메타데이터
| 항목 |
값 |
| Designation |
C/2022 D2 (Kowalski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-03-27T13:51:54.040320Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:31Z |
| Obs used |
112 |
| NEO |
- |
| M1 |
14.100 |
| K1 |
25.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-02-25T02:54:45.244800Z |
| Discovery magnitude (MPC) |
19.85 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2022-03-11.0000000 |
| e |
0.99563301 |
| q (au) |
1.555140 |
| a (au) |
356.112305 |
| i (deg) |
22.654502 |
| Ω (om, deg) |
312.470402 |
| ω (w, deg) |
177.792237 |
| M (ma, deg) |
359.997569 |
밝기
산란 + 전체 선형
$$
M_a = (15.407 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.407 |
| n |
6.000 |
| 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 |
18:32:29.26 |
-38:25:57.9 |
HIP 90792 |
15.84 |
| 2026-03-26 12:00 |
18:32:31.09 |
-38:26:27.2 |
HIP 90792 |
15.90 |
| 2026-03-27 00:00 |
18:32:32.83 |
-38:26:56.7 |
HIP 90792 |
15.96 |
| 2026-03-27 12:00 |
18:32:34.46 |
-38:27:26.3 |
HIP 90792 |
16.03 |
| 2026-03-28 00:00 |
18:32:35.99 |
-38:27:55.9 |
HIP 90792 |
16.10 |
| 2026-03-28 12:00 |
18:32:37.43 |
-38:28:25.7 |
HIP 90792 |
16.17 |
| 2026-03-29 00:00 |
18:32:38.76 |
-38:28:55.5 |
HIP 90792 |
16.24 |
| 2026-03-29 12:00 |
18:32:39.99 |
-38:29:25.5 |
HIP 90969 |
16.14 |
| 2026-03-30 00:00 |
18:32:41.12 |
-38:29:55.5 |
HIP 90969 |
15.60 |
| 2026-03-30 12:00 |
18:32:42.15 |
-38:30:25.5 |
HIP 90969 |
15.07 |
| 2026-03-31 00:00 |
18:32:43.08 |
-38:30:55.7 |
HIP 90969 |
14.55 |
| 2026-03-31 12:00 |
18:32:43.90 |
-38:31:25.9 |
HIP 90969 |
14.04 |
| 2026-04-01 00:00 |
18:32:44.63 |
-38:31:56.3 |
HIP 90969 |
13.54 |
| 2026-04-01 12:00 |
18:32:45.25 |
-38:32:26.6 |
HIP 90969 |
13.05 |
| 2026-04-02 00:00 |
18:32:45.77 |
-38:32:57.1 |
HIP 90969 |
12.57 |
| 2026-04-02 12:00 |
18:32:46.20 |
-38:33:27.6 |
HIP 90969 |
12.11 |
| 2026-04-03 00:00 |
18:32:46.51 |
-38:33:58.2 |
HIP 90969 |
11.67 |
| 2026-04-03 12:00 |
18:32:46.73 |
-38:34:28.8 |
HIP 90969 |
11.24 |
| 2026-04-04 00:00 |
18:32:46.85 |
-38:34:59.5 |
HIP 90969 |
10.84 |
| 2026-04-04 12:00 |
18:32:46.86 |
-38:35:30.2 |
HIP 90969 |
10.45 |
| 2026-04-05 00:00 |
18:32:46.78 |
-38:36:01.0 |
HIP 90969 |
10.09 |
| 2026-04-05 12:00 |
18:32:46.59 |
-38:36:31.9 |
HIP 90969 |
9.76 |
| 2026-04-06 00:00 |
18:32:46.30 |
-38:37:02.8 |
HIP 90969 |
9.46 |
| 2026-04-06 12:00 |
18:32:45.91 |
-38:37:33.7 |
HIP 90969 |
9.19 |
| 2026-04-07 00:00 |
18:32:45.41 |
-38:38:04.7 |
HIP 90969 |
8.96 |
| 2026-04-07 12:00 |
18:32:44.81 |
-38:38:35.7 |
HIP 90969 |
8.77 |
| 2026-04-08 00:00 |
18:32:44.12 |
-38:39:06.8 |
HIP 90969 |
8.63 |
| 2026-04-08 12:00 |
18:32:43.31 |
-38:39:37.9 |
HIP 90969 |
8.54 |
| 2026-04-09 00:00 |
18:32:42.41 |
-38:40:09.0 |
HIP 90969 |
8.50 |
| 2026-04-09 12:00 |
18:32:41.41 |
-38:40:40.1 |
HIP 90969 |
8.52 |
| 2026-04-10 00:00 |
18:32:40.30 |
-38:41:11.3 |
HIP 90969 |
8.59 |
| 2026-04-10 12:00 |
18:32:39.09 |
-38:41:42.5 |
HIP 90969 |
8.71 |
| 2026-04-11 00:00 |
18:32:37.78 |
-38:42:13.7 |
HIP 90969 |
8.89 |
| 2026-04-11 12:00 |
18:32:36.37 |
-38:42:44.9 |
HIP 90969 |
9.12 |
| 2026-04-12 00:00 |
18:32:34.85 |
-38:43:16.1 |
HIP 90969 |
9.41 |
| 2026-04-12 12:00 |
18:32:33.24 |
-38:43:47.3 |
HIP 90968 |
9.73 |
| 2026-04-13 00:00 |
18:32:31.52 |
-38:44:18.6 |
HIP 90968 |
10.09 |
| 2026-04-13 12:00 |
18:32:29.70 |
-38:44:49.8 |
HIP 90968 |
10.50 |
| 2026-04-14 00:00 |
18:32:27.77 |
-38:45:21.1 |
HIP 90968 |
10.94 |
| 2026-04-14 12:00 |
18:32:25.75 |
-38:45:52.3 |
HIP 90968 |
11.43 |
| 2026-04-15 00:00 |
18:32:23.62 |
-38:46:23.5 |
HIP 90968 |
11.94 |
| 2026-04-15 12:00 |
18:32:21.40 |
-38:46:54.7 |
HIP 90968 |
12.50 |
| 2026-04-16 00:00 |
18:32:19.07 |
-38:47:25.9 |
HIP 90968 |
13.08 |