P/2014 X1 (Elenin)
| Parameter |
Value |
| Designation |
P/2014 X1 (Elenin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-01-07T17:47:02.451840Z |
| Orbit solution date (soln_date, UTC) |
2024-10-10T18:10:33Z |
| Obs used |
630 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
6.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-01-31.0000000 |
| e |
0.71002420 |
| q (au) |
1.814883 |
| a (au) |
6.258740 |
| i (deg) |
25.971382 |
| Ω (om, deg) |
61.569156 |
| ω (w, deg) |
34.367877 |
| M (ma, deg) |
1.464080 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.535 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.535 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
| 2014-09-04 |
2015-01-06 |
+19.0602 |
-4.445 |
| 2015-01-08 |
2015-08-05 |
-12.9972 |
+2.834 |
| 2015-08-05 |
2016-03-15 |
+21.2797 |
-12.624 |
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 |
20:07:09.79 |
-39:46:12.2 |
HIP 99003 |
18.45 |
| 2026-02-03 12:00 |
20:07:27.57 |
-39:45:52.5 |
HIP 99185 |
18.21 |
| 2026-02-04 00:00 |
20:07:45.32 |
-39:45:33.2 |
HIP 99185 |
16.69 |
| 2026-02-04 12:00 |
20:08:03.05 |
-39:45:14.3 |
HIP 99185 |
15.79 |
| 2026-02-05 00:00 |
20:08:20.75 |
-39:44:55.8 |
HIP 99185 |
15.61 |
| 2026-02-05 12:00 |
20:08:38.43 |
-39:44:37.7 |
HIP 99185 |
16.17 |
| 2026-02-06 00:00 |
20:08:56.09 |
-39:44:20.0 |
HIP 99185 |
17.40 |
| 2026-02-06 12:00 |
20:09:13.72 |
-39:44:02.7 |
HIP 99185 |
19.17 |
| 2026-02-07 00:00 |
20:09:31.32 |
-39:43:45.9 |
HIP 99185 |
21.35 |
| 2026-02-07 12:00 |
20:09:48.90 |
-39:43:29.4 |
HIP 99185 |
23.81 |
| 2026-02-08 00:00 |
20:10:06.44 |
-39:43:13.4 |
HIP 99463 |
21.78 |
| 2026-02-08 12:00 |
20:10:23.96 |
-39:42:57.8 |
HIP 99463 |
19.73 |
| 2026-02-09 00:00 |
20:10:41.45 |
-39:42:42.6 |
HIP 99463 |
18.09 |
| 2026-02-09 12:00 |
20:10:58.91 |
-39:42:27.8 |
HIP 99463 |
16.98 |
| 2026-02-10 00:00 |
20:11:16.34 |
-39:42:13.5 |
HIP 99463 |
16.50 |
| 2026-02-10 12:00 |
20:11:33.74 |
-39:41:59.6 |
HIP 99463 |
16.71 |
| 2026-02-11 00:00 |
20:11:51.10 |
-39:41:46.1 |
HIP 99612 |
15.23 |
| 2026-02-11 12:00 |
20:12:08.44 |
-39:41:33.0 |
HIP 99612 |
12.52 |
| 2026-02-12 00:00 |
20:12:25.73 |
-39:41:20.4 |
HIP 99612 |
10.21 |
| 2026-02-12 12:00 |
20:12:43.00 |
-39:41:08.3 |
HIP 99612 |
8.60 |
| 2026-02-13 00:00 |
20:13:00.23 |
-39:40:56.6 |
HIP 99612 |
8.12 |
| 2026-02-13 12:00 |
20:13:17.42 |
-39:40:45.3 |
HIP 99612 |
8.96 |
| 2026-02-14 00:00 |
20:13:34.57 |
-39:40:34.5 |
HIP 99612 |
10.79 |
| 2026-02-14 12:00 |
20:13:51.69 |
-39:40:24.1 |
HIP 99612 |
13.21 |
| 2026-02-15 00:00 |
20:14:08.77 |
-39:40:14.2 |
HIP 99612 |
15.95 |
| 2026-02-15 12:00 |
20:14:25.81 |
-39:40:04.7 |
HIP 99612 |
18.86 |
| 2026-02-16 00:00 |
20:14:42.81 |
-39:39:55.7 |
HIP 99886 |
17.75 |
| 2026-02-16 12:00 |
20:14:59.77 |
-39:39:47.2 |
HIP 99886 |
15.14 |
| 2026-02-17 00:00 |
20:15:16.69 |
-39:39:39.1 |
HIP 99886 |
12.86 |
| 2026-02-17 12:00 |
20:15:33.56 |
-39:39:31.5 |
HIP 99886 |
11.09 |
| 2026-02-18 00:00 |
20:15:50.39 |
-39:39:24.4 |
HIP 99939 |
9.29 |
| 2026-02-18 12:00 |
20:16:07.18 |
-39:39:17.7 |
HIP 99939 |
6.09 |
| 2026-02-19 00:00 |
20:16:23.93 |
-39:39:11.5 |
HIP 99939 |
2.96 |
| 2026-02-19 12:00 |
20:16:40.62 |
-39:39:05.8 |
HIP 99939 |
1.12 |
| 2026-02-20 00:00 |
20:16:57.28 |
-39:39:00.6 |
HIP 99939 |
3.79 |
| 2026-02-20 12:00 |
20:17:13.88 |
-39:38:55.9 |
HIP 99939 |
6.93 |
| 2026-02-21 00:00 |
20:17:30.44 |
-39:38:51.6 |
HIP 99939 |
10.09 |
| 2026-02-21 12:00 |
20:17:46.94 |
-39:38:47.8 |
HIP 99939 |
13.26 |
| 2026-02-22 00:00 |
20:18:03.40 |
-39:38:44.5 |
HIP 99939 |
16.42 |
| 2026-02-22 12:00 |
20:18:19.81 |
-39:38:41.7 |
HIP 99939 |
19.58 |
| 2026-02-23 00:00 |
20:18:36.17 |
-39:38:39.4 |
HIP 99939 |
22.72 |
| 2026-02-23 12:00 |
20:18:52.48 |
-39:38:37.6 |
HIP 100238 |
21.41 |
| 2026-02-24 00:00 |
20:19:08.73 |
-39:38:36.3 |
HIP 100238 |
20.06 |