| Parameter |
Value |
| Designation |
126P/IRAS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-07-05T08:31:56.219520Z |
| Orbit solution date (soln_date, UTC) |
2025-10-30T09:34:36Z |
| Obs used |
1717 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
11.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-05-27.0000000 |
| e |
0.69627539 |
| q (au) |
1.713008 |
| a (au) |
5.640004 |
| i (deg) |
45.869371 |
| Ω (om, deg) |
357.862226 |
| ω (w, deg) |
356.523683 |
| M (ma, deg) |
303.387535 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.785 + 5.260\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.785 |
| n |
5.260 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.992 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
10:23:09.84 |
+34:47:14.5 |
HIP 50968 |
22.44 |
| 2026-06-01 12:00 |
10:23:14.41 |
+34:44:38.5 |
HIP 50968 |
23.36 |
| 2026-06-02 00:00 |
10:23:19.11 |
+34:42:02.4 |
HIP 50968 |
24.54 |
| 2026-06-02 12:00 |
10:23:23.95 |
+34:39:26.0 |
HIP 50968 |
25.95 |
| 2026-06-03 00:00 |
10:23:28.92 |
+34:36:49.5 |
HIP 50929 |
26.37 |
| 2026-06-03 12:00 |
10:23:34.01 |
+34:34:12.9 |
HIP 50929 |
23.57 |
| 2026-06-04 00:00 |
10:23:39.24 |
+34:31:36.1 |
HIP 50929 |
20.76 |
| 2026-06-04 12:00 |
10:23:44.59 |
+34:28:59.1 |
HIP 50929 |
17.95 |
| 2026-06-05 00:00 |
10:23:50.07 |
+34:26:22.0 |
HIP 50929 |
15.14 |
| 2026-06-05 12:00 |
10:23:55.67 |
+34:23:44.8 |
HIP 50929 |
12.34 |
| 2026-06-06 00:00 |
10:24:01.41 |
+34:21:07.4 |
HIP 50929 |
9.58 |
| 2026-06-06 12:00 |
10:24:07.26 |
+34:18:29.8 |
HIP 50929 |
6.91 |
| 2026-06-07 00:00 |
10:24:13.24 |
+34:15:52.2 |
HIP 50929 |
4.52 |
| 2026-06-07 12:00 |
10:24:19.35 |
+34:13:14.4 |
HIP 50951 |
2.72 |
| 2026-06-08 00:00 |
10:24:25.58 |
+34:10:36.5 |
HIP 50951 |
0.70 |
| 2026-06-08 12:00 |
10:24:31.93 |
+34:07:58.5 |
HIP 50951 |
3.30 |
| 2026-06-09 00:00 |
10:24:38.39 |
+34:05:20.4 |
HIP 50951 |
6.23 |
| 2026-06-09 12:00 |
10:24:44.98 |
+34:02:42.2 |
HIP 50951 |
9.19 |
| 2026-06-10 00:00 |
10:24:51.69 |
+34:00:03.9 |
HIP 50951 |
12.17 |
| 2026-06-10 12:00 |
10:24:58.52 |
+33:57:25.5 |
HIP 50951 |
15.16 |
| 2026-06-11 00:00 |
10:25:05.47 |
+33:54:47.0 |
HIP 51056 |
12.42 |
| 2026-06-11 12:00 |
10:25:12.53 |
+33:52:08.4 |
HIP 51056 |
9.82 |
| 2026-06-12 00:00 |
10:25:19.71 |
+33:49:29.8 |
HIP 51056 |
7.50 |
| 2026-06-12 12:00 |
10:25:27.01 |
+33:46:51.1 |
HIP 51056 |
5.86 |
| 2026-06-13 00:00 |
10:25:34.41 |
+33:44:12.3 |
HIP 51056 |
5.55 |
| 2026-06-13 12:00 |
10:25:41.94 |
+33:41:33.4 |
HIP 51056 |
6.77 |
| 2026-06-14 00:00 |
10:25:49.57 |
+33:38:54.5 |
HIP 51056 |
8.93 |
| 2026-06-14 12:00 |
10:25:57.32 |
+33:36:15.6 |
HIP 51056 |
11.53 |
| 2026-06-15 00:00 |
10:26:05.18 |
+33:33:36.6 |
HIP 51056 |
14.33 |
| 2026-06-15 12:00 |
10:26:13.15 |
+33:30:57.6 |
HIP 51033 |
14.87 |
| 2026-06-16 00:00 |
10:26:21.23 |
+33:28:18.5 |
HIP 51033 |
13.87 |
| 2026-06-16 12:00 |
10:26:29.42 |
+33:25:39.4 |
HIP 51033 |
13.56 |
| 2026-06-17 00:00 |
10:26:37.71 |
+33:23:00.3 |
HIP 51033 |
13.99 |
| 2026-06-17 12:00 |
10:26:46.12 |
+33:20:21.2 |
HIP 51033 |
15.12 |
| 2026-06-18 00:00 |
10:26:54.62 |
+33:17:42.1 |
HIP 51033 |
16.80 |
| 2026-06-18 12:00 |
10:27:03.24 |
+33:15:02.9 |
HIP 51205 |
14.03 |
| 2026-06-19 00:00 |
10:27:11.95 |
+33:12:23.8 |
HIP 51205 |
10.85 |
| 2026-06-19 12:00 |
10:27:20.77 |
+33:09:44.7 |
HIP 51205 |
7.70 |
| 2026-06-20 00:00 |
10:27:29.69 |
+33:07:05.6 |
HIP 51205 |
4.66 |
| 2026-06-20 12:00 |
10:27:38.71 |
+33:04:26.5 |
HIP 51205 |
2.27 |
| 2026-06-21 00:00 |
10:27:47.84 |
+33:01:47.4 |
HIP 51205 |
3.16 |
| 2026-06-21 12:00 |
10:27:57.06 |
+32:59:08.3 |
HIP 51205 |
6.03 |
| 2026-06-22 00:00 |
10:28:06.37 |
+32:56:29.3 |
HIP 51205 |
9.20 |