| Parameter |
Value |
| Designation |
C/2012 V2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-08-16T12:00:32.616000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:28Z |
| Obs used |
1054 |
| NEO |
- |
| M1 |
8.400 |
| K1 |
12.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-03-07.0000000 |
| e |
0.99762394 |
| q (au) |
1.454756 |
| a (au) |
612.254628 |
| i (deg) |
67.184787 |
| Ω (om, deg) |
262.164771 |
| ω (w, deg) |
217.323257 |
| M (ma, deg) |
359.989428 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.401 + 5.597\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.401 |
| n |
5.597 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.995 |
| 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 |
| 2012-10-30 |
2013-01-20 |
-3.2735 |
+1.646 |
| 2013-01-20 |
2013-03-25 |
-7.5578 |
+3.461 |
| 2013-03-25 |
2013-08-16 |
+13.2993 |
-4.446 |
| 2013-08-17 |
2013-11-06 |
+2.2762 |
-2.713 |
| 2013-11-06 |
2013-12-16 |
-9.8137 |
+1.381 |
| 2013-12-16 |
2014-05-16 |
+7.6762 |
-3.882 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
17:42:12.31 |
-11:59:40.5 |
HIP 86818 |
31.94 |
| 2026-07-29 12:00 |
17:42:09.26 |
-11:59:43.6 |
HIP 86818 |
32.68 |
| 2026-07-30 00:00 |
17:42:06.24 |
-11:59:46.9 |
HIP 86818 |
33.42 |
| 2026-07-30 12:00 |
17:42:03.24 |
-11:59:50.3 |
HIP 86818 |
34.15 |
| 2026-07-31 00:00 |
17:42:00.26 |
-11:59:53.7 |
HIP 86818 |
34.87 |
| 2026-07-31 12:00 |
17:41:57.31 |
-11:59:57.2 |
HIP 86818 |
35.59 |
| 2026-08-01 00:00 |
17:41:54.39 |
-12:00:00.8 |
HIP 86818 |
36.31 |
| 2026-08-01 12:00 |
17:41:51.49 |
-12:00:04.5 |
HIP 86818 |
37.01 |
| 2026-08-02 00:00 |
17:41:48.62 |
-12:00:08.3 |
HIP 86818 |
37.71 |
| 2026-08-02 12:00 |
17:41:45.77 |
-12:00:12.1 |
HIP 86818 |
38.41 |
| 2026-08-03 00:00 |
17:41:42.95 |
-12:00:16.0 |
HIP 86818 |
39.10 |
| 2026-08-03 12:00 |
17:41:40.15 |
-12:00:20.0 |
HIP 86818 |
39.78 |
| 2026-08-04 00:00 |
17:41:37.38 |
-12:00:24.1 |
HIP 86818 |
40.45 |
| 2026-08-04 12:00 |
17:41:34.64 |
-12:00:28.3 |
HIP 86452 |
40.79 |
| 2026-08-05 00:00 |
17:41:31.92 |
-12:00:32.5 |
HIP 86452 |
40.45 |
| 2026-08-05 12:00 |
17:41:29.23 |
-12:00:36.8 |
HIP 86452 |
40.12 |
| 2026-08-06 00:00 |
17:41:26.57 |
-12:00:41.2 |
HIP 86452 |
39.81 |
| 2026-08-06 12:00 |
17:41:23.93 |
-12:00:45.7 |
HIP 86452 |
39.50 |
| 2026-08-07 00:00 |
17:41:21.33 |
-12:00:50.2 |
HIP 86452 |
39.22 |
| 2026-08-07 12:00 |
17:41:18.75 |
-12:00:54.9 |
HIP 86452 |
38.94 |
| 2026-08-08 00:00 |
17:41:16.19 |
-12:00:59.6 |
HIP 86452 |
38.68 |
| 2026-08-08 12:00 |
17:41:13.67 |
-12:01:04.3 |
HIP 86452 |
38.43 |
| 2026-08-09 00:00 |
17:41:11.17 |
-12:01:09.2 |
HIP 86452 |
38.19 |
| 2026-08-09 12:00 |
17:41:08.71 |
-12:01:14.1 |
HIP 86452 |
37.97 |
| 2026-08-10 00:00 |
17:41:06.27 |
-12:01:19.1 |
HIP 86452 |
37.76 |
| 2026-08-10 12:00 |
17:41:03.86 |
-12:01:24.2 |
HIP 86452 |
37.56 |
| 2026-08-11 00:00 |
17:41:01.48 |
-12:01:29.3 |
HIP 86452 |
37.37 |
| 2026-08-11 12:00 |
17:40:59.12 |
-12:01:34.5 |
HIP 86452 |
37.20 |
| 2026-08-12 00:00 |
17:40:56.80 |
-12:01:39.8 |
HIP 86452 |
37.04 |
| 2026-08-12 12:00 |
17:40:54.51 |
-12:01:45.2 |
HIP 86452 |
36.89 |
| 2026-08-13 00:00 |
17:40:52.25 |
-12:01:50.6 |
HIP 86452 |
36.76 |
| 2026-08-13 12:00 |
17:40:50.01 |
-12:01:56.1 |
HIP 86452 |
36.63 |
| 2026-08-14 00:00 |
17:40:47.81 |
-12:02:01.6 |
HIP 86452 |
36.52 |
| 2026-08-14 12:00 |
17:40:45.64 |
-12:02:07.3 |
HIP 86452 |
36.42 |
| 2026-08-15 00:00 |
17:40:43.50 |
-12:02:13.0 |
HIP 86452 |
36.33 |
| 2026-08-15 12:00 |
17:40:41.39 |
-12:02:18.7 |
HIP 86452 |
36.25 |
| 2026-08-16 00:00 |
17:40:39.31 |
-12:02:24.6 |
HIP 86452 |
36.18 |
| 2026-08-16 12:00 |
17:40:37.26 |
-12:02:30.4 |
HIP 86452 |
36.13 |
| 2026-08-17 00:00 |
17:40:35.24 |
-12:02:36.4 |
HIP 86338 |
35.69 |
| 2026-08-17 12:00 |
17:40:33.26 |
-12:02:42.4 |
HIP 86338 |
35.23 |
| 2026-08-18 00:00 |
17:40:31.30 |
-12:02:48.5 |
HIP 86338 |
34.78 |
| 2026-08-18 12:00 |
17:40:29.38 |
-12:02:54.6 |
HIP 86338 |
34.33 |
| 2026-08-19 00:00 |
17:40:27.48 |
-12:03:00.8 |
HIP 86338 |
33.89 |