210P/Christensen
Metadata
| Parameter | Value |
|---|---|
| Designation | 210P/Christensen |
| Type | P |
| Perihelion (tp_cal, UTC) | 2025-11-22T17:07:45.071040Z |
| Orbit solution date (soln_date, UTC) | 2026-03-31T14:13:57Z |
| Obs used | 201 |
| NEO | Yes |
| M1 | 14.100 |
| K1 | 16.000 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2024-08-26.0000000 |
| e | 0.83404396 |
| q (au) | 0.524716 |
| a (au) | 3.161775 |
| i (deg) | 10.286301 |
| Ω (om, deg) | 93.798058 |
| ω (w, deg) | 345.931160 |
| M (ma, deg) | 280.459288 |
Magnitude
Scatter + Global Linear
$$ M_a = (16.169 + 5.925\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 16.169 |
| n | 5.925 |
| gf | 0.800 |
| gb | -0.500 |
| k | 0.800 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 2025-07-19 | 2025-08-18 | -16.4991 | +4.851 |
| 2025-08-18 | 2025-11-04 | +1.4172 | +0.492 |
| 2025-11-26 | 2026-03-24 | -4.7677 | -2.150 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 15:26:33.38 | -02:41:08.6 | HIP 75685 | 17.79 |
| 2026-03-26 12:00 | 15:25:49.78 | -02:37:01.1 | HIP 75456 | 26.66 |
| 2026-03-27 00:00 | 15:25:05.71 | -02:32:53.9 | HIP 75456 | 18.97 |
| 2026-03-27 12:00 | 15:24:21.17 | -02:28:47.1 | HIP 75456 | 16.95 |
| 2026-03-28 00:00 | 15:23:36.19 | -02:24:40.7 | HIP 75311 | 22.20 |
| 2026-03-28 12:00 | 15:22:50.75 | -02:20:34.7 | HIP 75311 | 25.96 |
| 2026-03-29 00:00 | 15:22:04.89 | -02:16:29.3 | HIP 75101 | 21.11 |
| 2026-03-29 12:00 | 15:21:18.60 | -02:12:24.6 | HIP 75101 | 14.65 |
| 2026-03-30 00:00 | 15:20:31.90 | -02:08:20.4 | HIP 75101 | 16.87 |
| 2026-03-30 12:00 | 15:19:44.80 | -02:04:17.0 | HIP 74972 | 9.48 |
| 2026-03-31 00:00 | 15:18:57.31 | -02:00:14.4 | HIP 74972 | 10.70 |
| 2026-03-31 12:00 | 15:18:09.45 | -01:56:12.7 | HIP 74889 | 20.40 |
| 2026-04-01 00:00 | 15:17:21.21 | -01:52:11.8 | HIP 74889 | 21.48 |
| 2026-04-01 12:00 | 15:16:32.63 | -01:48:12.0 | HIP 74889 | 28.89 |
| 2026-04-02 00:00 | 15:15:43.70 | -01:44:13.2 | HIP 74558 | 27.07 |
| 2026-04-02 12:00 | 15:14:54.43 | -01:40:15.4 | HIP 74558 | 18.50 |
| 2026-04-03 00:00 | 15:14:04.85 | -01:36:18.9 | HIP 74510 | 8.38 |
| 2026-04-03 12:00 | 15:13:14.96 | -01:32:23.6 | HIP 74502 | 7.06 |
| 2026-04-04 00:00 | 15:12:24.77 | -01:28:29.5 | HIP 74502 | 19.03 |
| 2026-04-04 12:00 | 15:11:34.31 | -01:24:36.8 | HIP 74443 | 23.51 |
| 2026-04-05 00:00 | 15:10:43.57 | -01:20:45.6 | HIP 74164 | 25.08 |
| 2026-04-05 12:00 | 15:09:52.57 | -01:16:55.8 | HIP 74164 | 17.77 |
| 2026-04-06 00:00 | 15:09:01.33 | -01:13:07.5 | HIP 74106 | 15.00 |
| 2026-04-06 12:00 | 15:08:09.86 | -01:09:20.9 | HIP 74106 | 13.38 |
| 2026-04-07 00:00 | 15:07:18.16 | -01:05:35.9 | HIP 74106 | 22.25 |
| 2026-04-07 12:00 | 15:06:26.27 | -01:01:52.7 | HIP 73853 | 21.04 |
| 2026-04-08 00:00 | 15:05:34.18 | -00:58:11.2 | HIP 73853 | 13.40 |
| 2026-04-08 12:00 | 15:04:41.91 | -00:54:31.6 | HIP 73741 | 4.36 |
| 2026-04-09 00:00 | 15:03:49.47 | -00:50:53.9 | HIP 73741 | 9.40 |
| 2026-04-09 12:00 | 15:02:56.88 | -00:47:18.2 | HIP 73741 | 23.00 |
| 2026-04-10 00:00 | 15:02:04.16 | -00:43:44.6 | HIP 73496 | 22.50 |
| 2026-04-10 12:00 | 15:01:11.31 | -00:40:13.0 | HIP 73496 | 23.15 |
| 2026-04-11 00:00 | 15:00:18.35 | -00:36:43.5 | HIP 73317 | 26.10 |
| 2026-04-11 12:00 | 14:59:25.29 | -00:33:16.3 | HIP 73317 | 14.62 |
| 2026-04-12 00:00 | 14:58:32.14 | -00:29:51.4 | HIP 73317 | 11.10 |
| 2026-04-12 12:00 | 14:57:38.93 | -00:26:28.8 | HIP 73193 | 16.49 |
| 2026-04-13 00:00 | 14:56:45.67 | -00:23:08.6 | HIP 73193 | 17.68 |
| 2026-04-13 12:00 | 14:55:52.36 | -00:19:50.8 | HIP 73124 | 22.21 |
| 2026-04-14 00:00 | 14:54:59.02 | -00:16:35.5 | HIP 72888 | 18.95 |
| 2026-04-14 12:00 | 14:54:05.67 | -00:13:22.7 | HIP 72888 | 11.64 |
| 2026-04-15 00:00 | 14:53:12.32 | -00:10:12.6 | HIP 72888 | 16.95 |
| 2026-04-15 12:00 | 14:52:18.99 | -00:07:05.1 | HIP 72766 | 14.06 |
| 2026-04-16 00:00 | 14:51:25.68 | -00:04:00.3 | HIP 72635 | 6.26 |