메타데이터
| 항목 |
값 |
| Designation |
C/2020 R6 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-09-09T23:50:03.036480Z |
| Orbit solution date (soln_date, UTC) |
2021-12-17T03:12:50Z |
| Obs used |
56 |
| NEO |
- |
| M1 |
14.800 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-09-15T10:08:55.968000Z |
| Discovery magnitude (MPC) |
20.20 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-08-21.0000000 |
| e |
0.99221066 |
| q (au) |
3.129707 |
| a (au) |
401.793824 |
| i (deg) |
82.814904 |
| Ω (om, deg) |
12.177097 |
| ω (w, deg) |
272.005055 |
| M (ma, deg) |
0.042343 |
밝기
산란 + 전체 선형
$$
M_a = (17.617 + 2.630\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.617 |
| n |
2.630 |
| gf |
1.000 |
| gb |
-0.821 |
| k |
0.800 |
| δ90 |
9.998 |
| 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 |
23:48:29.96 |
+42:17:02.6 |
HIP 117421 |
5.47 |
| 2026-03-26 12:00 |
23:48:37.69 |
+42:17:55.1 |
HIP 117421 |
6.35 |
| 2026-03-27 00:00 |
23:48:45.40 |
+42:18:48.0 |
HIP 117421 |
7.52 |
| 2026-03-27 12:00 |
23:48:53.10 |
+42:19:41.5 |
HIP 117421 |
8.85 |
| 2026-03-28 00:00 |
23:49:00.79 |
+42:20:35.5 |
HIP 117421 |
10.30 |
| 2026-03-28 12:00 |
23:49:08.47 |
+42:21:30.0 |
HIP 117421 |
11.81 |
| 2026-03-29 00:00 |
23:49:16.13 |
+42:22:24.9 |
HIP 117421 |
13.37 |
| 2026-03-29 12:00 |
23:49:23.78 |
+42:23:20.3 |
HIP 117421 |
14.96 |
| 2026-03-30 00:00 |
23:49:31.42 |
+42:24:16.2 |
HIP 117421 |
16.57 |
| 2026-03-30 12:00 |
23:49:39.04 |
+42:25:12.6 |
HIP 117421 |
18.21 |
| 2026-03-31 00:00 |
23:49:46.65 |
+42:26:09.4 |
HIP 117421 |
19.85 |
| 2026-03-31 12:00 |
23:49:54.24 |
+42:27:06.7 |
HIP 117421 |
21.51 |
| 2026-04-01 00:00 |
23:50:01.82 |
+42:28:04.5 |
HIP 117421 |
23.18 |
| 2026-04-01 12:00 |
23:50:09.38 |
+42:29:02.7 |
HIP 117421 |
24.85 |
| 2026-04-02 00:00 |
23:50:16.93 |
+42:30:01.4 |
HIP 117421 |
26.53 |
| 2026-04-02 12:00 |
23:50:24.46 |
+42:31:00.5 |
HIP 117421 |
28.21 |
| 2026-04-03 00:00 |
23:50:31.97 |
+42:32:00.1 |
HIP 117672 |
26.84 |
| 2026-04-03 12:00 |
23:50:39.46 |
+42:33:00.1 |
HIP 117672 |
25.26 |
| 2026-04-04 00:00 |
23:50:46.94 |
+42:34:00.6 |
HIP 117672 |
23.69 |
| 2026-04-04 12:00 |
23:50:54.39 |
+42:35:01.6 |
HIP 117672 |
22.14 |
| 2026-04-05 00:00 |
23:51:01.83 |
+42:36:02.9 |
HIP 117672 |
20.61 |
| 2026-04-05 12:00 |
23:51:09.25 |
+42:37:04.8 |
HIP 117672 |
19.10 |
| 2026-04-06 00:00 |
23:51:16.65 |
+42:38:07.0 |
HIP 117672 |
17.63 |
| 2026-04-06 12:00 |
23:51:24.03 |
+42:39:09.7 |
HIP 117672 |
16.20 |
| 2026-04-07 00:00 |
23:51:31.38 |
+42:40:12.8 |
HIP 117672 |
14.81 |
| 2026-04-07 12:00 |
23:51:38.72 |
+42:41:16.4 |
HIP 117672 |
13.50 |
| 2026-04-08 00:00 |
23:51:46.03 |
+42:42:20.4 |
HIP 117672 |
12.28 |
| 2026-04-08 12:00 |
23:51:53.33 |
+42:43:24.7 |
HIP 117672 |
11.19 |
| 2026-04-09 00:00 |
23:52:00.60 |
+42:44:29.6 |
HIP 117672 |
10.25 |
| 2026-04-09 12:00 |
23:52:07.84 |
+42:45:34.8 |
HIP 117672 |
9.53 |
| 2026-04-10 00:00 |
23:52:15.06 |
+42:46:40.4 |
HIP 117672 |
9.07 |
| 2026-04-10 12:00 |
23:52:22.26 |
+42:47:46.5 |
HIP 117759 |
8.49 |
| 2026-04-11 00:00 |
23:52:29.44 |
+42:48:53.0 |
HIP 117759 |
6.80 |
| 2026-04-11 12:00 |
23:52:36.59 |
+42:49:59.8 |
HIP 117759 |
5.11 |
| 2026-04-12 00:00 |
23:52:43.71 |
+42:51:07.1 |
HIP 117759 |
3.47 |
| 2026-04-12 12:00 |
23:52:50.81 |
+42:52:14.8 |
HIP 117759 |
1.95 |
| 2026-04-13 00:00 |
23:52:57.88 |
+42:53:22.8 |
HIP 117759 |
1.22 |
| 2026-04-13 12:00 |
23:53:04.93 |
+42:54:31.3 |
HIP 117759 |
2.25 |
| 2026-04-14 00:00 |
23:53:11.94 |
+42:55:40.1 |
HIP 117759 |
3.82 |
| 2026-04-14 12:00 |
23:53:18.93 |
+42:56:49.4 |
HIP 117759 |
5.48 |
| 2026-04-15 00:00 |
23:53:25.89 |
+42:57:59.0 |
HIP 117759 |
7.16 |
| 2026-04-15 12:00 |
23:53:32.83 |
+42:59:09.0 |
HIP 117759 |
8.86 |
| 2026-04-16 00:00 |
23:53:39.73 |
+43:00:19.3 |
HIP 117759 |
10.57 |