| Parameter |
Value |
| Designation |
C/2010 S1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-05-20T07:54:44.360640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:47Z |
| Obs used |
8511 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
6.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-10-29.0000000 |
| e |
1.00124864 |
| q (au) |
5.899919 |
| a (au) |
-4725.086529 |
| i (deg) |
125.335283 |
| Ω (om, deg) |
93.432292 |
| ω (w, deg) |
118.617187 |
| M (ma, deg) |
-0.000617 |
Magnitude
Scatter + Global Linear
$$
M_a = (1.804 + 4.182\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
1.804 |
| n |
4.182 |
| gf |
1.000 |
| gb |
-0.829 |
| k |
1.000 |
| δ90 |
9.997 |
| 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 |
| 2010-09-21 |
2011-08-06 |
+19.8672 |
-18.185 |
| 2011-08-06 |
2013-05-20 |
-7.0625 |
+5.448 |
| 2013-05-21 |
2014-07-27 |
+22.0488 |
-17.120 |
| 2014-07-27 |
2015-09-15 |
-9.4589 |
+8.899 |
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 |
13:24:00.50 |
-61:03:03.6 |
HIP 65271 |
10.68 |
| 2026-03-26 12:00 |
13:23:50.83 |
-61:03:05.7 |
HIP 65271 |
9.60 |
| 2026-03-27 00:00 |
13:23:41.14 |
-61:03:07.2 |
HIP 65271 |
8.55 |
| 2026-03-27 12:00 |
13:23:31.42 |
-61:03:08.2 |
HIP 65271 |
7.52 |
| 2026-03-28 00:00 |
13:23:21.69 |
-61:03:08.7 |
HIP 65271 |
6.54 |
| 2026-03-28 12:00 |
13:23:11.93 |
-61:03:08.6 |
HIP 65271 |
5.63 |
| 2026-03-29 00:00 |
13:23:02.15 |
-61:03:08.0 |
HIP 65271 |
4.82 |
| 2026-03-29 12:00 |
13:22:52.35 |
-61:03:06.9 |
HIP 65271 |
4.19 |
| 2026-03-30 00:00 |
13:22:42.53 |
-61:03:05.2 |
HIP 65271 |
3.83 |
| 2026-03-30 12:00 |
13:22:32.70 |
-61:03:03.0 |
HIP 65271 |
3.80 |
| 2026-03-31 00:00 |
13:22:22.84 |
-61:03:00.3 |
HIP 65271 |
4.13 |
| 2026-03-31 12:00 |
13:22:12.97 |
-61:02:57.0 |
HIP 65271 |
4.74 |
| 2026-04-01 00:00 |
13:22:03.09 |
-61:02:53.2 |
HIP 65271 |
5.54 |
| 2026-04-01 12:00 |
13:21:53.19 |
-61:02:48.9 |
HIP 65271 |
6.46 |
| 2026-04-02 00:00 |
13:21:43.27 |
-61:02:44.1 |
HIP 65271 |
7.46 |
| 2026-04-02 12:00 |
13:21:33.34 |
-61:02:38.7 |
HIP 65271 |
8.51 |
| 2026-04-03 00:00 |
13:21:23.40 |
-61:02:32.7 |
HIP 65271 |
9.60 |
| 2026-04-03 12:00 |
13:21:13.44 |
-61:02:26.3 |
HIP 65271 |
10.71 |
| 2026-04-04 00:00 |
13:21:03.48 |
-61:02:19.3 |
HIP 65271 |
11.84 |
| 2026-04-04 12:00 |
13:20:53.50 |
-61:02:11.8 |
HIP 65271 |
12.98 |
| 2026-04-05 00:00 |
13:20:43.52 |
-61:02:03.8 |
HIP 65271 |
14.14 |
| 2026-04-05 12:00 |
13:20:33.52 |
-61:01:55.2 |
HIP 65186 |
15.15 |
| 2026-04-06 00:00 |
13:20:23.52 |
-61:01:46.1 |
HIP 65186 |
15.63 |
| 2026-04-06 12:00 |
13:20:13.51 |
-61:01:36.5 |
HIP 65186 |
16.18 |
| 2026-04-07 00:00 |
13:20:03.49 |
-61:01:26.3 |
HIP 64877 |
15.53 |
| 2026-04-07 12:00 |
13:19:53.47 |
-61:01:15.6 |
HIP 64877 |
14.31 |
| 2026-04-08 00:00 |
13:19:43.45 |
-61:01:04.4 |
HIP 64877 |
13.09 |
| 2026-04-08 12:00 |
13:19:33.42 |
-61:00:52.7 |
HIP 64877 |
11.87 |
| 2026-04-09 00:00 |
13:19:23.38 |
-61:00:40.4 |
HIP 64877 |
10.65 |
| 2026-04-09 12:00 |
13:19:13.35 |
-61:00:27.6 |
HIP 64877 |
9.44 |
| 2026-04-10 00:00 |
13:19:03.31 |
-61:00:14.3 |
HIP 64877 |
8.23 |
| 2026-04-10 12:00 |
13:18:53.27 |
-61:00:00.5 |
HIP 64877 |
7.03 |
| 2026-04-11 00:00 |
13:18:43.24 |
-60:59:46.1 |
HIP 64877 |
5.86 |
| 2026-04-11 12:00 |
13:18:33.20 |
-60:59:31.3 |
HIP 64877 |
4.71 |
| 2026-04-12 00:00 |
13:18:23.16 |
-60:59:15.9 |
HIP 64877 |
3.63 |
| 2026-04-12 12:00 |
13:18:13.13 |
-60:59:00.0 |
HIP 64877 |
2.70 |
| 2026-04-13 00:00 |
13:18:03.10 |
-60:58:43.5 |
HIP 64877 |
2.13 |
| 2026-04-13 12:00 |
13:17:53.08 |
-60:58:26.6 |
HIP 64877 |
2.22 |
| 2026-04-14 00:00 |
13:17:43.06 |
-60:58:09.1 |
HIP 64877 |
2.91 |
| 2026-04-14 12:00 |
13:17:33.05 |
-60:57:51.1 |
HIP 64877 |
3.90 |
| 2026-04-15 00:00 |
13:17:23.04 |
-60:57:32.6 |
HIP 64877 |
5.01 |
| 2026-04-15 12:00 |
13:17:13.04 |
-60:57:13.6 |
HIP 64877 |
6.18 |
| 2026-04-16 00:00 |
13:17:03.05 |
-60:56:54.1 |
HIP 64877 |
7.38 |