414P/STEREO
| Parameter |
Value |
| Designation |
414P/STEREO |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-01-25T07:45:13.775040Z |
| Orbit solution date (soln_date, UTC) |
2026-01-07T20:33:37Z |
| Obs used |
300 |
| NEO |
Yes |
| M1 |
20.500 |
| K1 |
39.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-01-04T02:11:29.184000Z |
| Discovery magnitude (MPC) |
19.10 R |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-11-22.0000000 |
| e |
0.81171958 |
| q (au) |
0.525961 |
| a (au) |
2.793500 |
| i (deg) |
23.392649 |
| Ω (om, deg) |
257.794317 |
| ω (w, deg) |
210.708294 |
| M (ma, deg) |
140.522045 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.866 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.866 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2025-07-28 |
2025-09-23 |
+7.5590 |
+0.225 |
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 |
17:29:54.24 |
-28:48:44.9 |
HIP 85613 |
10.95 |
| 2026-02-03 12:00 |
17:30:37.71 |
-28:48:04.0 |
HIP 85712 |
15.12 |
| 2026-02-04 00:00 |
17:31:20.86 |
-28:47:22.4 |
HIP 85712 |
16.40 |
| 2026-02-04 12:00 |
17:32:03.69 |
-28:46:40.0 |
HIP 85928 |
22.06 |
| 2026-02-05 00:00 |
17:32:46.20 |
-28:45:56.9 |
HIP 85928 |
14.40 |
| 2026-02-05 12:00 |
17:33:28.38 |
-28:45:13.1 |
HIP 85928 |
10.14 |
| 2026-02-06 00:00 |
17:34:10.25 |
-28:44:28.5 |
HIP 85928 |
13.01 |
| 2026-02-06 12:00 |
17:34:51.79 |
-28:43:43.3 |
HIP 85928 |
20.08 |
| 2026-02-07 00:00 |
17:35:33.00 |
-28:42:57.4 |
HIP 86149 |
13.04 |
| 2026-02-07 12:00 |
17:36:13.89 |
-28:42:10.8 |
HIP 86149 |
7.90 |
| 2026-02-08 00:00 |
17:36:54.46 |
-28:41:23.5 |
HIP 86149 |
10.76 |
| 2026-02-08 12:00 |
17:37:34.70 |
-28:40:35.6 |
HIP 86276 |
2.52 |
| 2026-02-09 00:00 |
17:38:14.61 |
-28:39:47.0 |
HIP 86276 |
7.06 |
| 2026-02-09 12:00 |
17:38:54.19 |
-28:38:57.8 |
HIP 86376 |
14.29 |
| 2026-02-10 00:00 |
17:39:33.44 |
-28:38:08.0 |
HIP 86376 |
15.20 |
| 2026-02-10 12:00 |
17:40:12.37 |
-28:37:17.6 |
HIP 86487 |
18.27 |
| 2026-02-11 00:00 |
17:40:50.96 |
-28:36:26.6 |
HIP 86487 |
19.86 |
| 2026-02-11 12:00 |
17:41:29.22 |
-28:35:35.0 |
HIP 86672 |
16.34 |
| 2026-02-12 00:00 |
17:42:07.15 |
-28:34:42.8 |
HIP 86672 |
11.41 |
| 2026-02-12 12:00 |
17:42:44.74 |
-28:33:50.0 |
HIP 86672 |
11.53 |
| 2026-02-13 00:00 |
17:43:22.00 |
-28:32:56.7 |
HIP 86672 |
16.49 |
| 2026-02-13 12:00 |
17:43:58.92 |
-28:32:02.9 |
HIP 86898 |
19.19 |
| 2026-02-14 00:00 |
17:44:35.51 |
-28:31:08.5 |
HIP 86898 |
11.50 |
| 2026-02-14 12:00 |
17:45:11.76 |
-28:30:13.6 |
HIP 86898 |
5.24 |
| 2026-02-15 00:00 |
17:45:47.67 |
-28:29:18.2 |
HIP 86919 |
5.37 |
| 2026-02-15 12:00 |
17:46:23.23 |
-28:28:22.3 |
HIP 86919 |
10.83 |
| 2026-02-16 00:00 |
17:46:58.46 |
-28:27:25.8 |
HIP 87109 |
15.91 |
| 2026-02-16 12:00 |
17:47:33.34 |
-28:26:28.9 |
HIP 87109 |
12.02 |
| 2026-02-17 00:00 |
17:48:07.88 |
-28:25:31.6 |
HIP 87109 |
12.44 |
| 2026-02-17 12:00 |
17:48:42.08 |
-28:24:33.7 |
HIP 87109 |
16.75 |
| 2026-02-18 00:00 |
17:49:15.92 |
-28:23:35.4 |
HIP 87109 |
22.78 |
| 2026-02-18 12:00 |
17:49:49.42 |
-28:22:36.7 |
HIP 87429 |
28.74 |
| 2026-02-19 00:00 |
17:50:22.57 |
-28:21:37.5 |
HIP 87429 |
21.45 |
| 2026-02-19 12:00 |
17:50:55.38 |
-28:20:37.9 |
HIP 87429 |
14.31 |
| 2026-02-20 00:00 |
17:51:27.83 |
-28:19:37.9 |
HIP 87429 |
7.52 |
| 2026-02-20 12:00 |
17:51:59.93 |
-28:18:37.4 |
HIP 87429 |
3.52 |
| 2026-02-21 00:00 |
17:52:31.67 |
-28:17:36.6 |
HIP 87429 |
8.31 |
| 2026-02-21 12:00 |
17:53:03.06 |
-28:16:35.4 |
HIP 87429 |
14.94 |
| 2026-02-22 00:00 |
17:53:34.10 |
-28:15:33.8 |
HIP 87684 |
15.21 |
| 2026-02-22 12:00 |
17:54:04.78 |
-28:14:31.8 |
HIP 87684 |
9.14 |
| 2026-02-23 00:00 |
17:54:35.10 |
-28:13:29.4 |
HIP 87684 |
5.39 |
| 2026-02-23 12:00 |
17:55:05.07 |
-28:12:26.7 |
HIP 87684 |
8.06 |
| 2026-02-24 00:00 |
17:55:34.67 |
-28:11:23.7 |
HIP 87684 |
13.72 |