127P/Holt-Olmstead
| Parameter |
Value |
| Designation |
127P/Holt-Olmstead |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-03-17T19:51:44.164800Z |
| Orbit solution date (soln_date, UTC) |
2024-09-03T09:11:00Z |
| Obs used |
909 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
20.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-09-02.0000000 |
| e |
0.36073296 |
| q (au) |
2.205847 |
| a (au) |
3.450587 |
| i (deg) |
14.302120 |
| Ω (om, deg) |
13.650998 |
| ω (w, deg) |
6.713930 |
| M (ma, deg) |
329.580545 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.434 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.434 |
| n |
6.000 |
| gf |
0.984 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.814 |
| 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) |
| 2026-02-03 00:00 |
14:23:43.82 |
-18:04:39.7 |
HIP 70437 |
11.93 |
| 2026-02-03 12:00 |
14:23:50.08 |
-18:06:11.9 |
HIP 70437 |
10.37 |
| 2026-02-04 00:00 |
14:23:56.14 |
-18:07:43.4 |
HIP 70437 |
9.10 |
| 2026-02-04 12:00 |
14:24:01.99 |
-18:09:14.1 |
HIP 70437 |
8.21 |
| 2026-02-05 00:00 |
14:24:07.63 |
-18:10:43.9 |
HIP 70437 |
7.81 |
| 2026-02-05 12:00 |
14:24:13.07 |
-18:12:13.0 |
HIP 70437 |
7.94 |
| 2026-02-06 00:00 |
14:24:18.30 |
-18:13:41.2 |
HIP 70437 |
8.54 |
| 2026-02-06 12:00 |
14:24:23.32 |
-18:15:08.6 |
HIP 70437 |
9.50 |
| 2026-02-07 00:00 |
14:24:28.13 |
-18:16:35.2 |
HIP 70437 |
10.69 |
| 2026-02-07 12:00 |
14:24:32.73 |
-18:18:00.9 |
HIP 70437 |
12.04 |
| 2026-02-08 00:00 |
14:24:37.11 |
-18:19:25.8 |
HIP 70437 |
13.48 |
| 2026-02-08 12:00 |
14:24:41.29 |
-18:20:49.9 |
HIP 70437 |
14.97 |
| 2026-02-09 00:00 |
14:24:45.25 |
-18:22:13.1 |
HIP 70437 |
16.47 |
| 2026-02-09 12:00 |
14:24:48.99 |
-18:23:35.5 |
HIP 70437 |
17.99 |
| 2026-02-10 00:00 |
14:24:52.52 |
-18:24:56.9 |
HIP 70437 |
19.49 |
| 2026-02-10 12:00 |
14:24:55.83 |
-18:26:17.6 |
HIP 70437 |
20.99 |
| 2026-02-11 00:00 |
14:24:58.92 |
-18:27:37.3 |
HIP 70437 |
22.46 |
| 2026-02-11 12:00 |
14:25:01.80 |
-18:28:56.2 |
HIP 70437 |
23.91 |
| 2026-02-12 00:00 |
14:25:04.45 |
-18:30:14.2 |
HIP 70437 |
25.33 |
| 2026-02-12 12:00 |
14:25:06.88 |
-18:31:31.3 |
HIP 70437 |
26.73 |
| 2026-02-13 00:00 |
14:25:09.09 |
-18:32:47.5 |
HIP 70608 |
26.11 |
| 2026-02-13 12:00 |
14:25:11.08 |
-18:34:02.8 |
HIP 70608 |
24.96 |
| 2026-02-14 00:00 |
14:25:12.84 |
-18:35:17.2 |
HIP 70608 |
23.89 |
| 2026-02-14 12:00 |
14:25:14.38 |
-18:36:30.7 |
HIP 70608 |
22.89 |
| 2026-02-15 00:00 |
14:25:15.69 |
-18:37:43.3 |
HIP 70608 |
21.97 |
| 2026-02-15 12:00 |
14:25:16.78 |
-18:38:55.0 |
HIP 70608 |
21.15 |
| 2026-02-16 00:00 |
14:25:17.64 |
-18:40:05.7 |
HIP 70608 |
20.42 |
| 2026-02-16 12:00 |
14:25:18.28 |
-18:41:15.6 |
HIP 70608 |
19.78 |
| 2026-02-17 00:00 |
14:25:18.68 |
-18:42:24.5 |
HIP 70608 |
19.26 |
| 2026-02-17 12:00 |
14:25:18.86 |
-18:43:32.4 |
HIP 70608 |
18.85 |
| 2026-02-18 00:00 |
14:25:18.81 |
-18:44:39.4 |
HIP 70608 |
18.56 |
| 2026-02-18 12:00 |
14:25:18.52 |
-18:45:45.5 |
HIP 70608 |
18.38 |
| 2026-02-19 00:00 |
14:25:18.01 |
-18:46:50.6 |
HIP 70608 |
18.33 |
| 2026-02-19 12:00 |
14:25:17.27 |
-18:47:54.8 |
HIP 70608 |
18.40 |
| 2026-02-20 00:00 |
14:25:16.29 |
-18:48:58.0 |
HIP 70608 |
18.58 |
| 2026-02-20 12:00 |
14:25:15.09 |
-18:50:00.2 |
HIP 70608 |
18.88 |
| 2026-02-21 00:00 |
14:25:13.65 |
-18:51:01.5 |
HIP 70608 |
19.29 |
| 2026-02-21 12:00 |
14:25:11.98 |
-18:52:01.8 |
HIP 70608 |
19.80 |
| 2026-02-22 00:00 |
14:25:10.08 |
-18:53:01.1 |
HIP 70608 |
20.41 |
| 2026-02-22 12:00 |
14:25:07.95 |
-18:53:59.4 |
HIP 70608 |
21.10 |
| 2026-02-23 00:00 |
14:25:05.58 |
-18:54:56.8 |
HIP 70608 |
21.88 |
| 2026-02-23 12:00 |
14:25:02.98 |
-18:55:53.1 |
HIP 70608 |
22.73 |
| 2026-02-24 00:00 |
14:25:00.15 |
-18:56:48.5 |
HIP 70608 |
23.65 |