345P/LINEAR
| Parameter |
Value |
| Designation |
345P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-07-15T10:40:53.382720Z |
| Orbit solution date (soln_date, UTC) |
2024-10-19T00:12:17Z |
| Obs used |
190 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-08-23.0000000 |
| e |
0.21947831 |
| q (au) |
3.158034 |
| a (au) |
4.046055 |
| i (deg) |
2.724989 |
| Ω (om, deg) |
154.521613 |
| ω (w, deg) |
196.465742 |
| M (ma, deg) |
4.669134 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.190 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.190 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.780 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
04:18:05.14 |
+18:19:05.5 |
HIP 20056 |
3.76 |
| 2026-02-03 12:00 |
04:18:10.00 |
+18:19:44.3 |
HIP 20056 |
4.75 |
| 2026-02-04 00:00 |
04:18:15.14 |
+18:20:23.8 |
HIP 20056 |
5.91 |
| 2026-02-04 12:00 |
04:18:20.55 |
+18:21:04.0 |
HIP 20056 |
7.20 |
| 2026-02-05 00:00 |
04:18:26.23 |
+18:21:44.7 |
HIP 20056 |
8.59 |
| 2026-02-05 12:00 |
04:18:32.18 |
+18:22:26.0 |
HIP 20056 |
10.07 |
| 2026-02-06 00:00 |
04:18:38.40 |
+18:23:08.0 |
HIP 20056 |
11.63 |
| 2026-02-06 12:00 |
04:18:44.88 |
+18:23:50.5 |
HIP 20056 |
13.26 |
| 2026-02-07 00:00 |
04:18:51.63 |
+18:24:33.6 |
HIP 20056 |
14.96 |
| 2026-02-07 12:00 |
04:18:58.64 |
+18:25:17.4 |
HIP 20056 |
16.72 |
| 2026-02-08 00:00 |
04:19:05.92 |
+18:26:01.6 |
HIP 20056 |
18.56 |
| 2026-02-08 12:00 |
04:19:13.46 |
+18:26:46.5 |
HIP 20056 |
20.46 |
| 2026-02-09 00:00 |
04:19:21.26 |
+18:27:31.9 |
HIP 20056 |
22.42 |
| 2026-02-09 12:00 |
04:19:29.32 |
+18:28:17.9 |
HIP 20255 |
20.95 |
| 2026-02-10 00:00 |
04:19:37.64 |
+18:29:04.4 |
HIP 20255 |
19.13 |
| 2026-02-10 12:00 |
04:19:46.22 |
+18:29:51.5 |
HIP 20255 |
17.34 |
| 2026-02-11 00:00 |
04:19:55.06 |
+18:30:39.1 |
HIP 20255 |
15.62 |
| 2026-02-11 12:00 |
04:20:04.16 |
+18:31:27.2 |
HIP 20255 |
14.01 |
| 2026-02-12 00:00 |
04:20:13.51 |
+18:32:15.9 |
HIP 20255 |
12.60 |
| 2026-02-12 12:00 |
04:20:23.11 |
+18:33:05.0 |
HIP 20255 |
11.49 |
| 2026-02-13 00:00 |
04:20:32.97 |
+18:33:54.7 |
HIP 20255 |
10.82 |
| 2026-02-13 12:00 |
04:20:43.08 |
+18:34:44.9 |
HIP 20255 |
10.71 |
| 2026-02-14 00:00 |
04:20:53.44 |
+18:35:35.6 |
HIP 20255 |
11.21 |
| 2026-02-14 12:00 |
04:21:04.05 |
+18:36:26.7 |
HIP 20255 |
12.30 |
| 2026-02-15 00:00 |
04:21:14.91 |
+18:37:18.4 |
HIP 20350 |
12.91 |
| 2026-02-15 12:00 |
04:21:26.02 |
+18:38:10.5 |
HIP 20350 |
13.20 |
| 2026-02-16 00:00 |
04:21:37.37 |
+18:39:03.1 |
HIP 20350 |
14.05 |
| 2026-02-16 12:00 |
04:21:48.97 |
+18:39:56.1 |
HIP 20350 |
15.40 |
| 2026-02-17 00:00 |
04:22:00.82 |
+18:40:49.6 |
HIP 20350 |
17.16 |
| 2026-02-17 12:00 |
04:22:12.90 |
+18:41:43.5 |
HIP 20350 |
19.26 |
| 2026-02-18 00:00 |
04:22:25.23 |
+18:42:37.8 |
HIP 20350 |
21.60 |
| 2026-02-18 12:00 |
04:22:37.80 |
+18:43:32.6 |
HIP 20350 |
24.15 |
| 2026-02-19 00:00 |
04:22:50.61 |
+18:44:27.8 |
HIP 20350 |
26.87 |
| 2026-02-19 12:00 |
04:23:03.65 |
+18:45:23.4 |
HIP 20600 |
25.31 |
| 2026-02-20 00:00 |
04:23:16.93 |
+18:46:19.4 |
HIP 20600 |
22.04 |
| 2026-02-20 12:00 |
04:23:30.45 |
+18:47:15.8 |
HIP 20600 |
18.73 |
| 2026-02-21 00:00 |
04:23:44.19 |
+18:48:12.6 |
HIP 20600 |
15.38 |
| 2026-02-21 12:00 |
04:23:58.17 |
+18:49:09.7 |
HIP 20600 |
11.99 |
| 2026-02-22 00:00 |
04:24:12.38 |
+18:50:07.2 |
HIP 20600 |
8.61 |
| 2026-02-22 12:00 |
04:24:26.82 |
+18:51:05.1 |
HIP 20600 |
5.32 |
| 2026-02-23 00:00 |
04:24:41.49 |
+18:52:03.3 |
HIP 20600 |
2.75 |
| 2026-02-23 12:00 |
04:24:56.38 |
+18:53:01.8 |
HIP 20600 |
3.63 |
| 2026-02-24 00:00 |
04:25:11.49 |
+18:54:00.7 |
HIP 20646 |
3.99 |