247P/LINEAR
| Parameter |
Value |
| Designation |
247P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2011-01-04T03:56:54.191040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:04Z |
| Obs used |
1346 |
| NEO |
- |
| M1 |
17.900 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-09-09.0000000 |
| e |
0.62561919 |
| q (au) |
1.484389 |
| a (au) |
3.964918 |
| i (deg) |
13.682326 |
| Ω (om, deg) |
54.122500 |
| ω (w, deg) |
47.339311 |
| M (ma, deg) |
30.939706 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.699 + 3.514\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.699 |
| n |
3.514 |
| gf |
1.000 |
| gb |
-0.555 |
| 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 |
23:19:56.93 |
-14:21:26.8 |
HIP 115225 |
5.89 |
| 2026-02-03 12:00 |
23:20:34.40 |
-14:16:12.0 |
HIP 115225 |
8.37 |
| 2026-02-04 00:00 |
23:21:11.98 |
-14:10:56.6 |
HIP 115327 |
10.38 |
| 2026-02-04 12:00 |
23:21:49.67 |
-14:05:40.6 |
HIP 115327 |
5.43 |
| 2026-02-05 00:00 |
23:22:27.47 |
-14:00:23.9 |
HIP 115401 |
7.36 |
| 2026-02-05 12:00 |
23:23:05.37 |
-13:55:06.7 |
HIP 115401 |
6.91 |
| 2026-02-06 00:00 |
23:23:43.38 |
-13:49:48.8 |
HIP 115401 |
16.35 |
| 2026-02-06 12:00 |
23:24:21.49 |
-13:44:30.4 |
HIP 115626 |
22.54 |
| 2026-02-07 00:00 |
23:24:59.71 |
-13:39:11.4 |
HIP 115626 |
22.61 |
| 2026-02-07 12:00 |
23:25:38.03 |
-13:33:51.7 |
HIP 115626 |
27.27 |
| 2026-02-08 00:00 |
23:26:16.46 |
-13:28:31.5 |
HIP 115685 |
31.51 |
| 2026-02-08 12:00 |
23:26:55.00 |
-13:23:10.6 |
HIP 115685 |
27.51 |
| 2026-02-09 00:00 |
23:27:33.63 |
-13:17:49.2 |
HIP 115789 |
22.09 |
| 2026-02-09 12:00 |
23:28:12.37 |
-13:12:27.2 |
HIP 115789 |
20.10 |
| 2026-02-10 00:00 |
23:28:51.21 |
-13:07:04.6 |
HIP 115954 |
15.75 |
| 2026-02-10 12:00 |
23:29:30.16 |
-13:01:41.4 |
HIP 115987 |
11.33 |
| 2026-02-11 00:00 |
23:30:09.21 |
-12:56:17.6 |
HIP 115987 |
4.61 |
| 2026-02-11 12:00 |
23:30:48.35 |
-12:50:53.2 |
HIP 115987 |
12.41 |
| 2026-02-12 00:00 |
23:31:27.60 |
-12:45:28.3 |
HIP 115987 |
23.00 |
| 2026-02-12 12:00 |
23:32:06.95 |
-12:40:02.7 |
HIP 116245 |
16.71 |
| 2026-02-13 00:00 |
23:32:46.40 |
-12:34:36.6 |
HIP 116245 |
6.99 |
| 2026-02-13 12:00 |
23:33:25.96 |
-12:29:09.9 |
HIP 116245 |
7.94 |
| 2026-02-14 00:00 |
23:34:05.60 |
-12:23:42.7 |
HIP 116349 |
8.15 |
| 2026-02-14 12:00 |
23:34:45.35 |
-12:18:14.9 |
HIP 116349 |
2.99 |
| 2026-02-15 00:00 |
23:35:25.20 |
-12:12:46.5 |
HIP 116349 |
14.16 |
| 2026-02-15 12:00 |
23:36:05.14 |
-12:07:17.5 |
HIP 116593 |
23.95 |
| 2026-02-16 00:00 |
23:36:45.19 |
-12:01:48.0 |
HIP 116593 |
17.13 |
| 2026-02-16 12:00 |
23:37:25.33 |
-11:56:17.9 |
HIP 116593 |
16.28 |
| 2026-02-17 00:00 |
23:38:05.56 |
-11:50:47.3 |
HIP 116593 |
22.14 |
| 2026-02-17 12:00 |
23:38:45.89 |
-11:45:16.1 |
HIP 116593 |
31.16 |
| 2026-02-18 00:00 |
23:39:26.32 |
-11:39:44.4 |
HIP 116853 |
25.13 |
| 2026-02-18 12:00 |
23:40:06.84 |
-11:34:12.1 |
HIP 116841 |
14.22 |
| 2026-02-19 00:00 |
23:40:47.46 |
-11:28:39.3 |
HIP 116841 |
2.99 |
| 2026-02-19 12:00 |
23:41:28.17 |
-11:23:05.9 |
HIP 116841 |
8.69 |
| 2026-02-20 00:00 |
23:42:08.97 |
-11:17:32.1 |
HIP 116975 |
9.77 |
| 2026-02-20 12:00 |
23:42:49.87 |
-11:11:57.6 |
HIP 116975 |
7.76 |
| 2026-02-21 00:00 |
23:43:30.86 |
-11:06:22.7 |
HIP 117093 |
13.18 |
| 2026-02-21 12:00 |
23:44:11.94 |
-11:00:47.2 |
HIP 117093 |
1.92 |
| 2026-02-22 00:00 |
23:44:53.12 |
-10:55:11.2 |
HIP 117093 |
9.99 |
| 2026-02-22 12:00 |
23:45:34.38 |
-10:49:34.7 |
HIP 117212 |
19.11 |
| 2026-02-23 00:00 |
23:46:15.74 |
-10:43:57.7 |
HIP 117212 |
13.09 |
| 2026-02-23 12:00 |
23:46:57.18 |
-10:38:20.2 |
HIP 117212 |
15.74 |
| 2026-02-24 00:00 |
23:47:38.72 |
-10:32:42.1 |
HIP 117212 |
24.41 |