18 |
| 2026-04-13 00:00 |
19:45:41.57 |
-36:35:07.3 |
HIP 97354 |
38.87 |
| 2026-04-13 12:00 |
19:45:42.45 |
-36:35:22.1 |
HIP 97354 |
38.58 |
| 2026-04-14 00:00 |
19:45:43.28 |
-36:35:37.0 |
HIP 97354 |
38.28 |
| 2026-04-14 12:00 |
19:45:44.07 |
-36:35:51.9 |
HIP 97354 |
37.98 |
| 2026-04-15 00:00 |
19:45:44.81 |
-36:36:07.0 |
HIP 97354 |
37.69 |
| 2026-04-15 12:00 |
19:45:45.50 |
-36:36:22.2 |
HIP 97354 |
37.40 |
| 2026-04-16 00:00 |
19:45:46.15 |
-36:36:37.5 |
HIP 97354 |
37.12 |