메타데이터
| 항목 |
값 |
| Designation |
C/2021 O1 (Nishimura) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-08-13T22:16:11.570880Z |
| Orbit solution date (soln_date, UTC) |
2023-04-24T19:06:44Z |
| Obs used |
59 |
| NEO |
- |
| M1 |
10.800 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-07-21T18:47:36.384000Z |
| Discovery magnitude (MPC) |
10.70 T |
| Discovery observatory (MPC) |
247 · Roving Observer |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-07-26.0000000 |
| e |
1.00305367 |
| q (au) |
0.787409 |
| a (au) |
-257.856271 |
| i (deg) |
27.567888 |
| Ω (om, deg) |
41.631614 |
| ω (w, deg) |
74.438198 |
| M (ma, deg) |
-0.004505 |
밝기
산란 + 전체 선형
$$
M_a = (9.855 + 3.673\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.855 |
| n |
3.673 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
17:58:34.49 |
-43:33:20.7 |
HIP 87962 |
10.32 |
| 2026-03-26 12:00 |
17:58:34.21 |
-43:34:04.9 |
HIP 87962 |
10.95 |
| 2026-03-27 00:00 |
17:58:33.84 |
-43:34:49.0 |
HIP 87962 |
11.58 |
| 2026-03-27 12:00 |
17:58:33.37 |
-43:35:33.2 |
HIP 87962 |
12.21 |
| 2026-03-28 00:00 |
17:58:32.80 |
-43:36:17.4 |
HIP 87962 |
12.85 |
| 2026-03-28 12:00 |
17:58:32.14 |
-43:37:01.5 |
HIP 87962 |
13.49 |
| 2026-03-29 00:00 |
17:58:31.38 |
-43:37:45.6 |
HIP 87962 |
14.14 |
| 2026-03-29 12:00 |
17:58:30.53 |
-43:38:29.7 |
HIP 87962 |
14.79 |
| 2026-03-30 00:00 |
17:58:29.59 |
-43:39:13.8 |
HIP 87962 |
15.45 |
| 2026-03-30 12:00 |
17:58:28.55 |
-43:39:57.8 |
HIP 87962 |
16.10 |
| 2026-03-31 00:00 |
17:58:27.41 |
-43:40:41.8 |
HIP 87962 |
16.77 |
| 2026-03-31 12:00 |
17:58:26.18 |
-43:41:25.7 |
HIP 87962 |
17.43 |
| 2026-04-01 00:00 |
17:58:24.86 |
-43:42:09.6 |
HIP 87962 |
18.11 |
| 2026-04-01 12:00 |
17:58:23.44 |
-43:42:53.5 |
HIP 87962 |
18.78 |
| 2026-04-02 00:00 |
17:58:21.92 |
-43:43:37.3 |
HIP 87962 |
19.46 |
| 2026-04-02 12:00 |
17:58:20.32 |
-43:44:21.1 |
HIP 87962 |
20.14 |
| 2026-04-03 00:00 |
17:58:18.61 |
-43:45:04.8 |
HIP 87962 |
20.83 |
| 2026-04-03 12:00 |
17:58:16.82 |
-43:45:48.4 |
HIP 87962 |
21.52 |
| 2026-04-04 00:00 |
17:58:14.93 |
-43:46:32.0 |
HIP 87962 |
22.22 |
| 2026-04-04 12:00 |
17:58:12.94 |
-43:47:15.5 |
HIP 87962 |
22.92 |
| 2026-04-05 00:00 |
17:58:10.86 |
-43:47:59.0 |
HIP 87962 |
23.63 |
| 2026-04-05 12:00 |
17:58:08.69 |
-43:48:42.3 |
HIP 87962 |
24.34 |
| 2026-04-06 00:00 |
17:58:06.42 |
-43:49:25.6 |
HIP 87962 |
25.06 |
| 2026-04-06 12:00 |
17:58:04.05 |
-43:50:08.9 |
HIP 87962 |
25.78 |
| 2026-04-07 00:00 |
17:58:01.60 |
-43:50:52.0 |
HIP 87962 |
26.51 |
| 2026-04-07 12:00 |
17:57:59.05 |
-43:51:35.1 |
HIP 87962 |
27.25 |
| 2026-04-08 00:00 |
17:57:56.40 |
-43:52:18.0 |
HIP 87962 |
27.99 |
| 2026-04-08 12:00 |
17:57:53.67 |
-43:53:00.9 |
HIP 87962 |
28.74 |
| 2026-04-09 00:00 |
17:57:50.83 |
-43:53:43.7 |
HIP 87846 |
29.12 |
| 2026-04-09 12:00 |
17:57:47.91 |
-43:54:26.4 |
HIP 87846 |
28.26 |
| 2026-04-10 00:00 |
17:57:44.89 |
-43:55:08.9 |
HIP 87846 |
27.40 |
| 2026-04-10 12:00 |
17:57:41.78 |
-43:55:51.4 |
HIP 87846 |
26.53 |
| 2026-04-11 00:00 |
17:57:38.58 |
-43:56:33.8 |
HIP 87846 |
25.67 |
| 2026-04-11 12:00 |
17:57:35.28 |
-43:57:16.0 |
HIP 87846 |
24.80 |
| 2026-04-12 00:00 |
17:57:31.89 |
-43:57:58.1 |
HIP 87846 |
23.93 |
| 2026-04-12 12:00 |
17:57:28.40 |
-43:58:40.1 |
HIP 87846 |
23.07 |
| 2026-04-13 00:00 |
17:57:24.83 |
-43:59:22.0 |
HIP 87846 |
22.20 |
| 2026-04-13 12:00 |
17:57:21.16 |
-44:00:03.7 |
HIP 87846 |
21.34 |
| 2026-04-14 00:00 |
17:57:17.40 |
-44:00:45.4 |
HIP 87846 |
20.49 |
| 2026-04-14 12:00 |
17:57:13.55 |
-44:01:26.8 |
HIP 87846 |
19.65 |
| 2026-04-15 00:00 |
17:57:09.61 |
-44:02:08.2 |
HIP 87846 |
18.82 |
| 2026-04-15 12:00 |
17:57:05.58 |
-44:02:49.4 |
HIP 87846 |
18.01 |
| 2026-04-16 00:00 |
17:57:01.45 |
-44:03:30.4 |
HIP 87846 |
17.21 |