| 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) |
| 2026-09-20 00:00 |
05:13:23.24 |
+09:50:21.6 |
HIP 24177 |
32.67 |
| 2026-09-20 12:00 |
05:13:22.74 |
+09:50:11.0 |
HIP 24177 |
32.66 |
| 2026-09-21 00:00 |
05:13:22.21 |
+09:50:00.3 |
HIP 24177 |
32.64 |
| 2026-09-21 12:00 |
05:13:21.65 |
+09:49:49.6 |
HIP 24177 |
32.62 |
| 2026-09-22 00:00 |
05:13:21.05 |
+09:49:38.9 |
HIP 24177 |
32.59 |
| 2026-09-22 12:00 |
05:13:20.42 |
+09:49:28.2 |
HIP 24177 |
32.56 |
| 2026-09-23 00:00 |
05:13:19.76 |
+09:49:17.4 |
HIP 24177 |
32.52 |
| 2026-09-23 12:00 |
05:13:19.06 |
+09:49:06.6 |
HIP 24177 |
32.48 |
| 2026-09-24 00:00 |
05:13:18.33 |
+09:48:55.8 |
HIP 24177 |
32.43 |
| 2026-09-24 12:00 |
05:13:17.56 |
+09:48:45.0 |
HIP 24177 |
32.38 |
| 2026-09-25 00:00 |
05:13:16.76 |
+09:48:34.2 |
HIP 24177 |
32.32 |
| 2026-09-25 12:00 |
05:13:15.93 |
+09:48:23.3 |
HIP 24177 |
32.26 |
| 2026-09-26 00:00 |
05:13:15.07 |
+09:48:12.5 |
HIP 24177 |
32.20 |
| 2026-09-26 12:00 |
05:13:14.17 |
+09:48:01.6 |
HIP 24177 |
32.13 |
| 2026-09-27 00:00 |
05:13:13.24 |
+09:47:50.7 |
HIP 24177 |
32.05 |
| 2026-09-27 12:00 |
05:13:12.28 |
+09:47:39.7 |
HIP 24177 |
31.98 |
| 2026-09-28 00:00 |
05:13:11.28 |
+09:47:28.8 |
HIP 24177 |
31.90 |
| 2026-09-28 12:00 |
05:13:10.26 |
+09:47:17.9 |
HIP 24177 |
31.81 |
| 2026-09-29 00:00 |
05:13:09.19 |
+09:47:06.9 |
HIP 24177 |
31.73 |
| 2026-09-29 12:00 |
05:13:08.10 |
+09:46:56.0 |
HIP 24177 |
31.64 |
| 2026-09-30 00:00 |
05:13:06.97 |
+09:46:45.0 |
HIP 24177 |
31.54 |
| 2026-09-30 12:00 |
05:13:05.81 |
+09:46:34.0 |
HIP 24177 |
31.45 |
| 2026-10-01 00:00 |
05:13:04.62 |
+09:46:23.0 |
HIP 24177 |
31.35 |
| 2026-10-01 12:00 |
05:13:03.39 |
+09:46:12.0 |
HIP 24177 |
31.25 |
| 2026-10-02 00:00 |
05:13:02.14 |
+09:46:01.0 |
HIP 24177 |
31.15 |
| 2026-10-02 12:00 |
05:13:00.84 |
+09:45:50.0 |
HIP 24177 |
31.04 |
| 2026-10-03 00:00 |
05:12:59.52 |
+09:45:39.0 |
HIP 24177 |
30.94 |
| 2026-10-03 12:00 |
05:12:58.17 |
+09:45:27.9 |
HIP 24177 |
30.83 |
| 2026-10-04 00:00 |
05:12:56.78 |
+09:45:16.9 |
HIP 24177 |
30.72 |
| 2026-10-04 12:00 |
05:12:55.36 |
+09:45:05.9 |
HIP 24177 |
30.61 |
| 2026-10-05 00:00 |
05:12:53.90 |
+09:44:54.9 |
HIP 24177 |
30.50 |
| 2026-10-05 12:00 |
05:12:52.42 |
+09:44:43.9 |
HIP 24177 |
30.39 |
| 2026-10-06 00:00 |
05:12:50.90 |
+09:44:32.9 |
HIP 24177 |
30.27 |
| 2026-10-06 12:00 |
05:12:49.35 |
+09:44:21.8 |
HIP 24177 |
30.16 |
| 2026-10-07 00:00 |
05:12:47.77 |
+09:44:10.8 |
HIP 24177 |
30.05 |
| 2026-10-07 12:00 |
05:12:46.16 |
+09:43:59.8 |
HIP 24177 |
29.94 |
| 2026-10-08 00:00 |
05:12:44.51 |
+09:43:48.9 |
HIP 24177 |
29.83 |
| 2026-10-08 12:00 |
05:12:42.83 |
+09:43:37.9 |
HIP 24177 |
29.73 |
| 2026-10-09 00:00 |
05:12:41.13 |
+09:43:26.9 |
HIP 24177 |
29.62 |
| 2026-10-09 12:00 |
05:12:39.39 |
+09:43:15.9 |
HIP 24177 |
29.52 |
| 2026-10-10 00:00 |
05:12:37.61 |
+09:43:05.0 |
HIP 24177 |
29.42 |
| 2026-10-10 12:00 |
05:12:35.81 |
+09:42:54.0 |
HIP 24177 |
29.32 |
| 2026-10-11 00:00 |
05:12:33.98 |
+09:42:43.1 |
HIP 24177 |
29.22 |