| 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 |
-0.998 |
| 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) |
| 2026-05-12 00:00 |
00:49:56.51 |
-22:02:58.4 |
HIP 3893 |
3.15 |
| 2026-05-12 12:00 |
00:50:16.25 |
-22:02:16.3 |
HIP 3893 |
6.03 |
| 2026-05-13 00:00 |
00:50:35.93 |
-22:01:35.4 |
HIP 3893 |
10.25 |
| 2026-05-13 12:00 |
00:50:55.53 |
-22:00:55.7 |
HIP 3893 |
14.69 |
| 2026-05-14 00:00 |
00:51:15.07 |
-22:00:17.0 |
HIP 3893 |
19.18 |
| 2026-05-14 12:00 |
00:51:34.53 |
-21:59:39.5 |
HIP 3893 |
23.68 |
| 2026-05-15 00:00 |
00:51:53.92 |
-21:59:03.2 |
HIP 4194 |
26.82 |
| 2026-05-15 12:00 |
00:52:13.24 |
-21:58:27.9 |
HIP 4194 |
23.37 |
| 2026-05-16 00:00 |
00:52:32.48 |
-21:57:53.8 |
HIP 4194 |
20.33 |
| 2026-05-16 12:00 |
00:52:51.65 |
-21:57:20.9 |
HIP 4194 |
17.91 |
| 2026-05-17 00:00 |
00:53:10.75 |
-21:56:49.1 |
HIP 4259 |
16.06 |
| 2026-05-17 12:00 |
00:53:29.77 |
-21:56:18.5 |
HIP 4259 |
11.63 |
| 2026-05-18 00:00 |
00:53:48.71 |
-21:55:49.0 |
HIP 4259 |
7.23 |
| 2026-05-18 12:00 |
00:54:07.57 |
-21:55:20.7 |
HIP 4259 |
2.92 |
| 2026-05-19 00:00 |
00:54:26.36 |
-21:54:53.5 |
HIP 4259 |
1.84 |
| 2026-05-19 12:00 |
00:54:45.07 |
-21:54:27.5 |
HIP 4259 |
6.03 |
| 2026-05-20 00:00 |
00:55:03.70 |
-21:54:02.7 |
HIP 4259 |
10.34 |
| 2026-05-20 12:00 |
00:55:22.24 |
-21:53:39.0 |
HIP 4259 |
14.65 |
| 2026-05-21 00:00 |
00:55:40.71 |
-21:53:16.5 |
HIP 4259 |
18.94 |
| 2026-05-21 12:00 |
00:55:59.09 |
-21:52:55.2 |
HIP 4259 |
23.21 |
| 2026-05-22 00:00 |
00:56:17.40 |
-21:52:35.0 |
HIP 4259 |
27.46 |
| 2026-05-22 12:00 |
00:56:35.62 |
-21:52:16.0 |
HIP 4259 |
31.70 |
| 2026-05-23 00:00 |
00:56:53.75 |
-21:51:58.2 |
HIP 4481 |
34.06 |
| 2026-05-23 12:00 |
00:57:11.81 |
-21:51:41.5 |
HIP 4481 |
33.66 |
| 2026-05-24 00:00 |
00:57:29.77 |
-21:51:26.0 |
HIP 4481 |
33.77 |
| 2026-05-24 12:00 |
00:57:47.66 |
-21:51:11.8 |
HIP 4481 |
34.36 |
| 2026-05-25 00:00 |
00:58:05.45 |
-21:50:58.6 |
HIP 4481 |
35.40 |
| 2026-05-25 12:00 |
00:58:23.16 |
-21:50:46.7 |
HIP 4481 |
36.86 |
| 2026-05-26 00:00 |
00:58:40.79 |
-21:50:35.9 |
HIP 4481 |
38.67 |
| 2026-05-26 12:00 |
00:58:58.32 |
-21:50:26.4 |
HIP 4481 |
40.78 |
| 2026-05-27 00:00 |
00:59:15.77 |
-21:50:18.0 |
HIP 4539 |
42.49 |
| 2026-05-27 12:00 |
00:59:33.13 |
-21:50:10.8 |
HIP 4835 |
39.14 |
| 2026-05-28 00:00 |
00:59:50.39 |
-21:50:04.7 |
HIP 4835 |
35.37 |
| 2026-05-28 12:00 |
01:00:07.57 |
-21:50:00.0 |
HIP 4835 |
31.68 |
| 2026-05-29 00:00 |
01:00:24.66 |
-21:49:56.3 |
HIP 4835 |
28.11 |
| 2026-05-29 12:00 |
01:00:41.66 |
-21:49:53.8 |
HIP 4835 |
24.69 |
| 2026-05-30 00:00 |
01:00:58.56 |
-21:49:52.6 |
HIP 4835 |
21.48 |
| 2026-05-30 12:00 |
01:01:15.37 |
-21:49:52.5 |
HIP 4835 |
18.58 |
| 2026-05-31 00:00 |
01:01:32.09 |
-21:49:53.6 |
HIP 4835 |
16.13 |
| 2026-05-31 12:00 |
01:01:48.71 |
-21:49:56.0 |
HIP 4835 |
14.36 |
| 2026-06-01 00:00 |
01:02:05.24 |
-21:49:59.5 |
HIP 4835 |
13.52 |
| 2026-06-01 12:00 |
01:02:21.68 |
-21:50:04.3 |
HIP 4855 |
13.51 |
| 2026-06-02 00:00 |
01:02:38.02 |
-21:50:10.2 |
HIP 4855 |
13.76 |