| Parameter |
Value |
| Designation |
256P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-03-17T12:37:58.005120Z |
| Orbit solution date (soln_date, UTC) |
2024-05-30T01:12:33Z |
| Obs used |
270 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
13.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-02-12.0000000 |
| e |
0.41935612 |
| q (au) |
2.689114 |
| a (au) |
4.631263 |
| i (deg) |
27.631658 |
| Ω (om, deg) |
81.436538 |
| ω (w, deg) |
124.120383 |
| M (ma, deg) |
68.874689 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.702 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.702 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-09-20 00:00 |
01:05:42.14 |
-28:12:49.8 |
HIP 5105 |
7.30 |
| 2026-09-20 12:00 |
01:05:26.89 |
-28:14:34.4 |
HIP 5105 |
4.64 |
| 2026-09-21 00:00 |
01:05:11.55 |
-28:16:17.7 |
HIP 5105 |
4.32 |
| 2026-09-21 12:00 |
01:04:56.15 |
-28:17:59.6 |
HIP 5105 |
6.69 |
| 2026-09-22 00:00 |
01:04:40.67 |
-28:19:40.2 |
HIP 5105 |
9.99 |
| 2026-09-22 12:00 |
01:04:25.12 |
-28:21:19.3 |
HIP 5105 |
13.57 |
| 2026-09-23 00:00 |
01:04:09.51 |
-28:22:57.1 |
HIP 5105 |
17.25 |
| 2026-09-23 12:00 |
01:03:53.83 |
-28:24:33.4 |
HIP 5105 |
20.98 |
| 2026-09-24 00:00 |
01:03:38.09 |
-28:26:08.3 |
HIP 5105 |
24.73 |
| 2026-09-24 12:00 |
01:03:22.29 |
-28:27:41.7 |
HIP 5105 |
28.51 |
| 2026-09-25 00:00 |
01:03:06.43 |
-28:29:13.7 |
HIP 5105 |
32.29 |
| 2026-09-25 12:00 |
01:02:50.52 |
-28:30:44.2 |
HIP 4767 |
30.52 |
| 2026-09-26 00:00 |
01:02:34.55 |
-28:32:13.2 |
HIP 4767 |
27.09 |
| 2026-09-26 12:00 |
01:02:18.53 |
-28:33:40.6 |
HIP 4767 |
23.79 |
| 2026-09-27 00:00 |
01:02:02.46 |
-28:35:06.6 |
HIP 4767 |
20.68 |
| 2026-09-27 12:00 |
01:01:46.35 |
-28:36:31.0 |
HIP 4767 |
17.87 |
| 2026-09-28 00:00 |
01:01:30.19 |
-28:37:53.8 |
HIP 4767 |
15.51 |
| 2026-09-28 12:00 |
01:01:13.99 |
-28:39:15.1 |
HIP 4767 |
13.83 |
| 2026-09-29 00:00 |
01:00:57.75 |
-28:40:34.8 |
HIP 4767 |
13.10 |
| 2026-09-29 12:00 |
01:00:41.48 |
-28:41:52.9 |
HIP 4767 |
13.47 |
| 2026-09-30 00:00 |
01:00:25.16 |
-28:43:09.4 |
HIP 4767 |
14.86 |
| 2026-09-30 12:00 |
01:00:08.82 |
-28:44:24.3 |
HIP 4767 |
17.02 |
| 2026-10-01 00:00 |
00:59:52.45 |
-28:45:37.6 |
HIP 4767 |
19.69 |
| 2026-10-01 12:00 |
00:59:36.04 |
-28:46:49.2 |
HIP 4767 |
22.70 |
| 2026-10-02 00:00 |
00:59:19.62 |
-28:47:59.2 |
HIP 4767 |
25.92 |
| 2026-10-02 12:00 |
00:59:03.17 |
-28:49:07.5 |
HIP 4767 |
29.29 |
| 2026-10-03 00:00 |
00:58:46.70 |
-28:50:14.1 |
HIP 4577 |
31.29 |
| 2026-10-03 12:00 |
00:58:30.21 |
-28:51:19.0 |
HIP 4401 |
29.67 |
| 2026-10-04 00:00 |
00:58:13.70 |
-28:52:22.3 |
HIP 4401 |
26.90 |
| 2026-10-04 12:00 |
00:57:57.18 |
-28:53:23.8 |
HIP 4401 |
24.37 |
| 2026-10-05 00:00 |
00:57:40.66 |
-28:54:23.6 |
HIP 4401 |
22.17 |
| 2026-10-05 12:00 |
00:57:24.12 |
-28:55:21.6 |
HIP 4401 |
20.41 |
| 2026-10-06 00:00 |
00:57:07.58 |
-28:56:17.9 |
HIP 4401 |
19.20 |
| 2026-10-06 12:00 |
00:56:51.04 |
-28:57:12.5 |
HIP 4401 |
18.65 |
| 2026-10-07 00:00 |
00:56:34.49 |
-28:58:05.2 |
HIP 4401 |
18.81 |
| 2026-10-07 12:00 |
00:56:17.95 |
-28:58:56.2 |
HIP 4401 |
19.66 |
| 2026-10-08 00:00 |
00:56:01.41 |
-28:59:45.4 |
HIP 4401 |
21.11 |
| 2026-10-08 12:00 |
00:55:44.88 |
-29:00:32.8 |
HIP 4401 |
23.04 |
| 2026-10-09 00:00 |
00:55:28.37 |
-29:01:18.5 |
HIP 4201 |
24.41 |
| 2026-10-09 12:00 |
00:55:11.86 |
-29:02:02.2 |
HIP 4201 |
20.99 |
| 2026-10-10 00:00 |
00:54:55.37 |
-29:02:44.2 |
HIP 4201 |
17.66 |
| 2026-10-10 12:00 |
00:54:38.90 |
-29:03:24.3 |
HIP 4201 |
14.50 |
| 2026-10-11 00:00 |
00:54:22.45 |
-29:04:02.6 |
HIP 4201 |
11.63 |