| Parameter |
Value |
| Designation |
C/2011 F1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-01-08T00:51:50.987520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:49Z |
| Obs used |
4591 |
| NEO |
- |
| M1 |
10.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-03-17.0000000 |
| e |
1.00004254 |
| q (au) |
1.818879 |
| a (au) |
-42756.084905 |
| i (deg) |
56.610768 |
| Ω (om, deg) |
85.118907 |
| ω (w, deg) |
192.564919 |
| M (ma, deg) |
-0.000033 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.403 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.403 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.769 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2011-03-17 |
2012-11-04 |
+1.2116 |
-0.969 |
| 2013-03-19 |
2014-08-07 |
+5.4983 |
-0.920 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
04:57:44.77 |
+09:22:51.6 |
HIP 23077 |
8.64 |
| 2026-03-26 12:00 |
04:57:46.20 |
+09:23:09.8 |
HIP 23077 |
8.24 |
| 2026-03-27 00:00 |
04:57:47.66 |
+09:23:28.0 |
HIP 23077 |
7.85 |
| 2026-03-27 12:00 |
04:57:49.15 |
+09:23:46.2 |
HIP 23077 |
7.47 |
| 2026-03-28 00:00 |
04:57:50.67 |
+09:24:04.4 |
HIP 23077 |
7.10 |
| 2026-03-28 12:00 |
04:57:52.22 |
+09:24:22.5 |
HIP 23077 |
6.74 |
| 2026-03-29 00:00 |
04:57:53.80 |
+09:24:40.7 |
HIP 23077 |
6.40 |
| 2026-03-29 12:00 |
04:57:55.42 |
+09:24:58.9 |
HIP 23077 |
6.08 |
| 2026-03-30 00:00 |
04:57:57.06 |
+09:25:17.1 |
HIP 23077 |
5.78 |
| 2026-03-30 12:00 |
04:57:58.73 |
+09:25:35.2 |
HIP 23077 |
5.52 |
| 2026-03-31 00:00 |
04:58:00.44 |
+09:25:53.3 |
HIP 23077 |
5.30 |
| 2026-03-31 12:00 |
04:58:02.17 |
+09:26:11.5 |
HIP 23077 |
5.12 |
| 2026-04-01 00:00 |
04:58:03.93 |
+09:26:29.6 |
HIP 23077 |
4.99 |
| 2026-04-01 12:00 |
04:58:05.73 |
+09:26:47.7 |
HIP 23077 |
4.92 |
| 2026-04-02 00:00 |
04:58:07.55 |
+09:27:05.8 |
HIP 23077 |
4.92 |
| 2026-04-02 12:00 |
04:58:09.40 |
+09:27:23.8 |
HIP 23077 |
4.97 |
| 2026-04-03 00:00 |
04:58:11.28 |
+09:27:41.9 |
HIP 23077 |
5.10 |
| 2026-04-03 12:00 |
04:58:13.19 |
+09:28:00.0 |
HIP 23077 |
5.28 |
| 2026-04-04 00:00 |
04:58:15.13 |
+09:28:17.9 |
HIP 23077 |
5.52 |
| 2026-04-04 12:00 |
04:58:17.09 |
+09:28:35.9 |
HIP 23077 |
5.81 |
| 2026-04-05 00:00 |
04:58:19.09 |
+09:28:53.9 |
HIP 23077 |
6.15 |
| 2026-04-05 12:00 |
04:58:21.11 |
+09:29:11.9 |
HIP 23077 |
6.53 |
| 2026-04-06 00:00 |
04:58:23.17 |
+09:29:29.8 |
HIP 23077 |
6.94 |
| 2026-04-06 12:00 |
04:58:25.25 |
+09:29:47.7 |
HIP 23077 |
7.38 |
| 2026-04-07 00:00 |
04:58:27.35 |
+09:30:05.6 |
HIP 23077 |
7.85 |
| 2026-04-07 12:00 |
04:58:29.49 |
+09:30:23.4 |
HIP 23077 |
8.35 |
| 2026-04-08 00:00 |
04:58:31.65 |
+09:30:41.3 |
HIP 23077 |
8.86 |
| 2026-04-08 12:00 |
04:58:33.84 |
+09:30:59.1 |
HIP 23077 |
9.39 |
| 2026-04-09 00:00 |
04:58:36.06 |
+09:31:16.8 |
HIP 23077 |
9.94 |
| 2026-04-09 12:00 |
04:58:38.31 |
+09:31:34.6 |
HIP 23077 |
10.51 |
| 2026-04-10 00:00 |
04:58:40.58 |
+09:31:52.3 |
HIP 23077 |
11.08 |
| 2026-04-10 12:00 |
04:58:42.88 |
+09:32:10.0 |
HIP 23077 |
11.67 |
| 2026-04-11 00:00 |
04:58:45.21 |
+09:32:27.6 |
HIP 23077 |
12.27 |
| 2026-04-11 12:00 |
04:58:47.56 |
+09:32:45.2 |
HIP 23077 |
12.89 |
| 2026-04-12 00:00 |
04:58:49.94 |
+09:33:02.8 |
HIP 23077 |
13.51 |
| 2026-04-12 12:00 |
04:58:52.34 |
+09:33:20.4 |
HIP 23077 |
14.14 |
| 2026-04-13 00:00 |
04:58:54.77 |
+09:33:37.9 |
HIP 23077 |
14.78 |
| 2026-04-13 12:00 |
04:58:57.23 |
+09:33:55.3 |
HIP 23077 |
15.43 |
| 2026-04-14 00:00 |
04:58:59.71 |
+09:34:12.8 |
HIP 23077 |
16.08 |
| 2026-04-14 12:00 |
04:59:02.22 |
+09:34:30.1 |
HIP 23077 |
16.74 |
| 2026-04-15 00:00 |
04:59:04.75 |
+09:34:47.5 |
HIP 23077 |
17.42 |
| 2026-04-15 12:00 |
04:59:07.31 |
+09:35:04.8 |
HIP 23077 |
18.09 |
| 2026-04-16 00:00 |
04:59:09.89 |
+09:35:22.1 |
HIP 23077 |
18.78 |