307P/LINEAR
| Parameter |
Value |
| Designation |
307P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-12-20T02:14:44.448000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:19Z |
| Obs used |
220 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
15.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-03-15.0000000 |
| e |
0.67474337 |
| q (au) |
1.888711 |
| a (au) |
5.806833 |
| i (deg) |
4.424845 |
| Ω (om, deg) |
158.120857 |
| ω (w, deg) |
222.112616 |
| M (ma, deg) |
314.562147 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.505 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.505 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.912 |
| 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) |
| 2026-02-03 00:00 |
16:04:26.55 |
-16:32:30.5 |
HIP 78664 |
15.21 |
| 2026-02-03 12:00 |
16:04:36.70 |
-16:32:41.7 |
HIP 78664 |
17.38 |
| 2026-02-04 00:00 |
16:04:46.73 |
-16:32:52.4 |
HIP 78664 |
19.59 |
| 2026-02-04 12:00 |
16:04:56.66 |
-16:33:02.7 |
HIP 78755 |
20.26 |
| 2026-02-05 00:00 |
16:05:06.47 |
-16:33:12.6 |
HIP 78755 |
20.59 |
| 2026-02-05 12:00 |
16:05:16.18 |
-16:33:22.0 |
HIP 78755 |
21.18 |
| 2026-02-06 00:00 |
16:05:25.77 |
-16:33:31.0 |
HIP 78755 |
21.99 |
| 2026-02-06 12:00 |
16:05:35.24 |
-16:33:39.6 |
HIP 78755 |
23.00 |
| 2026-02-07 00:00 |
16:05:44.61 |
-16:33:47.7 |
HIP 78755 |
24.17 |
| 2026-02-07 12:00 |
16:05:53.85 |
-16:33:55.3 |
HIP 78755 |
25.47 |
| 2026-02-08 00:00 |
16:06:02.98 |
-16:34:02.6 |
HIP 79015 |
23.94 |
| 2026-02-08 12:00 |
16:06:12.00 |
-16:34:09.3 |
HIP 79015 |
21.82 |
| 2026-02-09 00:00 |
16:06:20.89 |
-16:34:15.7 |
HIP 79015 |
19.73 |
| 2026-02-09 12:00 |
16:06:29.67 |
-16:34:21.6 |
HIP 79015 |
17.68 |
| 2026-02-10 00:00 |
16:06:38.33 |
-16:34:27.1 |
HIP 79015 |
15.67 |
| 2026-02-10 12:00 |
16:06:46.87 |
-16:34:32.1 |
HIP 79015 |
13.70 |
| 2026-02-11 00:00 |
16:06:55.29 |
-16:34:36.7 |
HIP 79015 |
11.79 |
| 2026-02-11 12:00 |
16:07:03.58 |
-16:34:40.8 |
HIP 79015 |
9.94 |
| 2026-02-12 00:00 |
16:07:11.76 |
-16:34:44.5 |
HIP 79015 |
8.19 |
| 2026-02-12 12:00 |
16:07:19.81 |
-16:34:47.7 |
HIP 79015 |
6.57 |
| 2026-02-13 00:00 |
16:07:27.74 |
-16:34:50.5 |
HIP 79015 |
5.19 |
| 2026-02-13 12:00 |
16:07:35.54 |
-16:34:52.9 |
HIP 79015 |
4.23 |
| 2026-02-14 00:00 |
16:07:43.22 |
-16:34:54.8 |
HIP 79015 |
3.98 |
| 2026-02-14 12:00 |
16:07:50.77 |
-16:34:56.3 |
HIP 79015 |
4.51 |
| 2026-02-15 00:00 |
16:07:58.19 |
-16:34:57.3 |
HIP 79015 |
5.57 |
| 2026-02-15 12:00 |
16:08:05.49 |
-16:34:57.9 |
HIP 79015 |
6.91 |
| 2026-02-16 00:00 |
16:08:12.65 |
-16:34:58.1 |
HIP 79015 |
8.36 |
| 2026-02-16 12:00 |
16:08:19.69 |
-16:34:57.8 |
HIP 79015 |
9.87 |
| 2026-02-17 00:00 |
16:08:26.60 |
-16:34:57.0 |
HIP 79015 |
11.40 |
| 2026-02-17 12:00 |
16:08:33.38 |
-16:34:55.8 |
HIP 79015 |
12.93 |
| 2026-02-18 00:00 |
16:08:40.02 |
-16:34:54.2 |
HIP 79015 |
14.45 |
| 2026-02-18 12:00 |
16:08:46.54 |
-16:34:52.1 |
HIP 79015 |
15.94 |
| 2026-02-19 00:00 |
16:08:52.92 |
-16:34:49.6 |
HIP 79015 |
17.42 |
| 2026-02-19 12:00 |
16:08:59.17 |
-16:34:46.7 |
HIP 79015 |
18.87 |
| 2026-02-20 00:00 |
16:09:05.28 |
-16:34:43.3 |
HIP 79015 |
20.30 |
| 2026-02-20 12:00 |
16:09:11.26 |
-16:34:39.4 |
HIP 79015 |
21.70 |
| 2026-02-21 00:00 |
16:09:17.10 |
-16:34:35.1 |
HIP 79015 |
23.07 |
| 2026-02-21 12:00 |
16:09:22.81 |
-16:34:30.4 |
HIP 79015 |
24.41 |
| 2026-02-22 00:00 |
16:09:28.38 |
-16:34:25.3 |
HIP 79015 |
25.72 |
| 2026-02-22 12:00 |
16:09:33.82 |
-16:34:19.7 |
HIP 79015 |
27.00 |
| 2026-02-23 00:00 |
16:09:39.12 |
-16:34:13.6 |
HIP 79015 |
28.25 |
| 2026-02-23 12:00 |
16:09:44.28 |
-16:34:07.2 |
HIP 79015 |
29.47 |
| 2026-02-24 00:00 |
16:09:49.30 |
-16:34:00.3 |
HIP 79015 |
30.65 |