메타데이터
| 항목 |
값 |
| Designation |
P/2019 X2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-12-09T07:29:31.522560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:01Z |
| Obs used |
49 |
| NEO |
- |
| M1 |
18.100 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-12-04T13:53:07.584000Z |
| Discovery magnitude (MPC) |
21.60 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-12-28.0000000 |
| e |
0.49925561 |
| q (au) |
1.824131 |
| a (au) |
3.642840 |
| i (deg) |
15.881613 |
| Ω (om, deg) |
250.856818 |
| ω (w, deg) |
213.558832 |
| M (ma, deg) |
2.649128 |
밝기
산란 + 전체 선형
$$
M_a = (20.000 + 3.550\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
20.000 |
| n |
3.550 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.936 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
00:38:49.03 |
+14:19:47.3 |
HIP 3129 |
15.84 |
| 2026-03-26 12:00 |
00:39:39.90 |
+14:23:50.1 |
HIP 3129 |
11.90 |
| 2026-03-27 00:00 |
00:40:30.86 |
+14:27:53.1 |
HIP 3129 |
19.23 |
| 2026-03-27 12:00 |
00:41:21.91 |
+14:31:56.5 |
HIP 3242 |
25.22 |
| 2026-03-28 00:00 |
00:42:13.06 |
+14:36:00.2 |
HIP 3242 |
25.32 |
| 2026-03-28 12:00 |
00:43:04.29 |
+14:40:04.2 |
HIP 3409 |
26.14 |
| 2026-03-29 00:00 |
00:43:55.62 |
+14:44:08.5 |
HIP 3409 |
22.90 |
| 2026-03-29 12:00 |
00:44:47.03 |
+14:48:13.1 |
HIP 3545 |
23.00 |
| 2026-03-30 00:00 |
00:45:38.54 |
+14:52:18.0 |
HIP 3545 |
18.32 |
| 2026-03-30 12:00 |
00:46:30.14 |
+14:56:23.2 |
HIP 3545 |
22.04 |
| 2026-03-31 00:00 |
00:47:21.84 |
+15:00:28.6 |
HIP 3823 |
27.55 |
| 2026-03-31 12:00 |
00:48:13.62 |
+15:04:34.3 |
HIP 3823 |
20.21 |
| 2026-04-01 00:00 |
00:49:05.50 |
+15:08:40.2 |
HIP 3823 |
20.12 |
| 2026-04-01 12:00 |
00:49:57.47 |
+15:12:46.3 |
HIP 3931 |
17.81 |
| 2026-04-02 00:00 |
00:50:49.54 |
+15:16:52.7 |
HIP 3931 |
13.28 |
| 2026-04-02 12:00 |
00:51:41.69 |
+15:20:59.3 |
HIP 3931 |
19.62 |
| 2026-04-03 00:00 |
00:52:33.95 |
+15:25:06.1 |
HIP 4096 |
24.70 |
| 2026-04-03 12:00 |
00:53:26.29 |
+15:29:13.1 |
HIP 4096 |
31.26 |
| 2026-04-04 00:00 |
00:54:18.73 |
+15:33:20.3 |
HIP 4387 |
28.28 |
| 2026-04-04 12:00 |
00:55:11.26 |
+15:37:27.7 |
HIP 4387 |
15.09 |
| 2026-04-05 00:00 |
00:56:03.89 |
+15:41:35.3 |
HIP 4387 |
3.19 |
| 2026-04-05 12:00 |
00:56:56.61 |
+15:45:43.0 |
HIP 4387 |
12.17 |
| 2026-04-06 00:00 |
00:57:49.42 |
+15:49:50.9 |
HIP 4387 |
25.36 |
| 2026-04-06 12:00 |
00:58:42.34 |
+15:53:59.0 |
HIP 4666 |
20.36 |
| 2026-04-07 00:00 |
00:59:35.34 |
+15:58:07.2 |
HIP 4666 |
14.81 |
| 2026-04-07 12:00 |
01:00:28.44 |
+16:02:15.5 |
HIP 4666 |
19.58 |
| 2026-04-08 00:00 |
01:01:21.64 |
+16:06:23.9 |
HIP 4754 |
16.40 |
| 2026-04-08 12:00 |
01:02:14.93 |
+16:10:32.5 |
HIP 4912 |
11.50 |
| 2026-04-09 00:00 |
01:03:08.32 |
+16:14:41.1 |
HIP 4912 |
6.76 |
| 2026-04-09 12:00 |
01:04:01.81 |
+16:18:49.9 |
HIP 5075 |
13.50 |
| 2026-04-10 00:00 |
01:04:55.39 |
+16:22:58.7 |
HIP 5075 |
8.44 |
| 2026-04-10 12:00 |
01:05:49.07 |
+16:27:07.6 |
HIP 5185 |
11.52 |
| 2026-04-11 00:00 |
01:06:42.84 |
+16:31:16.6 |
HIP 5185 |
13.35 |
| 2026-04-11 12:00 |
01:07:36.72 |
+16:35:25.6 |
HIP 5185 |
24.32 |
| 2026-04-12 00:00 |
01:08:30.69 |
+16:39:34.7 |
HIP 5369 |
35.14 |
| 2026-04-12 12:00 |
01:09:24.75 |
+16:43:43.8 |
HIP 5541 |
23.98 |
| 2026-04-13 00:00 |
01:10:18.91 |
+16:47:52.9 |
HIP 5541 |
10.90 |
| 2026-04-13 12:00 |
01:11:13.17 |
+16:52:02.1 |
HIP 5541 |
5.81 |
| 2026-04-14 00:00 |
01:12:07.53 |
+16:56:11.2 |
HIP 5541 |
17.92 |
| 2026-04-14 12:00 |
01:13:01.99 |
+17:00:20.3 |
HIP 5541 |
31.34 |
| 2026-04-15 00:00 |
01:13:56.54 |
+17:04:29.5 |
HIP 5763 |
34.82 |
| 2026-04-15 12:00 |
01:14:51.19 |
+17:08:38.5 |
HIP 5930 |
27.32 |
| 2026-04-16 00:00 |
01:15:45.94 |
+17:12:47.6 |
HIP 5930 |
24.04 |