C/2011 F1 (LINEAR)
| 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
$$
M_a = (12.405 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.405 |
| 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 |
+1.1828 |
-0.946 |
| 2013-03-19 |
2014-08-07 |
+5.5010 |
-0.922 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
04:58:18.12 |
+08:55:03.5 |
HIP 23153 |
9.27 |
| 2026-02-03 12:00 |
04:58:16.06 |
+08:55:16.2 |
HIP 23153 |
9.67 |
| 2026-02-04 00:00 |
04:58:14.03 |
+08:55:28.9 |
HIP 23153 |
10.08 |
| 2026-02-04 12:00 |
04:58:12.03 |
+08:55:41.8 |
HIP 23153 |
10.50 |
| 2026-02-05 00:00 |
04:58:10.06 |
+08:55:54.8 |
HIP 23153 |
10.91 |
| 2026-02-05 12:00 |
04:58:08.13 |
+08:56:07.9 |
HIP 23153 |
11.33 |
| 2026-02-06 00:00 |
04:58:06.23 |
+08:56:21.1 |
HIP 23153 |
11.75 |
| 2026-02-06 12:00 |
04:58:04.36 |
+08:56:34.4 |
HIP 23153 |
12.17 |
| 2026-02-07 00:00 |
04:58:02.53 |
+08:56:47.8 |
HIP 23153 |
12.58 |
| 2026-02-07 12:00 |
04:58:00.72 |
+08:57:01.3 |
HIP 23075 |
12.90 |
| 2026-02-08 00:00 |
04:57:58.95 |
+08:57:14.9 |
HIP 23075 |
13.07 |
| 2026-02-08 12:00 |
04:57:57.22 |
+08:57:28.6 |
HIP 23075 |
13.27 |
| 2026-02-09 00:00 |
04:57:55.52 |
+08:57:42.4 |
HIP 23075 |
13.47 |
| 2026-02-09 12:00 |
04:57:53.85 |
+08:57:56.3 |
HIP 23075 |
13.69 |
| 2026-02-10 00:00 |
04:57:52.21 |
+08:58:10.3 |
HIP 23075 |
13.93 |
| 2026-02-10 12:00 |
04:57:50.61 |
+08:58:24.4 |
HIP 23075 |
14.18 |
| 2026-02-11 00:00 |
04:57:49.04 |
+08:58:38.5 |
HIP 23075 |
14.44 |
| 2026-02-11 12:00 |
04:57:47.51 |
+08:58:52.8 |
HIP 23075 |
14.71 |
| 2026-02-12 00:00 |
04:57:46.01 |
+08:59:07.2 |
HIP 23075 |
14.99 |
| 2026-02-12 12:00 |
04:57:44.54 |
+08:59:21.6 |
HIP 23075 |
15.28 |
| 2026-02-13 00:00 |
04:57:43.11 |
+08:59:36.1 |
HIP 23075 |
15.57 |
| 2026-02-13 12:00 |
04:57:41.72 |
+08:59:50.8 |
HIP 23075 |
15.87 |
| 2026-02-14 00:00 |
04:57:40.35 |
+09:00:05.5 |
HIP 23075 |
16.18 |
| 2026-02-14 12:00 |
04:57:39.03 |
+09:00:20.3 |
HIP 23075 |
16.49 |
| 2026-02-15 00:00 |
04:57:37.74 |
+09:00:35.2 |
HIP 23075 |
16.80 |
| 2026-02-15 12:00 |
04:57:36.48 |
+09:00:50.2 |
HIP 23075 |
17.12 |
| 2026-02-16 00:00 |
04:57:35.25 |
+09:01:05.2 |
HIP 22984 |
17.30 |
| 2026-02-16 12:00 |
04:57:34.07 |
+09:01:20.4 |
HIP 22984 |
17.26 |
| 2026-02-17 00:00 |
04:57:32.91 |
+09:01:35.6 |
HIP 22984 |
17.24 |
| 2026-02-17 12:00 |
04:57:31.80 |
+09:01:50.9 |
HIP 22984 |
17.23 |
| 2026-02-18 00:00 |
04:57:30.71 |
+09:02:06.3 |
HIP 22984 |
17.24 |
| 2026-02-18 12:00 |
04:57:29.67 |
+09:02:21.7 |
HIP 22984 |
17.26 |
| 2026-02-19 00:00 |
04:57:28.66 |
+09:02:37.3 |
HIP 22984 |
17.29 |
| 2026-02-19 12:00 |
04:57:27.68 |
+09:02:52.9 |
HIP 22984 |
17.34 |
| 2026-02-20 00:00 |
04:57:26.74 |
+09:03:08.6 |
HIP 22984 |
17.40 |
| 2026-02-20 12:00 |
04:57:25.83 |
+09:03:24.4 |
HIP 22984 |
17.48 |
| 2026-02-21 00:00 |
04:57:24.96 |
+09:03:40.2 |
HIP 22984 |
17.57 |
| 2026-02-21 12:00 |
04:57:24.13 |
+09:03:56.1 |
HIP 22984 |
17.67 |
| 2026-02-22 00:00 |
04:57:23.33 |
+09:04:12.1 |
HIP 22984 |
17.78 |
| 2026-02-22 12:00 |
04:57:22.56 |
+09:04:28.2 |
HIP 22984 |
17.90 |
| 2026-02-23 00:00 |
04:57:21.84 |
+09:04:44.3 |
HIP 22984 |
18.03 |
| 2026-02-23 12:00 |
04:57:21.14 |
+09:05:00.5 |
HIP 22984 |
18.18 |
| 2026-02-24 00:00 |
04:57:20.49 |
+09:05:16.7 |
HIP 22984 |
18.33 |