| 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) |
| 2026-09-20 00:00 |
17:39:35.81 |
-12:11:09.3 |
HIP 86338 |
18.87 |
| 2026-09-20 12:00 |
17:39:36.12 |
-12:11:17.8 |
HIP 86338 |
18.85 |
| 2026-09-21 00:00 |
17:39:36.47 |
-12:11:26.3 |
HIP 86338 |
18.84 |
| 2026-09-21 12:00 |
17:39:36.85 |
-12:11:34.8 |
HIP 86338 |
18.84 |
| 2026-09-22 00:00 |
17:39:37.27 |
-12:11:43.3 |
HIP 86338 |
18.84 |
| 2026-09-22 12:00 |
17:39:37.72 |
-12:11:51.8 |
HIP 86338 |
18.86 |
| 2026-09-23 00:00 |
17:39:38.20 |
-12:12:00.4 |
HIP 86338 |
18.88 |
| 2026-09-23 12:00 |
17:39:38.72 |
-12:12:08.9 |
HIP 86338 |
18.92 |
| 2026-09-24 00:00 |
17:39:39.28 |
-12:12:17.5 |
HIP 86338 |
18.96 |
| 2026-09-24 12:00 |
17:39:39.86 |
-12:12:26.0 |
HIP 86338 |
19.01 |
| 2026-09-25 00:00 |
17:39:40.48 |
-12:12:34.5 |
HIP 86338 |
19.07 |
| 2026-09-25 12:00 |
17:39:41.14 |
-12:12:43.1 |
HIP 86338 |
19.14 |
| 2026-09-26 00:00 |
17:39:41.83 |
-12:12:51.6 |
HIP 86338 |
19.22 |
| 2026-09-26 12:00 |
17:39:42.55 |
-12:13:00.2 |
HIP 86338 |
19.30 |
| 2026-09-27 00:00 |
17:39:43.31 |
-12:13:08.7 |
HIP 86338 |
19.40 |
| 2026-09-27 12:00 |
17:39:44.10 |
-12:13:17.2 |
HIP 86338 |
19.51 |
| 2026-09-28 00:00 |
17:39:44.92 |
-12:13:25.8 |
HIP 86338 |
19.63 |
| 2026-09-28 12:00 |
17:39:45.78 |
-12:13:34.3 |
HIP 86338 |
19.76 |
| 2026-09-29 00:00 |
17:39:46.67 |
-12:13:42.8 |
HIP 86338 |
19.89 |
| 2026-09-29 12:00 |
17:39:47.59 |
-12:13:51.3 |
HIP 86338 |
20.04 |
| 2026-09-30 00:00 |
17:39:48.55 |
-12:13:59.8 |
HIP 86338 |
20.20 |
| 2026-09-30 12:00 |
17:39:49.54 |
-12:14:08.3 |
HIP 86338 |
20.36 |
| 2026-10-01 00:00 |
17:39:50.57 |
-12:14:16.8 |
HIP 86338 |
20.54 |
| 2026-10-01 12:00 |
17:39:51.62 |
-12:14:25.3 |
HIP 86338 |
20.73 |
| 2026-10-02 00:00 |
17:39:52.72 |
-12:14:33.8 |
HIP 86338 |
20.92 |
| 2026-10-02 12:00 |
17:39:53.84 |
-12:14:42.3 |
HIP 86338 |
21.13 |
| 2026-10-03 00:00 |
17:39:55.00 |
-12:14:50.7 |
HIP 86338 |
21.35 |
| 2026-10-03 12:00 |
17:39:56.18 |
-12:14:59.2 |
HIP 86338 |
21.58 |
| 2026-10-04 00:00 |
17:39:57.41 |
-12:15:07.6 |
HIP 86338 |
21.81 |
| 2026-10-04 12:00 |
17:39:58.66 |
-12:15:16.0 |
HIP 86338 |
22.06 |
| 2026-10-05 00:00 |
17:39:59.95 |
-12:15:24.4 |
HIP 86338 |
22.32 |
| 2026-10-05 12:00 |
17:40:01.27 |
-12:15:32.8 |
HIP 86338 |
22.59 |
| 2026-10-06 00:00 |
17:40:02.62 |
-12:15:41.2 |
HIP 86338 |
22.86 |
| 2026-10-06 12:00 |
17:40:04.01 |
-12:15:49.5 |
HIP 86338 |
23.15 |
| 2026-10-07 00:00 |
17:40:05.43 |
-12:15:57.9 |
HIP 86338 |
23.45 |
| 2026-10-07 12:00 |
17:40:06.88 |
-12:16:06.2 |
HIP 86338 |
23.76 |
| 2026-10-08 00:00 |
17:40:08.36 |
-12:16:14.5 |
HIP 86338 |
24.07 |
| 2026-10-08 12:00 |
17:40:09.87 |
-12:16:22.7 |
HIP 86338 |
24.40 |
| 2026-10-09 00:00 |
17:40:11.42 |
-12:16:31.0 |
HIP 86338 |
24.74 |
| 2026-10-09 12:00 |
17:40:13.00 |
-12:16:39.2 |
HIP 86338 |
25.08 |
| 2026-10-10 00:00 |
17:40:14.61 |
-12:16:47.4 |
HIP 86338 |
25.44 |
| 2026-10-10 12:00 |
17:40:16.25 |
-12:16:55.6 |
HIP 86338 |
25.80 |
| 2026-10-11 00:00 |
17:40:17.92 |
-12:17:03.7 |
HIP 86338 |
26.18 |