| 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) |
| 2026-09-20 00:00 |
08:01:31.90 |
+18:39:02.6 |
HIP 39215 |
16.11 |
| 2026-09-20 12:00 |
08:01:56.43 |
+18:37:47.1 |
HIP 39215 |
17.31 |
| 2026-09-21 00:00 |
08:02:20.82 |
+18:36:31.8 |
HIP 39215 |
20.23 |
| 2026-09-21 12:00 |
08:02:45.07 |
+18:35:16.6 |
HIP 39215 |
24.25 |
| 2026-09-22 00:00 |
08:03:09.19 |
+18:34:01.5 |
HIP 39535 |
28.11 |
| 2026-09-22 12:00 |
08:03:33.17 |
+18:32:46.6 |
HIP 39535 |
24.63 |
| 2026-09-23 00:00 |
08:03:57.02 |
+18:31:31.8 |
HIP 39535 |
22.17 |
| 2026-09-23 12:00 |
08:04:20.72 |
+18:30:17.2 |
HIP 39535 |
21.06 |
| 2026-09-24 00:00 |
08:04:44.29 |
+18:29:02.7 |
HIP 39535 |
21.48 |
| 2026-09-24 12:00 |
08:05:07.71 |
+18:27:48.4 |
HIP 39644 |
21.61 |
| 2026-09-25 00:00 |
08:05:31.00 |
+18:26:34.2 |
HIP 39644 |
19.84 |
| 2026-09-25 12:00 |
08:05:54.14 |
+18:25:20.2 |
HIP 39644 |
19.59 |
| 2026-09-26 00:00 |
08:06:17.14 |
+18:24:06.4 |
HIP 39644 |
20.91 |
| 2026-09-26 12:00 |
08:06:40.00 |
+18:22:52.8 |
HIP 39644 |
23.49 |
| 2026-09-27 00:00 |
08:07:02.71 |
+18:21:39.4 |
HIP 39644 |
26.97 |
| 2026-09-27 12:00 |
08:07:25.27 |
+18:20:26.2 |
HIP 39805 |
23.84 |
| 2026-09-28 00:00 |
08:07:47.69 |
+18:19:13.2 |
HIP 39805 |
21.21 |
| 2026-09-28 12:00 |
08:08:09.96 |
+18:18:00.4 |
HIP 39805 |
19.78 |
| 2026-09-29 00:00 |
08:08:32.09 |
+18:16:47.8 |
HIP 39805 |
19.77 |
| 2026-09-29 12:00 |
08:08:54.06 |
+18:15:35.5 |
HIP 39805 |
21.17 |
| 2026-09-30 00:00 |
08:09:15.89 |
+18:14:23.4 |
HIP 39805 |
23.70 |
| 2026-09-30 12:00 |
08:09:37.56 |
+18:13:11.5 |
HIP 39805 |
27.03 |
| 2026-10-01 00:00 |
08:09:59.08 |
+18:11:59.9 |
HIP 39805 |
30.88 |
| 2026-10-01 12:00 |
08:10:20.45 |
+18:10:48.5 |
HIP 39805 |
35.06 |
| 2026-10-02 00:00 |
08:10:41.66 |
+18:09:37.4 |
HIP 40187 |
33.79 |
| 2026-10-02 12:00 |
08:11:02.72 |
+18:08:26.6 |
HIP 40187 |
30.94 |
| 2026-10-03 00:00 |
08:11:23.62 |
+18:07:16.0 |
HIP 40187 |
28.75 |
| 2026-10-03 12:00 |
08:11:44.37 |
+18:06:05.8 |
HIP 40187 |
27.35 |
| 2026-10-04 00:00 |
08:12:04.95 |
+18:04:55.8 |
HIP 40167 |
26.11 |
| 2026-10-04 12:00 |
08:12:25.37 |
+18:03:46.2 |
HIP 40167 |
25.06 |
| 2026-10-05 00:00 |
08:12:45.64 |
+18:02:36.8 |
HIP 40167 |
24.99 |
| 2026-10-05 12:00 |
08:13:05.74 |
+18:01:27.8 |
HIP 40184 |
25.28 |
| 2026-10-06 00:00 |
08:13:25.68 |
+18:00:19.1 |
HIP 40342 |
22.53 |
| 2026-10-06 12:00 |
08:13:45.45 |
+17:59:10.7 |
HIP 40342 |
19.60 |
| 2026-10-07 00:00 |
08:14:05.05 |
+17:58:02.7 |
HIP 40342 |
17.55 |
| 2026-10-07 12:00 |
08:14:24.49 |
+17:56:55.0 |
HIP 40342 |
16.67 |
| 2026-10-08 00:00 |
08:14:43.77 |
+17:55:47.7 |
HIP 40342 |
17.10 |
| 2026-10-08 12:00 |
08:15:02.87 |
+17:54:40.7 |
HIP 40342 |
18.74 |
| 2026-10-09 00:00 |
08:15:21.80 |
+17:53:34.2 |
HIP 40458 |
19.70 |
| 2026-10-09 12:00 |
08:15:40.56 |
+17:52:28.0 |
HIP 40458 |
18.14 |
| 2026-10-10 00:00 |
08:15:59.15 |
+17:51:22.2 |
HIP 40458 |
17.67 |
| 2026-10-10 12:00 |
08:16:17.56 |
+17:50:16.8 |
HIP 40564 |
17.11 |
| 2026-10-11 00:00 |
08:16:35.80 |
+17:49:11.8 |
HIP 40564 |
16.28 |