| 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) |
| 2026-03-26 00:00 |
00:15:18.16 |
-24:23:41.1 |
HIP 1248 |
4.67 |
| 2026-03-26 12:00 |
00:15:41.74 |
-24:21:29.9 |
HIP 1248 |
1.86 |
| 2026-03-27 00:00 |
00:16:05.30 |
-24:19:19.4 |
HIP 1248 |
7.23 |
| 2026-03-27 12:00 |
00:16:28.85 |
-24:17:09.8 |
HIP 1248 |
12.96 |
| 2026-03-28 00:00 |
00:16:52.38 |
-24:15:00.9 |
HIP 1262 |
16.10 |
| 2026-03-28 12:00 |
00:17:15.90 |
-24:12:52.9 |
HIP 1262 |
20.30 |
| 2026-03-29 00:00 |
00:17:39.40 |
-24:10:45.6 |
HIP 1537 |
20.93 |
| 2026-03-29 12:00 |
00:18:02.88 |
-24:08:39.1 |
HIP 1537 |
16.45 |
| 2026-03-30 00:00 |
00:18:26.35 |
-24:06:33.4 |
HIP 1537 |
13.01 |
| 2026-03-30 12:00 |
00:18:49.79 |
-24:04:28.5 |
HIP 1537 |
11.57 |
| 2026-03-31 00:00 |
00:19:13.22 |
-24:02:24.4 |
HIP 1537 |
12.79 |
| 2026-03-31 12:00 |
00:19:36.63 |
-24:00:21.1 |
HIP 1537 |
16.09 |
| 2026-04-01 00:00 |
00:20:00.02 |
-23:58:18.6 |
HIP 1537 |
20.47 |
| 2026-04-01 12:00 |
00:20:23.39 |
-23:56:16.9 |
HIP 1660 |
19.35 |
| 2026-04-02 00:00 |
00:20:46.73 |
-23:54:16.0 |
HIP 1660 |
16.46 |
| 2026-04-02 12:00 |
00:21:10.06 |
-23:52:16.0 |
HIP 1660 |
15.27 |
| 2026-04-03 00:00 |
00:21:33.36 |
-23:50:16.8 |
HIP 1765 |
10.66 |
| 2026-04-03 12:00 |
00:21:56.64 |
-23:48:18.4 |
HIP 1765 |
5.75 |
| 2026-04-04 00:00 |
00:22:19.90 |
-23:46:20.8 |
HIP 1765 |
4.08 |
| 2026-04-04 12:00 |
00:22:43.14 |
-23:44:24.0 |
HIP 1765 |
8.02 |
| 2026-04-05 00:00 |
00:23:06.35 |
-23:42:28.1 |
HIP 1765 |
13.26 |
| 2026-04-05 12:00 |
00:23:29.53 |
-23:40:33.1 |
HIP 1765 |
18.73 |
| 2026-04-06 00:00 |
00:23:52.70 |
-23:38:38.8 |
HIP 1915 |
15.20 |
| 2026-04-06 12:00 |
00:24:15.83 |
-23:36:45.5 |
HIP 1961 |
12.09 |
| 2026-04-07 00:00 |
00:24:38.94 |
-23:34:52.9 |
HIP 1961 |
7.94 |
| 2026-04-07 12:00 |
00:25:02.03 |
-23:33:01.3 |
HIP 1961 |
6.58 |
| 2026-04-08 00:00 |
00:25:25.09 |
-23:31:10.5 |
HIP 1961 |
9.30 |
| 2026-04-08 12:00 |
00:25:48.12 |
-23:29:20.5 |
HIP 1961 |
13.87 |
| 2026-04-09 00:00 |
00:26:11.12 |
-23:27:31.5 |
HIP 1961 |
18.99 |
| 2026-04-09 12:00 |
00:26:34.09 |
-23:25:43.3 |
HIP 1961 |
24.31 |
| 2026-04-10 00:00 |
00:26:57.03 |
-23:23:55.9 |
HIP 2110 |
27.07 |
| 2026-04-10 12:00 |
00:27:19.95 |
-23:22:09.5 |
HIP 2110 |
26.28 |
| 2026-04-11 00:00 |
00:27:42.83 |
-23:20:24.0 |
HIP 2110 |
26.66 |
| 2026-04-11 12:00 |
00:28:05.68 |
-23:18:39.3 |
HIP 2238 |
27.64 |
| 2026-04-12 00:00 |
00:28:28.51 |
-23:16:55.5 |
HIP 2238 |
25.66 |
| 2026-04-12 12:00 |
00:28:51.29 |
-23:15:12.7 |
HIP 2238 |
24.79 |
| 2026-04-13 00:00 |
00:29:14.05 |
-23:13:30.7 |
HIP 2238 |
25.13 |
| 2026-04-13 12:00 |
00:29:36.77 |
-23:11:49.7 |
HIP 2238 |
26.64 |
| 2026-04-14 00:00 |
00:29:59.46 |
-23:10:09.5 |
HIP 2443 |
24.27 |
| 2026-04-14 12:00 |
00:30:22.12 |
-23:08:30.3 |
HIP 2443 |
22.94 |
| 2026-04-15 00:00 |
00:30:44.73 |
-23:06:52.0 |
HIP 2443 |
22.85 |
| 2026-04-15 12:00 |
00:31:07.32 |
-23:05:14.7 |
HIP 2443 |
24.01 |
| 2026-04-16 00:00 |
00:31:29.86 |
-23:03:38.3 |
HIP 2443 |
26.26 |